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developmental modes of the Neoproterozoic-Lower Paleozoic marine hydrocarbon source rocks in china

Science Bulletin 2007年第S1期 77-91页

作者： zhang baomin1, zhang shuichang1, {2. lizeng2. jin zhijun3 & wang darui1 1 research Center of petroleum geology in research {12. of petroleum exploration and development, petrochina, beijing 100083, china 2.Department of Earth Sciences, Nanjing University, Nanjing 2.0093, china 3 research {12. of petroleum exploration and development, Sinopec, beijing 100083, china

Based on the researches on rock type, the mode of occurrence, diagnostic minerals and creatures, the sedimentary geochemistry and organic facies of Chinese marine source rocks from wells and outcrops, and on the research findings of {2.al modes of foreign marine source rock, the authors consider that it is impossible to objectively make clear the formation mechanism of hydrocarbon source rock with high organic matter abundance by either single mode of preservation or high organic matter productivity. According to the Chinese geological features, the formation mechanism of the Neoproterozoic-Lower Paleozoic marine source rock is generalized into four modes, namely, thermal water activity-upwelling flow-anoxic; carbonate gentle slope-upwelling flow; xerothermic climate-brine euxinic milieu; and humid climate-retained euxinic milieu; as the Lower Cambrian undercompensation basin organic facies (the Tarim Basin, South china and southwestern margin of North china), carbonate gentle lime mud bound organic facies (the Upper Ordovician in Tazhong region of the Tarim Basin and the Lower Silurian in the Upper Yangtze Platform), the Middle Cambrian evaporation laggon organic facies (the Tarim Basin and the Upper Yangtze Platform), enclosed undercompensation terrigenous bay organic facies (the Middle-Upper Ordovician in the west of the Tarim Basin, the Lower Silurian Longmaxi Formation in the Upper Yangtze platform). Chinese marine sedimentations with lower organic matter abundance are generalized into two modes of consumption-dilution mode of open epicontinental sea and depletion-dilution mode of supercompensation basin.

关键词： marine source rock upwelling flow anoxic event thermal water activity xerothermic climate-brine euxinic humid climate-retained euxinic

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developmental modes of the Neoproterozoic-Lower Paleozoic marine hydrocarbon source rocks in china

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Chinese Science Bulletin 2007年第A01期52卷 77-91页

作者： zhang baomin zhang shuichang bian lizeng jin zhijun wang darui research Center of petroleum {2. in research institute of petroleum exploration and development PetroChina Beijing 100083 China Department of Earth Sciences Nanjing University Nanjing 210093 China research institute of {2. exploration and development Sinopec Beijing 100083 China

关键词：上升流海洋岩石干温

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The Xiamaling oil shale generated through Rhodophyta over 800 Ma ago

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Science china Earth Sciences 2007年第4期50卷 527-535页

作者： zhang shuichang zhang baomin bian lizeng jin zhijun wang darui CHEN JianFa research Institution of petroleum {2.&development Beijing 100083China CNPC Key Laboratory for petroleum Geochemistry Beijing 100083China Department of Geosciences Nanjing UniversityNanjing 210093China research Institution of petroleum {2.&development SINOPECBeijing 100083China College of Resources and Information University of PetroleumBeijing 102200China

A suit of oil shales, predominated by black argillaceous silicalite and finely laminated black-brown shale, has been discovered in a set of carbonaceous-siliceous mudstone formations (350 m in thickness) in the third member of Xiamaling Formation of the Upper Proterozoic Qingbaikou Series (900―873 MaBP), Xiahuayuan, Hebei Province, china. The oil shale, combustible with strong bitumen odour, has su- per-high TOC contents ranging from 2..4% to 2..9%, bitumen “A” contents from 0.58% to 0.88% and oil length from 5.2.% to 10.57%. The ultrathin section observation of the shale and the identification of its kerogen demonstrate that its hydrocarbon-generative parent material is mainly benthonic Rhodophyta whose specific tetrasporangia are legible and abundant. It is rarely reported in the literature that such a hydrocarbon-generative parent material, composed mainly of Rhodophyta and with extraordinarily high contents of TOC and bitumen “A”, developed into a set of high-quality source rocks. The extracts of the oil shale are characteristic of richness in 17α(H)-diahopanes and n-alkyl tricyclic terpenoids but low in steranes. Such a biomarker feature is obviously different from that of the extracts from other Proterozoic marine carbonate source rocks of the studied area. Since the biological constitution of this oil shale is rather simple, it is clear that these biomarkers most likely represent to certain extent the specific mo- lecular constitutions of the benthonic Rhodophyta identified in the ultrathin sections of the samples. Studies on its lithologic association and depositional sequences suggest that this suit of the carbona- ceous-siliceous mudstone formation, which contains oil shales, was probably developed in an under- compensation deep-bay environment when a maximum transgression occurred during the formation of the third member of Xiamaling Formation. The high concentration of SiO2.in this organic-rich rock and the positive correlation between TOC and some trace

关键词： Xiamaling oil shale Rhodophyta 17α(H)-diahopanes Xiamaling Formation Neo-Proterozoic Xiahuayuan

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