Geochemical Characteristics of the Chang 7 Source Rocks of the Triassic Yanchang Formation in Ordos Basin, China: Implications for Organic Matter Accumulation and Shale Oil Potential
文献类型：期刊论文
| 作者 | Hao, Lewei1; Ma, Xiaofeng1; Gao, Wenqiang1,2; Ren, Zhaocai3; Tao, Huifei1; Huang, Weikai1,4 |
| 刊名 | ENERGIES
 |
| 出版日期 | 2022-10-01 |
| 卷号 | 15期号:20页码:20 |
| 关键词 | source rocks organic matter accumulation shale oil potential Yanchang Formation Ordos Basin |
| DOI | 10.3390/en15207815 |
| 英文摘要 | The Chang 7 member of the Upper Triassic Yanchang Formation in the Ordos Basin is considered to hold the main source rocks for conventional and unconventional oil and gas. The lamination or lithology alteration in vertical and lateral directions, even over a short distance, is a common feature in lacustrine source rocks. The differences in the geochemical characteristics of black shales, dark mudstones and interbedded sandstones have been scarcely reported, and their influences on the petroleum generation potential and shale oil potential are not clear. To this end, 22 core samples were collected from the Lower and Middle Chang 7 (C7-3 and C7-2) members of the Triassic from well CYX in the Qingcheng area. By conducting a series of geochemical analyses including TOC, Rock-Eval pyrolysis yields, bitumen extraction and quantification, and the separation and quantification of saturates, aromatics, resins and asphaltenes, along with biomarker analyses, several results were found. Firstly, the C7-3 and C7-2 source rocks are thermally mature and have entered into the stage of hydrocarbon generation. The C7-3 and C7-2 source rocks have a good to very good hydrocarbon generation potential especially the C7-3 black shales. Secondly, terrigenous source input is more abundant in C7-2, whereas the source input of phytoplankton, algae or microbial lipids is more abundant in C7-3. Moreover, a high TOC content basically corresponds to low wax indexes, terrigenous/aquatic ratios (TARs), and Pr/nC(17) and Ph/nC(18) ratios and high C-27/C-29 regular sterane ratios, which suggests that the source input of phytoplankton, algae or microbial lipids is favorable for OM accumulation. Third, analyses of the molecular composition of saturated fractions in shales and interbedded sandstones and the production index demonstrate the migration of petroleum from organic-rich source rocks to their organic-lean counterparts. The C7-2 dark mudstones could be considered as a potential "sweet spot" since their oil saturation index (OSI) was the highest among all the studied samples and they are more enriched in light aliphatic fractions. |
| WOS关键词 | SEDIMENTATION-RATE ; PRIMARY MIGRATION ; LACUSTRINE SHALE ; PETROLEUM ; CARBON ; MARINE ; HYDROCARBONS ; MATURATION ; GENERATION ; EXPULSION |
| 资助项目 | National Natural Science Foundation of China[41802160] |
| WOS研究方向 | Energy & Fuels |
| 语种 | 英语 |
| 出版者 | MDPI |
| WOS记录号 | WOS:000872650800001 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/107745]  |
| 专题 | 地质与地球物理研究所_兰州油气中心 |
| 通讯作者 | Ma, Xiaofeng; Gao, Wenqiang |
| 作者单位 | 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730030, Peoples R China 2.Lanzhou City Univ, Bailie Sch Petr Engn, Lanzhou 730070, Peoples R China 3.PetroChina Changqing Oilfield Co, Explorat & Dev Res Inst, Xian 710018, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hao, Lewei,Ma, Xiaofeng,Gao, Wenqiang,et al. Geochemical Characteristics of the Chang 7 Source Rocks of the Triassic Yanchang Formation in Ordos Basin, China: Implications for Organic Matter Accumulation and Shale Oil Potential[J]. ENERGIES,2022,15(20):20. |
| APA | Hao, Lewei,Ma, Xiaofeng,Gao, Wenqiang,Ren, Zhaocai,Tao, Huifei,&Huang, Weikai.(2022).Geochemical Characteristics of the Chang 7 Source Rocks of the Triassic Yanchang Formation in Ordos Basin, China: Implications for Organic Matter Accumulation and Shale Oil Potential.ENERGIES,15(20),20. |
| MLA | Hao, Lewei,et al."Geochemical Characteristics of the Chang 7 Source Rocks of the Triassic Yanchang Formation in Ordos Basin, China: Implications for Organic Matter Accumulation and Shale Oil Potential".ENERGIES 15.20(2022):20. |
入库方式： OAI收割
来源：地质与地球物理研究所
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