烃类源内微运移对页理型页岩油差异富集的影响——以鄂尔多斯盆地三叠系延长组长73亚段为例

doi:10.3969/j.issn.1672-7703.2023.04.005

摘要/Abstract

摘要： 受陆相页岩多纹层类型、高密度纹层特征的影响，烃类源内差异微运移成为控制不同岩相页岩含油性及可动性的重要因素。以鄂尔多斯盆地10口系统取心井为对象，利用X-射线衍射、薄片观察、扫描电镜、氮气吸附、激光共聚焦、地球化学等分析测试手段，结合测井及试油资料，对三叠系延长组长7₃亚段页岩中烃类的微运移现象及微运移机理进行分析。研究发现页岩中富有机质纹层生成的原油普遍发生微米—毫米尺度的微运移，其中生烃增压提供了微运移动力；频繁发育的刚性纹层为微运移的烃类提供大量聚集空间；生烃增压缝—页理缝—微裂缝为微运移提供了通道；纹层矿物组成差异造成烃类分异。纹层的组合类型及差异微运移机理决定了长英质纹层页岩和凝灰质纹层页岩具有相对较好的含油性及可动性，是中—高成熟度页理型页岩油风险勘探的主要岩相类型。7口直井在长7₃亚段页岩中试油获10t/d以上的工业油流，证明长7₃亚段页岩段含油性好，水平井开发提产潜力大，有望成为鄂尔多斯盆地页岩油增储上产的接替领域。

关键词: 鄂尔多斯盆地, 页岩油, 长7₃亚段, 源内微运移

Abstract: Influenced by multi type and high density laminae of continental shale, the differential intrasource micro-migration of hydrocarbons is an important factor controlling the oil-bearing property and mobility of the laminated shale with various lithofacies. By taking the systematic shale coring sections in 10 wells in Ordos Basin as the research object and using laboratory experimental results such as XRD, thin section observation, SEM, nitrogen absorption, laser scanning confocal, geochemical test, as well as wireline logging and well testing results,the hydrocarbon micro-migration inside shale section in the third sub-member of the seventh member of the Triassic Yanchang Formation (referred to as Chang 7₃ sub-member) and the mechanism are analyzed. The study results show that the micro-millimeter scale migration generally occurred of crude oil generated by organic-rich laminated shale. Among them, hydrocarbon generation pressurization provided forces for micro-migration; The frequently developed brittle laminae provided a large amount of reservoir space for the micro migrated hydrocarbon; The hydrocarbon generation pressurization fractures, foliation fractures, and micro fractures provided pathways for micro-migration; The different mineral compositions of the laminae resulted in hydrocarbon differentiation. The combination type of laminae and differential micro-migration mechanism determine that the felsic laminated shale and tuffaceous laminated shale have relatively good oil-bearing property and mobility, which are the main lithofacies types for risk exploration of medium-high maturity laminated type shale oil. The commercial oil flow of more than 10 t/d was obtained in pilot test of Chang 7₃ sub-member shale in seven vertical wells, confirming that shale section in Chang7₃ sub member has good oil-bearing property, and there is a high potential of production increase by horizontal well development, which is expected to be a replacement field for reserve and production increase of shale oil in Ordos Basin.

中图分类号:

TE112

李士祥, 郭芪恒, 潘松圻, 周新平, 郭睿良. 烃类源内微运移对页理型页岩油差异富集的影响——以鄂尔多斯盆地三叠系延长组长7₃亚段为例[J]. 中国石油勘探, 2023, 28(4): 46-54.

Li Shixiang, Guo Qiheng, Pan Songqi, Zhou Xinping, Guo Ruiliang. Influence of intrasource micro-migration of hydrocarbons on the differential enrichment of laminated type shale oil: a case study of the third sub-member of the seventh member of the Triassic Yanchang Formation in Ordos Basin[J]. China Petroleum Exploration, 2023, 28(4): 46-54.

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烃类源内微运移对页理型页岩油差异富集的影响——以鄂尔多斯盆地三叠系延长组长7₃亚段为例

Influence of intrasource micro-migration of hydrocarbons on the differential enrichment of laminated type shale oil: a case study of the third sub-member of the seventh member of the Triassic Yanchang Formation in Ordos Basin

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