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Wave-Enhanced Sediment-Gravity Flows in Bohai Bay lacustrine basin, Eastern China

Acta Geologica Sinica(English Edition) 2018年第6期92卷 2416-2431页

作者： BAI Chenyang YU Bingsong DONG Tianyang HAN Shujun GE Jia ZHU Donglin School of Geosciences and Resources China University of Geosciences(Beijing) Department of Earth Environmentaland Planetary SciencesRice University Oil & Gas Survey China Geological Survey Bureau of Geophysical Prospecting Inc. China National Petroleum Corp. Department of Geosciences University of Texas at Dallas

Sequences of wave-enhanced sediment-gravity flows(WESGFs) have been widely recognized in the marine shelf environment. In this study, we show observations of WESGF deposits in lacustrine settings using well core and thin section data from the Paleogene in the Jiyang sub-basin, Bohai Bay basin, eastern China. The findings of this study include the following: 1) the sequence of WESGFs in the lacustrine basin is similar to that of marine; it consists of three units, MF1 unit: siltstone with basal erosion surface, MF2 unit: silt-streaked claystone, and MF3 unit: silty-mudstone; and 2) prodelta sand sheets are found in the lacustrine WESGF sequence and are classified as the MFd unit: clay-streaked siltstone. However, because the system size and variability in hydrodynamic conditions are different between the lacustrine and marine basins, lacustrine WESGFs do appear to have three distinguishable features: 1) the sediment grain size and sand content are slightly higher than those of the marine WESGFs; 2) lacustrine WESGFs may contain prodelta sediments or sedimentary sequences of other types of gravity flows, such as hyperpycnal flows; and 3) the scale of the sedimentary structures for lacustrine WESGFs is smaller. The WESGFs found in the continental lacustrine basin provide a new model for sediment dispersal processes in lake environments and may be helpful to explain and predict the distribution of sandy reservoirs for oil and gas exploration.

关键词： wave-enhanced sediment-gravity flows sediment transport lacustrine basin Shahejie Formation Bohai Bay basin

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lacustrine basin Slope Break — A New Domain of Strata and Lithological Trap Exploration

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Petroleum Science 2004年第2期1卷 55-61页

作者： WangYingmin LiuHao XinRenchen JinWudi WangYuan LiWeiguo basin＆ReservoirResearchCenter UniversityofPetroleumBeijing102249China KeyLaboratoryforHydrocarbonAccumulationofEducationMinistry UniversityofPetroleumBeijing102249China ChinaUniversityofGeoscinces Beijing100083China

Based on the studies of the Songliao basin characterized by Cretaceous down-warping, of the Jurassic compressional flexural Junggar basin and of the Bohai Bay basin characterized by Paleogene rifting, the multiple-grades slope break has developed in lacustrine basins of different origins. Their genetic types can be divided into tectonic slope break, depositional slope break and erodent slope break. The dominant agent of the slope break is tectogenesis, and the scale of slope breaks relates with the size of tectogenesis. The results of the study show that control of mutual grades slope breaks on atectonic traps mainly represent: 1) Atectonic traps develop close to mutual grades slope breaks, with beads-shaped distribution along the slope breaks. 2) In the longitudinal direction, the development of atectonic traps is characterized by the inheritance. 3) Different slope breaks and their different geographical positions can lead to different development types of atectonic traps. 4) A slope break can form different kinds of atectonic traps because of its great lateral variation. 5) The existence of mutual-grade slope breaks leads to different responses of erosion and deposition at different geographical positions in the basin. The oil source bed, reservoir and cap rock combination of atectonic traps is fine. 6) The oil-bearing condition of atectonic traps controlled by slope breaks is very favorable.

关键词： Slope break lacustrine basin sequence stratigraphy atectonic trap

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Geochemistry and heterogeneous accumulation of organic matter in lacustrine basins:A case study of the Eocene Liushagang Formation in the Fushan Depression,South China Sea

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Petroleum Science 2022年第6期19卷 2533-2548页

作者： Bang Zeng Mei-Jun Li Ning Wang Yang Shi Fang-Zheng Wang Xin Wang State Key Laboratory of Petroleum Resources and Prospecting College of GeosciencesChina University of Petroleum(Beijing)Beijing102249China Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of EducationCollege of Resources and EnvironmentYangtze UniversityWuhanHubei430100China Southern Oil Exploration and Development Company Petro ChinaHaikouHainan570216China

Determining the spatial distributions of organic-rich mudstones in hydrocarbon-bearing lacustrine basins is crucial for targeting exploration wells and discovering commercially viable petroleum accumulations.However,the strong heterogeneity of sedimentary systems and organic matter(OM)input and accumulations make it difficult to identify OM-rich mudstones in lacustrine deposits.This paper takes the Eocene Liushagang Formation,in the Fushan Depression,South China Sea,as an example to clarify the relationship between the geochemical characteristics of OM and sedimentary facies.A practical approach is proposed for predicting the spatial distribution of good-quality source rocks with high OM contents.The method used is a combination of logging-based surface fitting and the mudstone to stratum thickness ratio(M/S ratio)of different depositional systems.It was found that this approach improved TOC content prediction both vertically and laterally.The results suggest that semi-deep lacustrine mudstones with predominantly aquatic organism input,deposited in suboxic-anoxic saline stratified water,contain more preserved OM than other mudstones.Using this method,limited areas on the southern slope of the lower Liushagang sequence(SQls3),the central part of the Huangtong Sag in the middle Liushagang sequence(SQls2),and the northern part of the Huangtong Sag in the upper Liushagang sequence(SQls1)are determined to be the best-quality source rocks in the development area.

关键词： Organic matter Geochemical characteristics Heterogeneous accumulation Areal distribution lacustrine basin

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Syndepositional Fault Control on Sandbody Distribution at Two Eocene Confluence Deltas in the Dongying Depression,Bohai Bay basin(Eastern China)

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Journal of Earth Science 2023年第4期34卷 1095-1111页

作者： Renchao Yang Yang Li Aiping Fan Nils Lenhardt Shuvabrata De Jie Chen Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Department of Geology University of PretoriaPrivate Bag X20Pretoria 0028South Africa School of Earth Sciences East China University of TechnologyNanchang 330013China

The prediction of sandstone distribution is the main target for hydrocarbon exploration and petroleum reservoir engineering,especially in a rift basin with a complex geological setting.During the Middle Eocene,the Dongying and Yong’an deltas converged in the Dongying depression of the Bohai Bay basin,eastern China.So far,studies on the control of the existing syndepositional faults on the deltaic sandbodies of the two confluence deltas have been largely neglected.In this contribution,the sedimentary characteristics and spatial distribution of the two deltas,converging in the Dongying depression,were determined.In addition,the morphodynamic controlling factors of the deposits of the two deltas were identified based on core examination,log analysis,and seismic data analysis.During delta progradation,the sandbodies of the initially separated deltas were affected by the development of syndepositional tensional faults,which eventually also influenced the distribution of the sandstone reservoirs.The results of this study can not only be applied to petroleum reservoir engineering but also provide important new information for the studies on delta sandbody all over the world.

关键词： lacustrine basin syndepositional fault delta deposits tectonic-depositional model Dongying depression Shahejie Formation tectonics.

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Variation in Pore Space and Structure of Organic-rich Oilprone Shales from a Non-marine basin:Constraints from Organic Matter and Minerals

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 1057-1069页

作者： JIA Jianliang LIU Zhaojun ZHOU Renjie LIU Rong GAO Yuan Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China College of Earth Sciences Jilin UniversityChangchun 130061China School of Earth and Environmental Sciences University of QueenslandBrisbane QLD 4072Australia Beijing Center for Physical and Chemical Analysis Beijing 100089China

Organic matter(OM)and minerals are major particle components of lacustrine shales.The influence of OM and minerals on pore space and structure in organic-rich oil-prone shales containing a large range of total organic carbon(TOC)contents is poorly understood.In this study,we investigated the variation in pore space and structure of low mature lacustrine shales in the Songliao basin(NE China),based on a study of the mineralogy,petrography,geochemistry,and geophysical properties of shales.Different pore types make markedly different contributions to the mineral surface area(MSA)and pore volume(PV)of the shales.There exists a negative correlation between MSA/PV and TOC in mesopores(r^(2)=0.75/0.65)and macropores(r^(2)=0.74/0.68),and a positive correlation in micropores(r^(2)=0.59/0.64),which are associated with the variation of mineral and TOC contents.A positive relationship between the throat/pore ratio and TOC(r^(2)=0.82)shows an increase in throat radius and decrease in pore radius with increasing TOC content.This relationship is supported by the reduction in mean pore diameter(MPD)for large pores and increase in MPD for small pores.These variations are related to the decreased pores by quartz plus feldspar(Q+F)content,increased throats by clay minerals,an d enhanced pore-fill by OM.We propose that the variation of OM and minerals is a key control on the pore space and structure of low mature organic-rich oil-prone shales.

关键词： lacustrine basin oil-prone shale pore space pore structure OM-mineral association

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The Late Cretaceous source-to-sink system at the eastern margin of the Tibetan Plateau:Insights from the provenance of the Lanping basin

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Geoscience Frontiers 2021年第3期12卷 279-295页

作者： Licheng Wang Lijian Shen Chenglin Liu Ke Chen Lin Ding Chengshan Wang CAS Center for Excellence in Tibetan Plateau Earth Sciences Key Laboratory of Continental Collision and Plateau UpliftInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Yunnan Geological Survey Kunming 650051China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

The surface uplift of the Tibetan Plateau(TP)and its geomorphology evolution has triggered aridification of Asia's interior and drainage development at the eastern margin of the plateau.However,how the pre-Cenozoic early growth histories of the TP impact the drainage system and climate is poorly constrained.The Late Mesozoic lacustrine evaporite-bearing basins on the eastern margin of the TP record significant information on the uplift of the source terranes,source-to-sink system development and climate change.In this study,we presented detrital zircon U-Pb ages from the Upper Cretaceous Yunlong Formation in the Lanping basin,as well as Hf isotopic,petrographic,direct statistical,and multidimensional scaling analyses,and use them to characterize the provenance and reconstruct the drainage system.All of the samples have five major age peaks at 200-290 Ma,400-490 Ma,750-1000 Ma,1750-1950 Ma,and 2400-2600 Ma with mostly negativeε_(Hf)(t)values(81%).We infer the sediments are primarily derived from recycled sediments of the Songpan-Garze terrane,and partly from the Sichuan basin and the Southern Qiangtang terrane,as well as the exposed magmatic rocks of the Yidun Arc and SongpanGarze terrane.The provenance features of the contemporaneous sediments from the Sichuan,Xichang,Chuxiong,and Simao basins indicate a complex hierarchical drainage pattern on the eastern margin of the TP during the Late Cretaceous.The hierarchical drainage system exhibits a complete gradational cycle of lake-basin types from overfilled freshwater Sichuan basin through balanced fill saline Xichang basin and underfilled hypersaline Chuxiong,Lanping,Simao,and Khorat Plateau basins from proximal to distal.The early growth of the TP primarily controlled the drainage and lake-basin evolution by not only causing the uplift and exhumation of the source areas and providing large amounts of clastic material to the proximal sub-drainage areas but also intensifying the aridity and deposition of evaporites.

关键词： Detrital Zircons Drainage Late Cretaceous Source-to-sink lacustrine basin Tibetan Plateau

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Multiple-stacked Hybrid Plays of lacustrine source rock intervals：Case studies from lacustrine basins in China

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Petroleum Science 2017年第3期14卷 459-483页

作者： Shu Jiang You-Liang Feng Lei Chen Yue Wu Zheng-Yu Xu Zheng-Long Jiang Dong-Sheng Zhou Dong-Sheng Cai Elinda Mc Kenna Energy and Geoscience Institute University of UtahSalt Lake City UT 84108 USA Research Institute of Unconventional Oil and Gas and Renewable Energy China University of Petroleum (East China) Qingdao 266580 Shandong China Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 Sichuan China Sinopec Petroleum Exploration and Production Research Institute Beijing 100083 China PetroChina Hangzhou Institute of Geology Hangzhou 310023 Zhejiang China School of Ocean Sciences China University of GeosciencesBeijing 100083 China CNOOC Beijing 100027 China

Hydrocarbon-producing lacustrine basins are widely developed in the world, and China has a large number of lacustrine basins that have developed since the early Permian. The organic-rich shale-dominated heterogeneous source rock intervals in Chinese lacustrine basins generally contain frequent thin interbeds of stratigraphically associated sandstone, siltstone, marl, dolomite, and limestone. The concept of ‘‘Hybrid Plays＇＇ as put forth in this article recognizes this pattern of alternating organicrich shale and organic-lean interbeds and existence of mixed unconventional and conventional plays. Hybrid Plays in lacustrine source rock intervals present a unique closed petroleum system hosting continuous hydrocarbons.The interbedded organic-lean siliciclastic and/or carbonateplays are efficiently charged with hydrocarbons via short migration pathways from the adjacent organic-rich shale that is often also a self-sourced play. We assert ‘‘Hybrid Plays＇＇ provide the most realistic exploration model for targeting multiple-stacked and genetically related very tight shale, tight and conventional plays together in the entire source rock interval rather than individual plays only. The Hybrid Play model has been proven and works for a wide variety of lacustrine rift, sag and foreland basins in China.

关键词： lacustrine basin Hybrid Plays - Shale Interbed Source rock Petroleum system

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Palaeoclimate of the Paleogene Dongying Formation in Bozhong Sag of Bohai Bay basin

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Petroleum Research 2021年第4期6卷 368-378页

作者： Juan Zhang Chenchen Wang Jingmin Wang Linbo wang Yunqian Jia Rongrong Hu College of Earth Sciences Yangtze UniversityWuhan430100HubeiChina Laboratory of Reservoir Microstructure Evolution and Digital Characterization Wuhan430100HubeiChina Cooperative Innovation Center of Unconventional Oil and Gas Yangtze UniversityWuhan430100China School of Petroleum Engineering Yangtze UniversityWuhan430100China

It was showed that the sedimentary environment of lacustrine basins is more susceptible to basin size than that of marine basins,leading to frequent changes in sedimentary environment and large differences in sediment supply and types.Based on the comprehensive analysis of clay minerals,spore pollen,major elements and trace elements,the sedimentary environment of Dongying Formation and its evolution in Bozhong Sag were studied.The results showed that during the sedimentary period of Dongying Formation,the study area was in a subtropical warm and humid climate as a whole.In addition,the vertical distribution of spore pollen and algae was divided into four zones and each one represents different sedimentary environments.Combination zone I is characterized by a large number of spore pollen and algae,including juglanspollenites verus,ulmipollemites minor,abietineaepollenites and pinuspollenites,taxodiaceaepollenites hiatus,leiosphaeridia and granodiscus,and it indicates a relatively hot and dry climatic;Combination zone II mainly contains juglanspollenites verus,ulmipollemites minor,abietineaepollenites and pinuspollenites,pediastrum and leiosphaeridia.Compared with I,the number of spore pollen and algae decreases,but the number of pediastrum increases a lot,which represents warm and humid climate.The combination zone III is dominated by abietineaepollenites and pinuspollenites and chaetosphaeridium,and the species and quantity decrease significantly.It indicates a relatively hot and humid climate at that time.Combination zone IV contains a small amount of spore pollen and algae,and it means the climate was warm and humid at that period.The frequent changes of sedimentary environment in lacustrine basins are influenceded by regional tectonic environment and basin scale.Using S/A and E-T parameters,the paleoclimate in the study area was delineated and 10 sedimentary environment interfaces were identified,which further illustrated the characteristics of frequent fluctuations of sedimentary environment in lacustrine bas

关键词： Clastic rocks Spore pollen assemblage zone Sedimentary environment Bozhong sag lacustrine basin

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