Geochemical properties, mechanism of formation, and source of solid bitumen in the Ediacaran Dengying Formation from the central to northern Sichuan Basin, China
文献类型：期刊论文
| 作者 | Fang, Xinyan1,4,5; Deng, Bin2; Geng, Ansong1,4; Liu, Shufen1,4,5; Wang, Pufan1,5; Liang, Xiao3; Li, Yun1,4 ; Cheng, Bin1,4; Jiang, Wenmin1,4; Wu, Liangliang1,4
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| 刊名 | MARINE AND PETROLEUM GEOLOGY
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| 出版日期 | 2024 |
| 卷号 | 159页码:19 |
| 关键词 | Sichuan basin North slope area Genetic analysis Bound biomarkers Trace elements |
| ISSN号 | 0264-8172 |
| DOI | 10.1016/j.marpetgeo.2023.106573 |
| 英文摘要 | Several large gas reservoirs, including the Weiyuan and Anyue gas fields, have been discovered in the Ediacaran Dengying Formation in the Sichuan Basin, indicating vast opportunities for deep-petroleum exploration. Understanding the origin and evolution process of these gas reservoirs is crucial for further petroleum exploration and development. Although the burial history of the Sichuan Basin and its surrounding areas is basically dominated by Paleozoic burial and preservation, and Meso-Cenozoic uplift and erosion. However, the source of the Dengying Formation natural gas in the Sichuan Basin is still a subject of controversy between the Ediacaran and Cambrian source rocks due to high thermal maturity, secondary alteration, and multistage tectonic activities. This study aims to examine the investigation on the properties and genetics of Dengying solid bitumens that existed in the central to northern Sichuan Basin, in order to provide insights into the source and evolution history of the Dengying paleo-oil reservoirs. For this purpose, petrologic, elemental, and organic geochemical analyses were used to investigate the properties, origin, and formation mechanism of solid bitumens. The results indicate that these solid bitumens have suffered intense thermal alteration (EqVRo 2.1%-5.3%), and are classified as pyrobitumens. Solid bitumens in the Gaoshiti bulge and the north slope area were subjected to tectonic thermal events (e.g., Emeishan igneous province) and relatively strong thermochemical sulfate reduction (TSR) alteration. These solid bitumens were assumed to be pyrolysis products of light (condensate) oil. In contrast, solid bitumens in the Weiyuan bulge and the Micangshan uplift area were not influenced by tectonic thermal events but experienced weak TSR alteration, and originated from either normal or heavy crude oil. Moreover, a systematic bitumen-source correlation was carried out using delta 13Corg values, bound steranes, and trace element distributions. Results reveal that the solid bitumens in the central Sichuan paleo-uplift were mainly derived from the lower Cambrian Maidiping Formation, those in the north slope area originated from the lower Cambrian Qiongzhusi Formation, while those in the Micangshan area were sourced from the Ediacaran Doushantuo Formation. Structural and burial history analysis implies that the differences in the source of the Dengying paleo-oil reservoir (i.e., solid bitumen) between these study areas are attributed to the distribution of source rocks and their contact relationship with reservoirs. This research successfully obtained insights into the source and genetic mechanism of paleo-oil reservoirs by analyzing the properties of high-maturity solid bitumens, which can guide further exploration and development of deep petroleum resources. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001112229300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79118]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Wu, Liangliang |
| 作者单位 | 1.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Chengdu Univ Technol, Chengdu 610059, Peoples R China 3.CNPC, CCDC Geol Explorat & Dev Res Inst, Chengdu 610051, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fang, Xinyan,Deng, Bin,Geng, Ansong,et al. Geochemical properties, mechanism of formation, and source of solid bitumen in the Ediacaran Dengying Formation from the central to northern Sichuan Basin, China[J]. MARINE AND PETROLEUM GEOLOGY,2024,159:19. |
| APA | Fang, Xinyan.,Deng, Bin.,Geng, Ansong.,Liu, Shufen.,Wang, Pufan.,...&Wu, Liangliang.(2024).Geochemical properties, mechanism of formation, and source of solid bitumen in the Ediacaran Dengying Formation from the central to northern Sichuan Basin, China.MARINE AND PETROLEUM GEOLOGY,159,19. |
| MLA | Fang, Xinyan,et al."Geochemical properties, mechanism of formation, and source of solid bitumen in the Ediacaran Dengying Formation from the central to northern Sichuan Basin, China".MARINE AND PETROLEUM GEOLOGY 159(2024):19. |
入库方式： OAI收割
来源：广州地球化学研究所
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