Compositional differences of near-critical petroleum from closed pores to wellhead in Gulong shale oil play, Songliao Basin, NE China
文献类型：期刊论文
| 作者 | Li, Ming3; Wang, Min3; Zhao, Chen3; Zhang, Jinyou2; Liu, Zhao2; Zhao, Xinbin3; Li, Jinbu1; Chen, Junyang3 |
| 刊名 | MARINE AND PETROLEUM GEOLOGY
 |
| 出版日期 | 2024-09-01 |
| 卷号 | 167页码:12 |
| 关键词 | Compositional differences High-maturity shale oil In-situ fluids Sequential extraction Compounds fractionation |
| ISSN号 | 0264-8172 |
| DOI | 10.1016/j.marpetgeo.2024.106968 |
| 英文摘要 | The Gulong shale oil play located in northern Songliao Basin is a promising exploration target in China. Member 1 of Qingshankou Formation (Well H) with high thermal maturity was preferred to obtain pressure-retained cores, long-time exposed cores, and produced petroleum (crude oil and gas). The selected samples were subjected to sequential extraction, GC, GC-MS, thermal desorption-gas chromatography (TD-GC) and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) analysis. The compositional differences of insitu fluids, residual bitumen trapped in open, confined, and closed pores, as well as wellstream, were systematically investigated. (1) In-situ fluid compositions, with a 30.8% proportion of nC1_ 5 in n-alkanes, were studied by TD-GC analysis on pressure-retained cores. Interestingly, limited amounts of C8- compounds were detected in long-time exposed bulk cores but were almost absent in exposed powder. Primally poor pore connectivity and partially adsorption or absorption of organic matter contribute to the retention of gaseous hydrocarbons. (2) Sequential extraction is a best method for obtaining compositions of fluid in pores with variable sizes. Aliphatic compounds of residual bitumen trapped in open pores are similar to those in confined pores, while polar compounds are more enriched in confined and closed pores. Originally connected pores in early oil window, has turned into confined or closed pores by compaction and cementation with increasing depth. (3) Wellstream compositions are significantly different from in-situ fluid compositions, especially in shale oil extraction. The proportion of gaseous hydrocarbons in the wellstream (76.2%) is considerably higher than that of in-situ fluids (34.1%). Comparison of aromatic hydrocarbons indicated that the wellstream is sourced from free fluids and partially adsorbed hydrocarbons in open pores. (4) Nitrogen and oxide compounds with a higher degree of condensation (higher DBE value) have poor movability, leading to extremely low content or even absence in crude oil. The compositional differences from in-situ fluids to the wellbore through the stimulated fractures are caused by selective adsorption of pore walls, confinement effect of nanopores and fluid phase changing. This study provides a window to the compositional differences of fluids released from different occurrence spaces and confirms compounds heterogeneity. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001347270000001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82070]  |
| 专题 | 中国科学院广州地球化学研究所 |
| 通讯作者 | Wang, Min |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.PetroChina, Daqing Oilfield Co Ltd, Explorat & Dev Res Inst, Daqing 163712, Peoples R China 3.China Univ Petr East China, State Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Ming,Wang, Min,Zhao, Chen,et al. Compositional differences of near-critical petroleum from closed pores to wellhead in Gulong shale oil play, Songliao Basin, NE China[J]. MARINE AND PETROLEUM GEOLOGY,2024,167:12. |
| APA | Li, Ming.,Wang, Min.,Zhao, Chen.,Zhang, Jinyou.,Liu, Zhao.,...&Chen, Junyang.(2024).Compositional differences of near-critical petroleum from closed pores to wellhead in Gulong shale oil play, Songliao Basin, NE China.MARINE AND PETROLEUM GEOLOGY,167,12. |
| MLA | Li, Ming,et al."Compositional differences of near-critical petroleum from closed pores to wellhead in Gulong shale oil play, Songliao Basin, NE China".MARINE AND PETROLEUM GEOLOGY 167(2024):12. |
入库方式： OAI收割
来源：广州地球化学研究所
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