Effects of post-oil bitumen on the nanopore development of shales: New insights from a stepwise thermal simulation experiment on small shale plug samples
文献类型：期刊论文
| 作者 | Fan, Qizhang2; Cheng, Peng1,4; Gai, Haifeng1,4; Yu, Zhenfeng3; Meng, Guangming2; Xiao, Xianming2 |
| 刊名 | MARINE AND PETROLEUM GEOLOGY
 |
| 出版日期 | 2024-10-01 |
| 卷号 | 168页码:16 |
| 关键词 | Post-oil bitumen Nanopore development Pyrolysis experiment Kerogen type Oil expulsion efficiency |
| ISSN号 | 0264-8172 |
| DOI | 10.1016/j.marpetgeo.2024.107038 |
| 英文摘要 | The development of organic matter-hosted (OM) pores in shales is a key factor affecting the distribution and enrichment of shale gas. Although the post-oil bitumen in shale significantly influences the development of OM pores, the development model and mechanism of OM pores with respect to post-oil bitumen are still not fully understood at present. In this study, a stepwise thermal simulation experiment was innovatively performed on small shale plug samples with Type IIa and IIb kerogen. Shale samples with different contents of post-oil bitumen were initially obtained by an oil generation and expulsion experiment. Then, these shales were used for a gas generation experiment. The results show that the post-oil bitumen of shales occupies/blocks original nanopores. It primarily affects pore structure by releasing occupied/blocked pore space and/or generating new pores within itself with increasing maturity. The influence of post-oil bitumen on the development of nanopores varied at different maturity stages. When Ro < 2.6%, the presence of post-oil bitumen in the shales reduces their pore spaces, especially the micropore spaces, and the decrease in pore space is greater for Type IIb shales than for Type IIa shales and is similar for the shales with different oil expulsion efficiencies (OEEs). When Ro > 2.6%, except for the micropore spaces of the shales with a low OEE, the occupied/blocked nanopore spaces of the other shales with different OEEs progressively decrease with increasing maturity. The presence of post-oil bitumen in shales enlarges the nanopore spaces of shales, especially the non-micropores with pore widths of 2-10 nm, and the increase in pore space is greater for Type IIb shales than for Type IIa shales. In addition, at the stages with Ro values of 2.03-2.83%, the contributions of post-oil bitumen to nanopore development progressively increased with increasing maturity, and the impacts on non-micropores occurred earlier than those on micropores. However, when Ro < 2.03% and Ro > 2.83%, the effects of post-oil bitumen on nanopore development barely vary with increasing maturity. The results of this study may have significance for revealing the nanopore development model and mechanism of post-oil bitumen in shales and provide a new theoretical basis for accurately evaluating the pore characteristics of shales. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001289188400001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78690]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Cheng, Peng |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China 3.Shanxi Blue Flame Coalbed Methane Engn Res Co LTD, Jincheng 048026, Peoples R China 4.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fan, Qizhang,Cheng, Peng,Gai, Haifeng,et al. Effects of post-oil bitumen on the nanopore development of shales: New insights from a stepwise thermal simulation experiment on small shale plug samples[J]. MARINE AND PETROLEUM GEOLOGY,2024,168:16. |
| APA | Fan, Qizhang,Cheng, Peng,Gai, Haifeng,Yu, Zhenfeng,Meng, Guangming,&Xiao, Xianming.(2024).Effects of post-oil bitumen on the nanopore development of shales: New insights from a stepwise thermal simulation experiment on small shale plug samples.MARINE AND PETROLEUM GEOLOGY,168,16. |
| MLA | Fan, Qizhang,et al."Effects of post-oil bitumen on the nanopore development of shales: New insights from a stepwise thermal simulation experiment on small shale plug samples".MARINE AND PETROLEUM GEOLOGY 168(2024):16. |
入库方式： OAI收割
来源：广州地球化学研究所
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