Scientific Program

Conference Series Ltd invites all the participants across the globe to attend 4th International Conference on Geology and Geoscience Dubai, UAE.

Day 2 :

Keynote Forum

Osman Abdelghany

United Arab Emirates University, UAE

Keynote: A short journey through the geology of the United Arab Emirates from Cambrian period to present

Time : 10:00-10:30

Conference Series Geology and Geoscience Summit 2017 International Conference Keynote Speaker Osman Abdelghany photo
Biography:

Osman Abdelghany completed his BSc in Geology with honors and MSc in Stratigraphy and Micropaleontology from Ain Shams University, Cairo, Egypt respectively. He obtained his PhD in 1996 from Vienna University, Austria. He is currently Associate Professor of Stratigraphy and Micropaleontology at United Arab Emirates University. His Society affiliations include the ESG, GSA, GSE, ESP and ENHG. He is particularly interested in Cretaceous/Tertiary stratigraphy and microfossils and published many papers in national and international magazines.

Abstract:

The United Arab Emirates is located at the northeastern end of the Arabian Plate - a fragment of continental crust that separated 25 million years ago from the northern part of Gondwanaland at the time of the Red Sea opening. Four linear tectonic features outline the Arabian Plate. These are: 1) the Red Sea rift in the west, 2) the Dead Sea transform in the northwest, 3) the Alpine collision zone extending from the north, along the Zagros thrust belt and the Oman Mountains in the east and southeast, and 4) the transform faults associated with the Owen Fracture Zone in the south. The Arabian Plate has remained tectonically stable since the Cambrian. Cambrian rocks are exposed in the north of the Oman Mountain (Musandam Area), at Jabal Ali area in Dubai, at Jabal Al Dhanna area in Abu Dhabi, and on offshore islands, such as Sir BaniYas and Sir Bu Nouair, which are cored by salt domes. Dolomite, minor evaporites and clastics were deposited from Permian to Triassic times. In the Jurassic, shallow marine limestones, subordinate dolomites and massive anhydrites were deposited. Shallow marine limestones and clastics were deposited during the Late Cretaceous. In the Late Cretaceous, ocean floor deposits and ophiolite slices were thrusted onto the eastern side of the Afro-Arabian continental margin. The Semail Ophiolite nappe in the Oman Mountains represents the largest and best exposed section of ancient oceanic lithosphere and upper mantle in the world (more than 450 km in length and about 100 km in width). It was emplaced onto the Arabian continental margin during Early Coniacian to Late Campanian times ~ 75 Myra. In the early Tertiary, shallow marine limestones with minor gypsum and anhydrite were deposited. During the late Tertiary, clastics and minor limestones were deposited. Sand dunes (desert areas), sabkhas (coastal areas) and fluvial sediments (mountain flanks) constitute the Quaternary deposits.

  • Track 4: Engineering Geology Track 6: Geology and Civil Engineering Track 7: Exploration Geophysics Track 8: Mining Geology Track 9: Economic Geology Track 12: Remote Sensing and GIS
Speaker

Chair

Atef Abdullah Abdelhady

British University in Egypt, Egypt

Speaker

Co-Chair

Mahmoud Abu Saima

United Arab Emirates University, UAE

Session Introduction

Atef Abdullah Abdelhady

British University in Egypt, Egypt

Title: Influence of clay content on surfactant-polymer flooding for an Egyptian oil field

Time : 10:30-10:55

Speaker
Biography:

Atef Abdullah Abdelhady is an Academic Staff in Petroleum Department in British University in Egypt. He was an Operations Manager in BP/Gupco Company. He holds a Bachelor’s and Master’s degree in Enhanced Oil Recovery by Chemical Water Flooding. He holds a PhD degree in the specialty of Petroleum Production Engineering. He has 24 years of field operation experience for all activities associated with processing of oil and gas onshore and offshore locations. He is an SPE active member for more than 27 years. During his career, he has authored several technical papers in Egypt and USA. He has been selected as a qualified candidate for inclusion in the 1998 edition of International Who’s Who Membership. He has training skills and experience inside and outside Egypt. 

Abstract:

Oil recovery after water flood, by surfactant-polymer flooding at different percentages of clay content, has been studied for July oil field. Formation water (72000 ppm) and crude oil of the July field have been used; the study was performed on Mesh to represent the porous field. Bentonite, colloidal sand packs media of clay from Wyoming Company, dispersion into USA, has been used as sand-packs. Dowell EZEFLO and polyacrylamide were used. This study concentrates on clay surfactant, F-75, this study effect of sur-in the various percentages of clay content (0%, 3.5%, 5%, tertiary oil 10%, 15% and 20%) on recovery. The effect of secondary and of surfactant concentration on tertiary oil recovery at the mentioned clay content values has been also studied to determine the maximum ultimate oil recovery for each case. The experimental results show that, the major factor affecting tertiary oil recovery by surfactant-polymer method is the surfactant concentration; the recovery is improved as the concentration increased; for any clay content, as the surfactant concentration increases the oil production starts sooner (earlier breakthrough) and sustains at higher level; for clay content less than 10 % it is more efficient to use a large pore volume of surfactant slug  with low concentration; for oil value of clay content more than 15%, the recovery increases with increasing surfactant concentration up to the value of 4% and after that, the recovery decreases. Thus this value (4%) is taken as the optimum value of surfactant concentration in this case and for any slug concentration, as the clay content increases, the oil breakthrough is delayed.

Speaker
Biography:

A Geetha Selvarani has completed her PhD from Anna University, Chennai. She has published more than 35 papers in reputed journals and conferences and has been serving as an Editorial Board Member and reviewer for various reputed journals. She has published five books with ISBN number and filed two patents. She participated as Invited Speaker and Chair Person for the 5th International Conference on Civil Engineering and Urban Planning (CEUP 2016) held in Xian, China during 23rd to 26th, August 2016. She is a member in Technical Program Committee for “International Conference on Geomatics and Civil Engineering [GCE2017]”, which will be held during September 8th - 10th, 2017, Shanghai, China.

Abstract:

The water is a nature’s valuable gift to all life forms. Depending upon the quality and quantity of groundwater it can be used for various purposes, such as drinking, agricultural and industrial uses. Due to revolution in industries and various anthropogenic sources in the past decades, groundwater has been polluted and depleted. Remote sensing and Geographical Information System (GIS) has become one of the leading tools in the field of hydrogeological science, which helps in assessing, monitoring and conserving groundwater resources. GIS technology provides suitable alternatives for efficient management of large and complex databases. In recent years, the increasing use of satellite remote sensing data has made it easier to define the spatial distribution of different groundwater prospect classes on the basis of geomorphology and other associated parameters. Analysis of remotely sensed data along with topographical sheets and collateral information with necessary field checks helps in generating the base line information for groundwater exploration and non-natural (artificial). The groundwater exploration and Non-Natural recharge sites were identified by integrating thematic maps of geology, geomorphology, slope, drainage density and lineament density of the study area. The weights of different parameters/themes were computed using weighed index overlay analysis (WIOA), analytic hierarchy process (AHP) and fuzzy logic technique. Through this integrated GIS analysis, groundwater prospect map non-natural recharge sites map of the study area was prepared qualitatively. Field verification at observation wells was used to verify identified potential zones and depth of water measured at observation wells. Generated map from weighed overlay using AHP performed very well in predicting the groundwater surface and hence this methodology proves to be a promising tool for future.

Speaker
Biography:

M G Thakkar is working on neotectonics, paleoseismology, paleoclimates and quaternary science of Kachchh intra-plate basin in western India since 25 years. He worked as an Assistant Professor in an undergraduate college in Bhuj. He also worked efficiently and effectively as a Principal in the same college for two years and received NAAC accreditation. From 2008 onwards, he established a new Department of Earth and Environmental Science in KSKV Kachchh University and became the Associate Professor and Head. Simultaneously, he also acted as a Dean-Science Faculty and is still working with the same designation. He became a Professor. He has received several research awards/grants from the Government of India, ministry of science and Technology and published ~50 national and international research papers in peer reviewed journals till date. He has also attended and convened several international conferences during his career.

Abstract:

Kachchh is a pericratonic rift basin, traversed by E-W trending faults viz. Nagar Parkar Fault, Island Belt Fault, Kachchh Mainland Fault, South Wagad Fault, Katrol Hill Fault and North Kathiyawar Fault. These make the half-graben structures bounded by uplifts. Transverse faults trending N-S, NW-SE to NE-SW cut across the E-W tectonic fabric in dip-slip and strike slip manners. Central part of the Kachchh basin is affected by basement high known as Median high trending NNE-SSW. Neotectonics along the median high causes structural bending developing several N-S, NNW-SSE, NNE-SSW transverse faults, which form in the network of the law amplitude but extensive faults. The mainland is geographically divided into northern hill range and Katrol hill range flanked by the major faults. At places KMF and KHF are dissected by transverse faults of varying trends. Most transverse faults are caused by the structural bending of Median high. University fault, Ratiya Fault and Kodki faults are low amplitude faults developed as bending fractures on the crest of the Median High. These show geometry of normal, reserve and strike slip movement in the field. N-S trending Kodki fault shows normal nature forming graben and half-Graben structures, while NNE-SSW trending University fault is reverse forming a small scarp. Ratiya fault is oblique slip in nature evidenced by drainage offsetting and alluvial fan and debris deposits on the hanging wall, above the fault plane. Presently studied varied (normal, reverse and oblique slip) transverse faults are restricted to the Median High region between two major E-W trending reverse faults suggesting N-S and E-W compressive stresses. The studies suggest that in neotectonic movement in median high of Kachchh mainland has generated varied transverse faults due to multiple stress regimes during inversion phase. It needs detailed geodetic and structural analysis to know the sources of these tectonic forces.

Hooshang Asadi Haroni

Isfahan University of Technology, Iran

Title: The discovery of the Kahang porphyry copper deposit in Iran

Time : 12:00-12:25

Speaker
Biography:

Hooshang Asadi Haroni holds degrees in Geology (BSc in National Iranian University, Tehran, Mineral Exploration (MSc in Faculty of Geo-Information Science and Earth Observation, ITC, The Netherlands) and also Mineral Exploration (PhD, Centre for Technical Geosciences, Delft University of Technology, Netherlands). He worked as Exploration Geologist and GIS Database Analyst at the international mining company of “Rio Tinto Mining and Exploration Limited. He worked an Assistant Professor in the Mining Engineering department of Isfahan University of Technology in Iran. In addition, he is appointed as Adjunct Senior Researcher in the Centre for Exploration targeting (CET), University of Western Australia (UWA). 

Abstract:

The Kahang porphyry copper deposit is located in the central part of Urumieh-Dokhtar Magmatic Arc (UDMA) segment of the Tethyan metallogenic belt in Iran. The giant Sar-Chesmeh and Sungun porphyry Cu deposits are also located along this arc. The Kahang deposit consists of three porphyry centers that crop out in an E-W trending direction (Afzal, 2009). During the reconnaissance stage by Rio Tinto in 2003, the first porphyry center was identified by mapping hydrothermal alteration using TM satellite data and ground control. In 2004 during the prospecting stage, an Iranian company (DORSA) re-evaluated the Kahang occurrence and successfully identified a 7.5×3.5 km zone of hydrothermal alteration using ASTER satellite data (Figure 1). Disseminated Cu mineralization is associated with plutons of quartz diorite showing potassic and phyllic alteration comprising magmatic K-feldspar, secondary biotite and well-developed quartz-sericite surrounded by barren argillic and extensive propyllitic alteration. In normalized multielement diagrams, Kahang host intrusions are characterized by enrichments in large ion lithophile elements and depletions in high field strength elements, and display features typical of subduction-related calc-alkaline magmas. In 2005, DORSA by applying an additive index analysis on the soil geochemical data, three Cu-Mo anomalies were identified. A reduced to the pole magnetic map revealed strong negative magnetic anomalies at these centers. An IP/RS survey was also carried out at these centers; this information was combined with the earlier exploration data to generate drill targets tested by 18 deep holes. Most of these holes intersected several zones of economic Cu mineralization, mostly from 180 m to 456 m, and the project was upgraded to systematic drilling. In 2008, the Kahang deposit was transferred to the National Iranian Copper Industry Company (NICICO) and then in total about 45000 m drilling was carried out at Kahang to calculate a proved reserve of 110@0.45% Cu just at East Kahan porphyry center. 

Speaker
Biography:

Jarot Setyowiyoto is a Lecturer for Undergraduate and Postgraduate courses in the Department of Geological Engineering, Gadjah Mada University, Yogyakarta, Indonesia. His teaching experience is in the areas of Petroleum Geology, Subsurface Geology, Petroleum Geochemistry, Well Log Analysis/Formation Evaluation, Reservoir Engineering, Organic Petrology, and Unconventional Resources (Coal Bed Methane, Shale Gas, Tight Sand Gas). He is also an Oil and Gas Researcher in Depatrment of Geological Engineering, Gadjah Mada University, Yogyakarta, Indonesia.

Abstract:

This research took place at an off-shore oil field in Soka Field, North-west Indonesia Basin, Riau Islands Province approximately 300 km west of Natuna Island which covers the area of 1.320 km2. It aims to determine lithology facies and sedimentation environment which lead to distribution, thickness, and the geometry of prospect reservoir. Well log, core, and seismic 2D, as main data of this research, are combined and integrated. Additional data like thin-section and drill stem test (DST) data are also used as well. There are 2 prospect Oligo-Miocene reservoirs found in this area of study which potentially become drilling target. Specifically, those reservoirs are Late Oligocene Reservoir Zone A (A1, A2, A3) and Early Miocene Reservoir Zone B. Reservoirs Zone A and B are parts of mixed flats and tidal sand bar facies in tidal flats sedimentation environment. It is concluded by the presence of typical tidal activity sediment structures, such as lenticular, wavy, and flaser bedding. Ichnofacies Glossifungites and mineral glauconite also appear. Both reservoir zones also have a typical elongate geometry with NW-SE orientation, following development of strike-slip fault in research area. Reservoir Zone B is thicker than Reservoir Zone A, but both reservoir zones show the same pattern of thicker Northeast-ward.

Speaker
Biography:

Fatemeh Sadat Sharifi is a PhD student at Azad Islamic University of Iran working in the field of Physical Oceanography. She is interested in areas of tidal currents and waves, oceanic circulation, upwelling and down welling, fronts, seasonal monsoons and modeling.   

Abstract:

In this research, a barotropic model was used to consider the tidal studies in Persian Gulf and Oman Sea where the only effective force was the tidal force. To do that, a finite-difference, free surface model called ROMS, was employed on the data over the Persian Gulf and Oman Sea. The two places were chosen since both are one of the most important water bodies in case of economy, biology, fishery, navigation and petroleum extraction. The modeled result was validated by the OTPS tidal data and also the data gathered from some stations. Next, tidal elevation and speed, and tidal analysis were rendered.  The preliminary result shows a significant accuracy in the tidal elevation compared with the tidal stations and OTPS, revealing that tidal currents are highest in Hormuz Strait, and the narrow and shallow region between Kish Island and other Iranian coasts. Moreover, tidal analysis clears that the M2 component has the greatest value. Finally, the tidal currents entering Persian Gulf are divided into two branches: the first branch turns from south to Qatar and via United Arab Emirate returns to Hormuz Strait. The second branch, in north and west, continues up to the highest point in Persian Gulf and in the head of Gulf turns counterclockwise.

Wided Batita

Laval University, Canada

Title: Using MUSLE model and GIS to predict and estimate soil erosion

Time : 13:55-14:20

Speaker
Biography:

Wided Batita received Ingenior degree in Aquatic Resources from National Agronomic Institute of Tunis, MSc degree in Environmental Management from Mediterranean Agronomic Institute of Chania, Greece, in 2006 and 2009, respectively and the PhD degree in Geomatics from Laval University, Quebec, Canada in 2016. She has taught GIS, mapping and GIS analysis as auxiliary teaching at Laval University.She is mainly interested in issues on access and use of geospatial technologies for planning and Geodesign, VGI, risk assessment, and spatial database

Abstract:

Statement of the Problem: Soil erosion by water is recognized as a major problem arising from agricultural intensification, land degradation and possibly global climatic change. It is, in our days, a major threat to sustainable land and crop production and causes degradation of water resources. This phenomenon is leading to significant decrease of soil fertility in the Mediterranean region as well as in Europe. GIS and Remote Sensing become necessary tools to prevent further soil degradation, by assessing risk. These tools have been implemented to assess the soil erosion risk in Kolymvari, Crete, Greece, which is due to intensive olive cultivation.

Methodology & Theoretical Orientation: The main aim of this study is to monitor potential land degradation in the Kolymvari municipality, which will be achieved through Modified Universal Soil Loss Equation Model (MUSLE) that could be utilized for predicting the scale and extent of land degradation in the study area. The estimation of the peak discharge, and the runoff volume were estimated. After that, the MUSLE factors have been generated. The watershed study area has been classified into categories (5ERCs) according to the degree of erosion risk, based on the predicted soil loss potential by the model. So, the high erosion risk areas (hot spots ERC5) have been identified in the watershed and accordingly, simple and low cost conservation and management practices have been proposed.

 

Findings: The strength of MUSLE model includes its ability to directly estimate sediment delivery potential from soil erosion. This is a valuable tool for environmental management and much needed for source-sink characterization of terrestrial source and aquatic sinks of particulate matters.

Conclusion & Significance: There is no big difference between the thematic maps generated by the two models MUSLE and RUSLE, almost the same values were found for the 5 ERCs. The areas located in the northern part of the peninsula belong to ERC5, because soil erosion potential coincided with the steeper slope length (L) and steepness (S) factors. Additionally, the areas in the southern part of the area belong to ERC5, because soil erosion potential coincides with relatively intense olive cultivation.

Speaker
Biography:

Said Khouya is an undergraduate third year student at the Department of Geology, United Arab Emirates University (UAEU), UAE. His research interest includes Stratigraphy and Paleontology. This presentation is a part of his research project supported by UAEU.

Abstract:

Middle to late Eocene diagnostic planktonic foraminifera (Cribrohantkenina inflata and Hantkenina longispina) and shoal bank accumulations of benthonic (Asterocyclina pentagonalis, Discocyclina sp. and Nummulites sp.) were discovered from marls and limestones of the Dammam Formation, at Jabals Hafit, Malaqet and Mundassah in Al Ain area and Jabals Buhays and El Aqabah, El Fayiah area in the United Arab Emirates. Lithostratigraphic and biostratigraphic correlations are proposed based on fossil data. The Dammam Formation unconformably overlies nodular limestone rocks of the Rus Formation. The described fossils are highly sensitive to environmental changes, especially fluctuations in sea level. Variable sizes of pores reaching up to a few cm in diameter were observed and provide strong possibility for high permeability conditions. Such conditions make the Dammam Formation as a potential aquifer or hydrocarbon reservoir at depth.

Speaker
Biography:

Viqar Husain is the Former Chairman at Department of Geology and Dean Faculty of Science, University of Karachi. He is founder Convener SEGMITE, AGID Vice President and Chief Editor of online International Journal of Economic and Environmental Geology. After serving for about 12 years in Pakistan CSIR, he joined as Professor of Geology at University of Karachi in 1999 and currently is engaged in research and teaching Economic and Environmental Geology at University of Karachi and Federal Urdu University, Karachi. He has published over 50 research papers, supervised a number of M.Phil/Ph.D students and organized many national/international conferences.

Abstract:

The cultivable lands are reducing significantly in hot and dry arid regions of the world due to soil salinity and sodicity and resulting in yield losses. Similarly, the coastal Shah Bandar Tehsil of Thatta district is also severely affected by different levels of soil salinity and sodicity. The topography of the area is uneven, so ill drained depressions and saline creeks are common. The area was worst affected by floods of 2010 and 2011 and flood water was kept standing for several months causing waterlogging. Irrigation is done with perennial and non perennial canals in the area as groundwater is highly saline. In order to identify spatial and temporal variations in soil salinity and sodicity, 48 soil samples were collected from six sites of Shah Bandar Tehsil during post- and pre-monsoon seasons of 2011-2013. Physicochemical data show that average pH of soil ranged between 7.4 and 7.8 during post- and pre-monsoon seasons of 2011-2013 and the soil salinity (ECe) and sodicity (SAR) ranged between 1.09 to 47.10 dS/m and 2.43 to 43.79 respectively during post-monsoon seasons. During pre-monsoon seasons, EC and SAR ranged from 2.30 to 65.8 dS/m and 3.12 to 50.51 respectively. Thus, soil salinity and sodicity vary in post- and pre-monsoon seasons due to arid climate, high evapotranspiration and fallow lands due to reduced flow of freshwater and seawater intrusion in the area. Data show that the soil quality improved significantly in areas affected with floods of 2010 and 2011.

Seema Naz Siddiqui

The Federal Urdu University of Arts, Science & Technology, Pakistan

Title: Economic potential and coal mining hazards in the Lakhra Area, Sindh, Pakistan

Time : 15:10-15:35

Speaker
Biography:

Seema Naz Siddique is the Chairperson of Department of Geology, Federal Urdu University of Arts, Science and Technology, Karachi, with about 25 years of teaching and research experience. She served as Lecturer in Department of Soil Science, Baluchistan Agriculture College, Quetta during 1990-1993. In 1993 she joined Department of Geology, Federal Urdu College which became Federal Urdu University, of Arts, Science and Technology, Karachi in 2002 where she is serving as senior faculty member. 

Abstract:

Lakhra coal field covering an area of about 100 sq. km is located 35 km northwest of Hyderabad city between latitudes 25-32-45 N and longitudes 68-O-15 E. The coal beds occur on the Lakhra anticline in the lower part of the Ranikot Formation belonging to Paleocene age. The thickness of coal seams varies between 1.5 to 3.5 meters (Avg. 1 meter) at 15-25 meters depth with estimated reserves of about 240 million tons. The coal is subbituminous and lignite in rank, classed as medium to high ash and high sulfur grades. About two dozens of small private mining units are engaged in exploiting coal from Lakhra without using underground machinery. The coal is produced by hand tools causing health hazards to the mine workers. Unscientific mining methods are also causing damage to the coal resources of Lakhra, as open pits are abandoned after excavating upper coal seams lying at shallower depth, leaving unexploited two other coal beds occurring at deeper levels in the area. Recent exploration studies by electrical resistivity method reveal new coal deposits in the vicinity of Lakhra coalfield. This paper discusses the economic potential of Lakhra and other coalfields in the area, as their easy accessibility ensure large scale utilization of coal. The skilled mine workers engaged in coal open pit mining are often facing serious health and safety problems due to poor working and living conditions in the area. The environmental hazards for miners and mitigation measures are also part of the present study. 

Speaker
Biography:

Nicola Capuano is the Professor of Geology, Regional Geology and Sedimentology. His research areas include geological and structural surveys of the Marches North, study lithostratigraphic and sedimentological of syn-orogenic basins, sedimentological analysis of the Messinian evaporite deposits of the Marche-Romagna, correlation and nomenclature of lithostratigraphic and tectonic units of the Members of the Marnoso-Arenacea outcropping in the Marche and Romagna sector and tectonic and sedimentary evolution of the Apennine foredeep turbidite deposits.

Abstract:

This work discusses the synsedimentary structural control affecting the pliocenic turbidites deposited in an elongate foreland basin formed in front of the growing Northern Apennines orogenic wedge. Several Pliocene marine foreland basin outcrops along the Apennine Chain. The sedimentary basin of Montecalvo-in-Foglia is located on the Pedeapennine margin, shows a synclinal structure and was formed on an active thrust. This basin is one of the better preserved cases in the Apennine chain, which originated and evolved during the later compressive tectonic phases from Late Miocene to Early Pliocene. It was completely filled by terrigenous sequence deposited during the Pliocene between 4.2-2.9 My. The stratigraphic succession records the progressive closure of the Apennine foredeep basin due to the NE propagation of thrust fronts. The foreland basin of Montecalvo-in-Foglia, confined by two adjacent thrusts systems, is characterized by two turbidite systems: one deposited during periods of highstand of sea-level, with low sedimentation rates and muddy deposits: the other, very coarse-grained with high sedimentation rates, was deposited during periods of lowstand of sea-level. High frequency tectonic uplift “events” within a short interval of time, about 1.3 My are thought to be responsible for relative sea-level lowstand. The coarseness and volume of the turbidite units appear to be related both to eustatic sea-level and/or to regional tectonism. Both factors combine to create the basic framework within which turbidite bodies were deposited. Turbidite systems reflect an alternation of thrust activity and quiescence. The regional distribution of facies and facies associations, and the orogenic trends, shows that the foreland basin was narrow, elongated (NW-SE) and confined within the Peri-Adriatic foredeep. It was characterized by an internal margin with continuous syn-sedimentary tectonic activity (slumps, cannibalistic input, allochthonous Ligurian sheets have been identified). Nevertheless, the coarse-grained turbidite facies are seen to be the result of the collapse of the shelf as well as the interaction between tectonic uplift, tilting of the depositional surfaces, and eustatic sea-level fall. The rapid sea-level fluctuations in the Pliocene probably contributed to the changes in sedimentation style, and to a significant increase in the volume of turbidity currents. It is concluded the causes of cyclicity in the coarse-grained turbidite sequence are complex. They include factors both internal and external to the sedimentary setting, such as subsidence and tectonic uplift, relative sea-level variation, climate changes during the Pliocene and global astronomical cycles.

Speaker
Biography:

Jincai Tuo is a Professor at Key Laboratory of Petroleum Resources Research, Chinese Academy of Sciences. His main research areas are oil & gas geology, application of organic geochemistry, and unconventional oil and gas resources. In recent years, more than 80 papers were published in domestic and international academic journals, including 25 papers cited by SCI and 16 papers cited by EI. He was awarded American Association of Petroleum Geologists (Foundation AAPG) Grants-in-Aid scholarship twice. He has made important achievements and great progress in hydrocarbon source rock evaluation, natural gas accumulation and shale oil and gas exploration.

Abstract:

Statement of the Problem: Marine black shales were widely developed during the Early Cambrian (Niutitang Formation), Late Ordovician (Wufeng Formation), and Early Silurian (Longmaxi Formation) periods. Discovery of the Jiaoshiba shale gas field in southeastern margin of the Sichuan Basin marks a significant progress in the shale gas exploration in the Wufeng-Longmaxi Formation and has a guiding significance for shale gas exploration in China. Compared with the Upper Ordovician-Lower Silurian shales, the Lower Cambrian Niutitang shales are more widely and stably distributed throughout southern China, and contain higher TOC with greater thermal maturity levels. Therefore, the Lower Cambrian black shales also have a promising potential of shale gas.

Methodology & Theoretical Orientation: In this study, Lower Paleozoic shale samples collected from Lower Cambrian Niutitang Formation, Upper Ordovician Wufeng Formation, and Lower Silurian Longmaxi Formation in different regions in the Sichuan Basin were analyzed using geochemical and petrophysical methods to characterize the difference in organic matter properties (including abundance, type and thermal maturity), pore development, mineralogy to shale gas resources potential.

Findings: The total porosity of the lower Paleozoic marine shales displays a roughly decreasing trend with increasing age. The Lower Cambrian shales with higher TOC have pore sizes skewed toward smaller pores and lower total pore volumes, most notably pore sizes with a distribution range of less than 50 nm, whereas in the Lower Silurian shales, the pores are almost uniformly distributed over different pore sizes (micropores, mesopores and macropores).

Conclusion & Significance: The negative relationship was observed between the total porosity and the TOC and quartz contents in the three Paleozoic marine shales suggests that re-precipitated pyrobitumen (coke) created by oil cracked to gas in overmature source rocks may have led to the lowest porosity level and minimum pore sizes in the most aged but most TOC-abundant shales.