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Influence on lacustrine source rock by hydrothermal fluid： a case study of the Chang 7 oil shale, southern Ordos Basin

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Acta Geochimica 2018年第2期37卷 215-227页

作者： Delu Li Rongxi Li Zengwu Zhu Xiaoli Wu Futian Liu Bangsheng Zhao Baoping Wang School of Earth Sciences and Resources Chang'an University Xi'an 710054 China Shaanxi Center of Geological Survey Xi'an 710068 China Yanchang Oilfiled Co. Ltd Yan'an 716000 China

Hydrothermal fluid activity during sedimenta- tion of the Triassic Yanchang Formation in the Ordos Basin and the impact of said activity on formation and preservation conditions of source rocks have received little attention. Oil yield, major element, trace element, rare earth element, and total sulfur （TS） data from the oil shale within the Yanchang are here presented and discussed in the context of hydrothermal influence. Oil shale samples returned relatively high total organic carbon （TOC）, in the range of 4.69%-25.48%. A high correlation between TS and TOC suggests TS in the oil shale is dominated by organic sulfur and affected by organic matter. The low Al/ Si ratio of oil shale samples implies quartz is a major mineralogical component. Si/（Si ＋ Al ＋ Fe） values suggest close proximity of the oil shale to a terrigenous source. δEu; Fe versus Mn versus （Cu ＋ Co ＋ Ni）× 10; and SiO2/（K2O ＋ Na2O） versus MnO/TiO2, Fe/Ti, and （Fe ＋ Mn）/Ti are evidence of hydrothermal fluid activity during oil shale sedimentation, and δU and U/Th of the oil shale indicate reducing conditions. The Sr/Ba of oil shale samples suggests fresh-water deposition. The high correlations of Fe/Ti and （Fe ＋ Mn）/Ti with δU, U/Th, and TS demonstrate that hydrothermal fluid activity promotes reducing conditions. Sr/Ba ratios had low correlation with Fe/Ti and （Fe ＋ Mn）/Ti, implying that hydrothermal fluid activity had little impact （Fe ＋ Mn）/Ti, δU, U/Th, and on paleosalinity. Fe/Ti, Cu ＋ Pb ＋ Zn all exhibited high positive correlation coefficients with TOC in oil shale samples, suggesting that more intense hydrothermal fluid activity improves conditions in favor of formation and preservation of organic matter.

关键词： Hydrothermal fluid activity lacustrine source rock Element geochemistry Chang 7 Ordos Basin

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Origin of Phosphate-bearing Carbonate Concretions in the Upper Triassic lacustrine Black Shales of the Southern Ordos Basin,China

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 883-894页

作者： ZHANG Long LIU Chiyang ZHANG Dongdong QU Shaodong MA Huanhuan JIANG Chong LEI Kaiyu Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi’an Shiyou UniversityXi’an 710065China Shandong Key Laboratory of Depositional Mineralization&Sedimentary Mineral Shandong University of Science and TechnologyQingdao 266590China School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’an 710065China State Key Laboratory of Continental Dynamics Northwest UniversityXi’an 710069China Shaanxi Provincial Land Engineering Construction Group Xi’an 710075China Oil and Gas Exploration Company of Shaanxi Yanchang Petroleum(Group)Co.LTD Yan’anShaanxi 716000China

Carbonate concretions are conspicuous in organic-rich shales and are generally related to decomposition of organic *** black shales from the Chang 7 Member of the Upper Triassic Yanchang Formation of the southern Ordos Basin host abundant carbonate concretions,which provide a unique record of depositional and early diagenetic conditions of the paleo-lake ***,little attention has been given to the genesis and growth processes of the concretions in these lacustrine petroleum source *** petrographic observations and geochemical analysis show that the concretions are composed of calcite,phosphate fossil fragments,K-NH4-feldspar,quartz,bitumen,and minor *** minerals,mainly carbonate fluorapatite(CFA),show pervasive replacement by calcite,most of which contains phosphorus,ranging in concentration from 0.26 to 2.35 wt%.This suggests that the phosphate minerals are the precursors for concretion ***δ13C(+5.6 to+12.4‰V-PDB)signatures and the absence of pyrite indicate that microbial methanogenesis was the dominant driver for concretion growth,rather than bacterial sulfate ***,bitumen,and Fe-dolomite are the last cements that occurred,at deep burial depths and high *** formation of phosphate minerals might have been induced by upwelling of phosphate-enriched deep water in the Late Triassic paleo-lake,which promoted phytoplankton blooms and further enrichment of organic *** slow sedimentation rates of fine-grained detrital minerals,relative to dead organism accumulation,led to the high permeabilities of the organic-rich sediments and rapid concretion growth during shallow *** close association of phosphate-bearing carbonate concretions and organic-rich shales reflects that upwelling played a critical role in the formation of the high-quality petroleum source rocks in the Triassic paleo-Ordos lake.

关键词： carbonate concretion phosphate mineral upwelling paleoenvironment lacustrine source rock Ordos Basin

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Hydrocarbon Systems in the North-Eastern Area of the Song Hong Basin

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Journal of Earth Science and Engineering 2013年第12期3卷 807-814页

作者： Trinh Xuan Cuong Phan Ngoc Trung Tong Duy Cuong Nguyen Bich Ha Phung Lan Phtro'ng Hoang ThiLan Nguyen Hoang Son Vietnam Petroleum Institute Cdu giay Hanoi 10000 Vietnam Exploration and Production Centre Vietnam Petroleum Institute Cdu gidy Hanoi 10000 Vietnam

This paper reports some results of geo-scientific evaluation of the petroleum systems in the northeastern area of the Song Hong Basin offshore Vietnam. Geological-geophysical data, including regional studies, 2D and 3D seismic ＆ logging interpretation results as well as core/cutting samples analysis were integrated to reveals that the north-eastern area were controlled by pull apart activities along Song Hong river fault system, rifting phase during Eocene-Oligocene and subsidence during Miocene-Quaternary. Inversion activities at the end of Oligocene and late Miocene also play very important roles. These activities convert Pre-tertiary carbonate basement rocks to be potential reservoirs. The main source rock, overlying and adjacent to basement highs, was deposited in the lacustrine environment during rifting phase of Eocene and Oligocene and is still at the depth of oil generation window. The mentioned source rock layer is also considered as a good top seal for the basement. Petroleum system has been proven by the drilling and testing results and the studied area become more attractive and have higher chance of success.

关键词： Song Hong carbonate basement lacustrine source rock fracture oil generation.

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