Tracer Research Methods for Hydrocarbon Substances in Shale Oil Reservoirs

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS Chemistry and Technology of Fuels and Oils Pub Date : 2024-03-19 DOI:10.1007/s10553-024-01671-4
Manfei Chen, Wenhao Tang, Li Wang, Xianda Sun, Nong Li, Jie Tan, Wenjin Zhang
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Abstract

Shale oil is currently a key area for unconventional oil and gas exploration and represents a new field to ensure national energy security. As a major contributor to unconventional oil and gas in China, Sichuan Basin has enormous potential as an oil and gas resource.The exploration of Jurassic shale oil reservoirs is in its infancy, with diverse reservoir lithology and the ability to store oil and gas. Therefore, whether the generated hydrocarbon substances in shale are still gathering in situ or have undergone short distance migration plays a guiding role in the formulation of the next oil and gas exploration and development plan. In this study, we focused on the shale oil reservoirs of Lianggaoshan Formation in northeastern Sichuan Basin. Firstly, the lithological characteristics of shale oil reservoirs, as well as the physical and geochemical characteristics of different lithological reservoirs were determined via core observations and conventional reservoir geological characteristic experiments. Secondly, Laser confocal scanning microscopy (LCSM) was used to conduct three-dimensional modeling and quantitative testing of the shale oil occurrence characteristics of different lithological reservoirs. Finally, based on the differences in the occurrence of hydrocarbons in different lithological reservoirs and the physical characteristics of rocks, hydrocarbon migration is traced.The following three insights were obtained based on the experimental results: The crude oil produced was primarily composed of light hydrocarbons.The physical properties of sandstone profiles are superior, with a higher proportion of light hydrocarbons compared to shale reservoirs.The above experimental results indicate that hydrocarbons generated in shale migrated over short distances and were enriched in adjacent sandstone and siltstone bands with relatively desirable physical properties. This study provides experimental means and data support for subsequent flowability evaluations and development plan preparation for Jurassic shale oil extraction in northeastern Sichuan.

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页岩油藏中碳氢化合物的示踪研究方法
页岩油是当前非常规油气勘探的重点领域,也是保障国家能源安全的新领域。四川盆地作为我国非常规油气的主要贡献区,油气资源潜力巨大。侏罗系页岩油藏勘探处于起步阶段,储层岩性多样,储藏油气能力强。因此,页岩中生成的烃类物质是仍在原地聚集还是发生了短距离迁移,对下一步油气勘探开发方案的制定具有指导作用。本研究以四川盆地东北部梁戈山地层页岩油藏为研究对象。首先,通过岩心观测和常规储层地质特征实验,确定了页岩油藏的岩性特征以及不同岩性储层的物理和地球化学特征。其次,利用激光共聚焦扫描显微镜(LCSM)对不同岩性储层的页岩油发生特征进行了三维建模和定量测试。最后,根据不同岩性储层中碳氢化合物发生的差异和岩石的物理特征,对碳氢化合物的迁移进行了追踪:生产的原油主要由轻烃组成。砂岩剖面的物理性质优于页岩储层,轻烃比例较高。上述实验结果表明,页岩中生成的碳氢化合物经过短距离迁移后,富集到物理性质相对理想的相邻砂岩和粉砂岩带中。该研究为后续川东北地区侏罗系页岩油开采流动性评价和开发方案编制提供了实验手段和数据支持。
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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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