鄂尔多斯盆地姬塬地区长7₁₊₂亚段夹层型页岩油差异富集主控因素

Main Controlling Factors of Differential Enrichment of Interlayer Oil of Submember 7₁₊₂ of Yanchang Formation in Jiyuan Area, Ordos Basin

摘要

为厘清夹层型页岩油富集的主控因素,根据烃源岩相对发育位置、储层与烃源岩的垂侧向关系,划分了鄂尔多斯盆地姬塬地区长7₁₊₂亚段夹层型页岩油的供烃方式,并利用油气显示井占比、油气充注厚度、油气充注强度与含油饱和度表征了不同供烃方式控制下的含油性,揭示了不同供烃方式控制下的夹层型页岩油差异富集特征.结果表明:鄂尔多斯盆地姬塬地区发育上下供烃型、底部供烃型、下部供烃型和侧向供烃型四种供烃类型;上下供烃型和侧向供烃型含油性较好,底部供烃型和下部供烃型次之.上下供烃型含油性取决于储集岩的储集能力,底部供烃型含油性受控于动阻力的配置关系,侧向供烃型含油性取决于连通烃源岩的砂体连通性,下部供烃型含油性受叠置砂体的裂缝密度影响大.

Abstract

To clarify the main controlling factors of interlayer oil enrichment, this study classifies hydrocarbon supply modes based on the spatial relationships between source rocks and reservoirs, including their relative development positions and vertical/lateral configurations. The oil-bearing properties under different hydrocarbon supply modes were characterized using indicators such as the proportion of oil-bearing wells, hydrocarbon charging thickness, charging intensity, and oil saturation, thereby revealing the differential enrichment characteristics of interlayer oil. The results show as follows. In the Jiyuan area of the Ordos basin, four types of hydrocarbon supply modes were identified: Vertical dual-source supply type, bottom source type, lower source type, and lateral source type. Among them, the vertical dual-source supply type and lateral source type exhibit superior oil-bearing properties, while the bottom source type and lower source type are comparatively less enriched. The oil content of the vertical dual-source supply types is primarily governed by the reservoir's storage capacity, whereas that of the bottom supply type is controlled by the interplay between dynamic forces and resistance. The oil content of the lateral source type depends on the connectivity of the sand bodies connecting the source rock, while the oil content of the lower supply type is significantly influenced by the fracture density of overlying sandstones.

关键词

供烃方式 / 夹层型页岩油 / 烃源岩 / 储层 / 富集机理 / 延长组长7段 / 鄂尔多斯盆地

Key words

hydrocarbon supply mode / interlayer oil / source rock / reservoir / enrichment mechanism / Member 7 of Yanchang Formation / Ordos basin

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基金资助

国家自然科学基金项目(42402152)

中国石油大学(北京)科研基金项目(2462023XKBH011)

中国石油天然气集团有限公司中国石油大学(北京)战略合作科技专项(ZLZX2020020103)