鄂尔多斯盆地甘泉地区长7页岩油储层非均质性及其控油规律

doi:10.3969/j.issn.1006-6535.2023.04.002

摘要/Abstract

摘要： 为揭示鄂尔多斯盆地伊陕斜坡东南部甘泉地区长7油层组页岩油储层的宏观非均质性及其对石油分布的控制作用,通过隔夹层识别统计、渗透率统计及劳伦兹曲线构建等方法,定量表征并比较了长7₁、长7₂油层亚组的宏观非均质性,利用相关分析和多因素叠合的方法,分析了宏观非均质性对石油分布的影响。研究结果表明:研究区长7₁、长7₂页岩油储层平均发育夹层数分别为3.8、5.1层,砂体渗透率以复合韵律为主,且非均质性强;平均发育隔层数分别为3.4、2.8层,单隔层的平均厚度分别为6.0、4.9 m;长7₁较长7₂表现为稍弱的层内非均质性和较强的层间非均质性。页岩油砂岩储层的韵律性对含油饱和度有明显的影响,厚度大于10.0 m的隔层对油气有明显的封盖作用,“物性”隔夹层则构成油气聚集的侧向遮挡。长7₁油层亚组较长7₂油层亚组隔层更为发育,而长7₂油层亚组油气更富集。平面上,油气富集区分布呈条带状,多位于砂体厚度大且连续性较好、渗透率大于0.2 mD的区域,顺河道砂体延伸的方向上油层厚度变化小,垂直河道延伸方向上变化较大。研究结论可为鄂尔多斯盆地伊陕斜坡东南部长7夹层式页岩油有利区评价及开发参数优选提供理论参考。

关键词: 储层非均质性, 隔夹层, 页岩油, 长7油层组, 鄂尔多斯盆地

Abstract: To reveal the macro heterogeneity of shale oil reservoirs in the Chang 7 oil reservoir formation, Ganquan area in the southeastern part of the Yishan Slope, Ordos Basin and its control on oil distribution, the macro heterogeneity of the Chang 7₁ and Chang 7₂ oil reservoir sub-formations was quantitatively characterized and compared by means of barrier bed and interbed identification statistics, permeability statistics and Lorenz curve construction, and the influence of macro heterogeneity on oil distribution was analyzed by the method of correlation analysis and multifactor overlay. The results of the study show that the average number of interbeds developed in the Chang 7₁ and Chang 7₂ shale oil reservoirs in the study area is 3.8 and 5.1 respectively, and the permeability of the sand body is dominated by composite rhyme and is strongly heterogeneous; the average number of barrier beds developed is 3.4 and 2.8 respectively, and the average thickness of single barrier bed is 6.0 and 4.9 m respectively; Chang 7₁ exhibits slightly weaker intra-layer heterogeneity and stronger inter-layer heterogeneity than Chang 7₂. The rhythmicity of the shale oil sandstone reservoir has obvious influence on the oil saturation, and the barrier bed with thickness greater than 10.0 m have obvious capping effect on oil and gas, while the "physical" barrier beds and interbeds constitute lateral shielding for oil and gas accumulation. The barrier bed is more developed in Chang 7₁ than Chang 7₂, and the oil and gas are more abundant in Chang 7₂. In the plane, the distribution of oil-gas accumulation area is strip-like, mostly located in the area with large sand thickness, good continuity and permeability of greater than 0.2 mD.The thickness of oil layer varies slightly in the direction of sand body extension along the river, but varies more in the direction of vertical river extension. The conclusion of the study can provide theoretical reference for the evaluation of the favorable area and the selection of development parameters for the Chang 7 sandwich type shale oil in the southeastern part of the Yishan slope of Ordos Basin.

Key words: reservoir heterogeneity, barrier bed and interbed, shale oil, Chang 7 oil reservoir formation, Ordos Basin

中图分类号:

TE122

钟红利, 卓自敏, 张凤奇, 张佩, 陈玲玲. 鄂尔多斯盆地甘泉地区长7页岩油储层非均质性及其控油规律[J]. 特种油气藏, 2023, 30(4): 10-18.

Zhong Hongli, Zhuo Zimin, Zhang Fengqi, Zhang Pei, Chen Lingling. Heterogeneity of Chang 7 Shale Oil Reservoir and Its Oil Control Law in Ganquan Area, Ordos Basin[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 10-18.

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