Differential evolution of extracted bitumen and solid bitumen in a hybrid shale system
文献类型：期刊论文
| 作者 | Ma, Weijiao3; Cao, Yingchang2,3; Xi, Kelai3; Liu, Keyu2,3; Liu, Jinzhong1 |
| 刊名 | ORGANIC GEOCHEMISTRY
 |
| 出版日期 | 2023-06-01 |
| 卷号 | 180页码:17 |
| 关键词 | Shale Extracted bitumen Solid bitumen Differential evolution Thermal maturity |
| ISSN号 | 0146-6380 |
| DOI | 10.1016/j.orggeochem.2023.104603 |
| 英文摘要 | Organic solvent extracted bitumen (EB) and microscopically observed solid bitumen (SB) carry many geological implications in unconventional source-rock reservoirs. EB is a commonly used term in organic geochemistry, and SB is normally used in organic petrology. Although both EB and SB are secondary organic matter initially formed from kerogen degradation and partially describe the same components, they are defined by different physical and chemical criteria and have specific applications, and thus are rarely comparatively investigated. In this study, by taking the shale of the seventh member of the Upper Triassic Yanchang Formation in the Ordos Basin, China, as a case study, we performed an integrated characterization on the two types of bitumen. The characterization was carried out on source rocks and reservoir assemblages at two scales: lamina-scale (organic-rich lamina and silty lamina) and lithofacies-scale (shale and sandstone). Programmed temperature pyrolysis (Rock-Eval 7 pyrolysis), gas chromatography-mass spectrometry (GC-MS), and Raman spectroscopy were used in this study. The samples are distributed within a 12 m interval and therefore should have experienced the same degree of thermal stress. However, maturity parameters derived from GC-MS for EB and Raman spectroscopy for SB exhibit a different inferred thermal maturity between source rocks and reservoirs at both lithofacies- and lamina-scales. The sidechain scission reactions related (non-)biomarker parameters such as Ts/C30H, sigma nC21_/sigma nC22+ alkanes, relative C21 + C22 sterane content and TA(I)/TA(I + II) suggest higher thermal maturity in source rocks (shale and organic-rich lamina) than the corresponding reservoirs (sandstone and silty lamina), while Raman-derived parameters RBS and G-FWHM indicate higher maturity in reservoirs than the corresponding source rocks. It is speculated that the EB measured by GC-MS comprises saturated and aromatic components corresponding to relatively mobile hydrocarbons. The maturation of the source rock exerts greater control over this component than that of the reservoir. In comparison, the SB measured using Raman spectroscopy mainly consists of solid residue left behind after migration and/or decomposition of a once-liquid oil phase that is less readily able to move. It is more intensely altered by the organic-inorganic interactions (mineral dissolution-precipitation processes) in the reservoir than that in the source rock, resulting in a consolidated SB with higher aromaticity. The storage ability of silty lamina in shale may complicate the data interpretation of geochemical differences in EB- and SB-derived parameters. On a practical note, when assessing thermal maturity, taking into the account the lithology or rock texture, which affects the organic-inorganic interactions, as well as specific components detected by different techniques may provide helpful clues to explain some contradictory results. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000981504400001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74246]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Cao, Yingchang; Xi, Kelai |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.Laoshan Lab, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 3.China Univ Petr East China, Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, Weijiao,Cao, Yingchang,Xi, Kelai,et al. Differential evolution of extracted bitumen and solid bitumen in a hybrid shale system[J]. ORGANIC GEOCHEMISTRY,2023,180:17. |
| APA | Ma, Weijiao,Cao, Yingchang,Xi, Kelai,Liu, Keyu,&Liu, Jinzhong.(2023).Differential evolution of extracted bitumen and solid bitumen in a hybrid shale system.ORGANIC GEOCHEMISTRY,180,17. |
| MLA | Ma, Weijiao,et al."Differential evolution of extracted bitumen and solid bitumen in a hybrid shale system".ORGANIC GEOCHEMISTRY 180(2023):17. |
入库方式： OAI收割
来源：广州地球化学研究所
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