鄂尔多斯盆地长7段泥页岩层系排烃效率及其含油性

doi:10.11743/ogg20180308

摘要/Abstract

摘要：

泥页岩层系的排烃效率是当前页岩油气研究领域关注的重点问题之一，也是评价页岩油气资源潜力的关键参数。以鄂尔多斯盆地延长组长7段泥页岩层系为研究对象，通过系统地球化学分析，揭示了长7段泥页岩层系的排烃效率并探讨了泥页岩层系中不同岩性的含油性及其页岩油意义。中等成熟度阶段（R_o=0.8%），Ⅰ型有机质泥页岩的排烃效率在33%~37%，Ⅱ型排烃效率在16%~26%。成熟度较高阶段（R_o=1.1%），Ⅰ型有机质泥页岩的排烃效率在64%~67%，Ⅱ型排烃效率在54%~58%。在综合考虑不同类型岩性的含油性、滞留油族组分特征、气油比及滞留油流动性等地质因素后认为，成熟度较高的长7段泥页岩层系中（R_o=1.1%）游离烃含量和OSI指数高的砂岩段和粉砂质泥岩段等可作为页岩油勘探开发的有利目标。游离烃含量和OSI指数较高的块状泥岩段可作为页岩油勘探点潜在目标。黑色页岩段（或纯页岩段）因受若干地质因素的影响，可能会制约其成为研究区内页岩油勘探的有效目标。块状泥岩段可作为页岩油勘探的潜在目标；而黑色页岩（或纯页岩段）因受若干地质因素的影响，可能会制约其成为研究区内页岩油勘探的有效目标。

关键词: 排烃效率, 含油性, 泥页岩, 长7段, 鄂尔多斯盆地

Abstract:

Hydrocarbon expulsion efficiency of the shale system is one of the most important issues in the shale oil and gas research,and also a key parameter for evaluating the potential of shale oil and gas resources.This paper chooses the mud shale system from Chang 7 Member of the Yanchang Formation,Ordos Basin,as the investigation object.It measures the expulsion efficiency of the shale system and also reveals the variation of oil-bearing properties among various lithologies of mud shale system,via systematic geochemical analyses.Their significance in shale oil production is also discussed.The result shows that at the medium maturity stage (R_o=0.8%),the hydrocarbon expulsion efficiency of Type Ⅰ organic mud shale and Type Ⅱ mud shale is 33% to 37% and 16% to 26%,respectively,while at the mature stage (R_o=1.1%),the expulsion efficiency of Type Ⅰ and Type Ⅱ is 64% to 67% and 54% to 58%,respectively.Thus we conclude that in the shale system with higher maturity (R_o=1.1%), the sandstone and silty mudstone with higher free hydrocarbon content and OSI index can be the favorable targets for shale oil exploration and development; the blocky mudstone with high free hydrocarbon content and OSI index would be a potential target for shale oil exploration, with integrated consideration of geological factors including oil-bearing properties of different lithologies, composition characteristics, gas/oil ratio, and fluidity of retained oil. However, the black shale (or pure shale section) might not become an effective target for shale oil exploration in the study area, restrained by some of its geological factors.

Key words: hydrocarbon expulsion efficiency, oil-bearing property, shale, Chang 7 Member, Ordos Basin

中图分类号:

TE122.1

黄振凯,刘全有,黎茂稳,等. 鄂尔多斯盆地长7段泥页岩层系排烃效率及其含油性[J]. 石油与天然气地质, 2018, 39(3): 513-521,600. doi: 10.11743/ogg20180308 Huang Zhenkai,Liu Quanyou,Li Maowen,et al. Hydrocarbon expulsion efficiency and oil-bearing property of the shale system in Chang 7 Member,Ordos Basin[J]. Oil & Gas Geology, 2018, 39(3): 513-521,600. doi: 10.11743/ogg20180308

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