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Chemo-and Biostratigraphy of the Jurassic oil shales from the Qiangtang Basin,Northern Tibet,China:A Case Study of the Toarcian Oceanic Anoxic Event

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 630-643页

作者： CHEN Lan XU Guiwen DA Xuejuan YI Haisheng ZHU Zhangxiong HUANG Zhaohui LI Xiaogang Chongqing University of Science and Technology Chongqing 401331China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences99 West Lincheng RoadGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059SichuanChina

The marine oil shales of the Qiangtang Basin, northern Tibet, exposed in the Biluo Co, Tuonamu, Shenglihe and Changsheshan areas are believed to be important petroleum source rocks. This work comprehensively analyzed the carbon isotopes, trace elements, and calcareous nannofosills, ammonites and bivalves of the Biluo Co section in the Qiangtang Basin. The organic carbon isotopes show a positive excursion close to 2.17‰（relative to PDB）, which, albeit significantly smaller, may also be associated with other Early Toarcian Oceanic Anoxic Events（T-OAE） in the European epicontinental seas and the Tethyan continental margins. Coinciding with the Early Toarcian transgression, the oxygen deficiency in bottom water had led to dysoxic-anoxic conditions and deposition of black shales lacking benthic fauna. Under such condition, the redox-sensitive trace metals such as Mo, V, Ni, Cr, and U were enriched, in conjunction with high planktonic productivity of Watznaueriaceae calcareous nannofossils. Comparison of the results with the records of chemo-and biostratigraphy, as well as the palaeogeography during the Early Jurassic suggests that the anoxia linked to the Early Toarcian oceanic anoxic event was mainly caused by the high surface water temperature, sea-level rise and an increase of surface water productivity.

关键词： oil shales geochemistry palaeontology T-OAE northern Tibet Proto-Tethys

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Organic Geochemistry of the Early Jurassic oil Shale from the Shuanghu Area in Northern Tibet and the Early Toarcian Oceanic Anoxic Event

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Acta Geologica Sinica(English Edition) 2005年第3期79卷 392-397页

作者： CHENLan YIHaisheng HURuizhong ZHONGHong ZOUYanrong OpenLaboratoryofOreDepositGeochemistry InstituteofGeochemistryChineseAcademyofSciencesGuiyangGuizhou550002 OpenLaboratoryofOreDepositGeochemistry InstituteofGeochemistryChineseAcademyofSciencesGuiyangGuizhou550002／／GraduateSchoolofChineseAcademyofSciencesBeijing100039 InstituteofSedimentaryGeology ChengduUniversityofTechnology Chengdu Sichuan610059 StateKeyLaboratoryofOrganicGeochemistry GuangzhouInstituteofGeochemistryChineseAcademyofSciencesGuangzhouGuangdong510640

This paper presents new geological and geochemical data from the Shuanghu area in northern Tibet, which recorded the Early Toarcian Oceanic Anoxic Event. The stratigraphic succession in the Shuanghu area consists mostly of grey to dark-colored alternating oil shales, marls and mudstones. Ammonite beds are found at the top of the Shuanghu oil shale section, which are principally of early Toarcian age, roughly within the Harplocearas falciferrum Zone. Therefore, the oil shale strata at Shuanghu can be correlated with early Toarcian black shales distributing extensively in the European epicontinental seas that contain the records of an Oceanic Anoxic Event. Sedimentary organic matter of laminated shale anomalously rich in organic carbon across the Shuanghu area is characterized by high organic carbon contents, ranging from 1.8% to 26.1%. The carbon isotope curve displays the δ 13C values of the kerogen (δ 13Ckerogen) fluctuating from –26.22 to –23.53‰ PDB with a positive excursion close to 2.17‰, which, albeit significantly smaller, may also have been associated with other Early Toarcian Oceanic Anoxic Events (OAEs) in Europe. The organic atomic C/N ratios range between 6 and 43, and the curve of C/N ratios is consistent with that of the δ 13Ckerogen values. The biological assemblage, characterized by scarcity of benthic organisms and bloom of calcareous nannofossils (coccoliths), reveals high biological productivity in the surface water and an unfavorable environment for the benthic fauna in the bottom water during the Oceanic Anoxic Event. On the basis of organic geochemistry and characteristics of the biological assemblage, this study suggests that the carbon-isotope excursion is caused by the changes of sea level and productivity, and that the black shale deposition, especially oil shales, is related to the bloom and high productivity of coccoliths.

关键词： oil shales Early Toarcian organic carbon isotope organic atomic C/N ratios Oceanic Anoxic Events northern Tibet

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Resources Potential Evaluation of Movable Shale oil in the E2S4 Enrichment Segment of Damintun

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 324-325页

作者： WANG Xin LU Shuangfang CHEN Guohui LI Jinbu Research Institute of Unconventional Petroleum and Renewable Energy China University of Petroleum Qingdao266580 Shandong China School of Geosciences China University of Petroleum Qingdao 266580 Shandong China

Has been recognized that oil and gas is common in the mud shale and oil volume is mainly influenced by geochemical characteristics of source rock （the abundance, type and maturity）, workability mainly influenced by ... 详细信息

关键词： SHALE oils HYDROCARBONS POWER resources STANDARDS oil shales

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Geological Modeling on the Reservoir of oil Sand in Estuary

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 106-108页

作者： WU Yihao LU Shuangfang CHEN Fangwen XIAO Hong YUAN Dandan Research Institute of Unconventional Petroleum andRenewable Energy China University of Petroleum Qingdao266580 Shandong China School of Geosciences China University of Petroleum Qingdao 266580 Shandong China Exploration and Development Research Institute PetroChina Huabei Oilfield Company Renqiu 062552 Hebei China

1 Introduction Pore is the major oil and gas reservoir, and its volume and structure determines the gas capacity of shale and the occurrence mode of gas. The development of shale porosity is mainly affected by the content and diagenesis of quartz, clay and some other minerals, the content and maturity of TOC, the strength and time of tectonic activities etc., besides the study ofpore＇s character of shale reservoir is an important prerequisite to exploration and production of shale hydrocarbon and guarantee and improvement of hydrocarbon reserves. Among pores, the organic pores include organic matter pores and biological fossil pores.

关键词： oil shales GEOLOGICAL modeling FORMATION damage (Petroleum engineering) oil sands PETROLEUM geology

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The Forming Condition and Exploration Potential of condensed oil in Xiagou Formation,Liugouzhuang Area,Jiuquan Basin

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 370-371页

作者： ZHANG Chengcheng LIAO Yuantao Key Laboratory of Tectonics and Petroleum Resources Ministry of Education China University of Geosciences(Wuhan) Wuhan 430074 China Faculty of Earth Resources China University of Geosciences Wuhan 430074 China

Recent exploration have characterized reservoirs in early Cretaceous Xiagou Formation in Liugouzhuang Area, Qingxi Sag, Jiuquan Basin as typical condensed oil reservoirs, which further broadens the exploration area of... 详细信息

关键词： PETROLEUM prospecting RESERVOIRS oil shales SEDIMENTATION & deposition SEDIMENTARY rocks

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Characterization of pore structures of gas shales using modified BET equation

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 417-418页

作者： TIAN Hui PAN Lei LI Tengfei XIAO Xianming State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences

Currently, the conventional BET equation, DR and BJH models are widely used to characterize the pore structures of gas shales. These models, however, were originally constructed on the basis of homogenous materials of micropores or meso-/macro-pores, and therefore they cannot be directly used to characterize the heterogeneous pores in shales.

关键词： oil shales RESEARCH EQUATIONS MICROPORES CATALYSIS -- Synthesis oil shale reserves

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Prediction of Total Organic Carbon Content Based on Geostatistical Inversion:A Case of Qingshankou Formation in Wangfu Depression,Songliao Basin

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 130-131页

作者： ZHANG Luchuan LU Shuangfang XIAO Dianshi GUO Siqi GU Meiwei Research Institute of Unconventional Petroleum and Renewable Energy(RIUP & RE) China University of Petroleum(East China)

Currently, there are two main methods to obtain total organic carbon （TOC） content in mud shale geochemical analysis and AlgR model. Geochemical analysis can obtain accurate TOC content, but it has the problem of higher cost and less samples. The AlgR model can obtain TOC content variable values in well profile conveniently and quickly, but it can＇t predict TOC content in mud shale in cross-hole area. Both the methods can＇t meet the needs of resources evaluation of shale oil in the back ground of strong organic heterogeneous in mud shale.

关键词： CARBON compounds GEOLOGICAL statistics BASINS (Geology) SURFACE impedance oil shales CHINA

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Static and Dynamic Elastic Property of Lonamaxi Shale in the West of Hunan Province and Its Implication

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 307-309页

作者： ZHAO Weihua SUN Dongsheng LI Awei Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources Beijing 100081 Institute ofGeomechanics CAGS Beijing 100081

1 Introduction As an important unconventional hydrocarbon resource, shale gas has been paid more attention. Elastic property of shale is useful for seismic profile explaining, brittleness estimation, completion and hydro production design （Arjun et al., 2013）. For the reason of different mineral components, shale samples from different reservoir or different layers in the same reservoir have different elastic property generally （Homby et al., 1994; Joshi et al., 2012）, it is thus necessary to study elastic property of shale, especially in complicated structure region.

关键词： oil shales ANISOTROPY ELASTICITY BRITTLENESS POISSON distribution

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Pre-stack Simultaneous AVO Inversion and Lithology Prediction of Shale Gas Reservoir

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 359-360页

作者： WANG Fei CHENG Lijun XIE Qingming HUANG Zhenhua Key Laboratory of Shale Gas Exploration Ministry of Land and Resources Chongqing Institute of Geology and MineralResources Chongqing 400042 China Chongqing Engineering Research Center for Shale Gas Resource & Exploration Chongqing Institute of Geology andMineral Resources Chongqing 400042 China Chongqing Shale Gas Research Center of State Key Laboratory of Petroleum Resource and Prospecting ChongqingInstitute of Geology and Mineral Resources Chongqing 400042 China

Shale gas is mainly gathered in shale in adsorbed and in free forms . Shale gas reservoirs have the characteristics of self-generating and self-preserving, low density, low porosity and low permeability, which make th... 详细信息

关键词： SHALE gas reservoirs oil shales PETROLOGY SEISMIC prospecting oil well drilling

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Prediction of Element and Clay Mineral Content in Lacustrine Mudstone Using Logging Data:an example from Dongying Depression

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 378-382页

作者： CHEN Zhonghong HUANG Wei SUN Tengkui WANG Xiaoyang CHEN Zhiqiang China University of Petroleum

1 Introduction Clay minerals are main components in shale and mudstone, different components including montmorillonite, Illite/montmorillonite （I-S） mixed layer, illite and chlorite in shale have different gas sorpt... 详细信息

关键词： CLAY minerals ILLITE oil shales ENERGY minerals MUDSTONE SEDIMENTARY rocks CHLORITE minerals

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