吉木萨尔凹陷芦一段页岩储集层孔隙结构及敏感性

doi:10.7657/XJPG20210504

摘要/Abstract

摘要：

为确定吉木萨尔凹陷芦草沟组一段页岩储集层敏感性,在明确矿物组成基础上,开展了储集层孔隙结构分析和敏感性物理模拟实验。芦一段储集层为陆源碎屑沉积,矿物组成复杂,黏土矿物含量高且以膨胀性矿物为主。储集层中脆性矿物含量高和孔隙结构复杂,加剧了应力敏感伤害;膨胀性黏土矿物含量高,加剧了水敏伤害;（铁）白云石与黏土矿物含量高,加剧了酸敏和碱敏伤害,但方解石含量高适当降低了酸敏伤害。总之,研究区芦一段页岩储集层具有中等—强应力敏感性和水敏性、弱—强酸敏性、弱—中等偏弱碱敏性,油田开发中应主要预防酸敏、水敏和应力敏感对储集层的伤害。

关键词: 吉木萨尔凹陷, 芦草沟组, 页岩储集层, 孔隙结构, 应力敏感性, 水敏性, 酸敏性, 碱敏性

Abstract:

In order to determine reservoir sensitivity of the shale in the first member of the Lucaogou formation (Lu 1 member for short) in Jimsar sag, we analyzed the pore structure and carried out physical simulation experiments on the reservoir sensitivity after understanding the reservoir mineral composition. The Lu 1 member reservoir belongs to terrigenous clastic deposits with complex mineral composition and rich clay minerals, most of which are swellable. The high content of brittle minerals and complex pore structures in the reservoir aggravated stress sensitive damage; the high content of swellable clay minerals increased water sensitive damage; the high contents of (iron) dolomite and clay minerals induced acid and alkali sensitive damage, but the high content of calcite slightly reduced acid sensitive damage. In conclusion, the Lu 1 member shale reservoir in the study area is moderately-strongly sensitive to stress and water, weakly-strongly sensitive to acid and weakly-approximately moderately sensitive to alkali. Reservoir sensitivity damages from acid, water and stress should be prevented in oilfield development.

Key words: Jimsar sag, Lucaogou formation, shale reservoir, pore structure, stress sensitivity, water sensitivity, acid sensitivity, alkali

中图分类号:

TE122.221

李晶晶, 孙国翔, 刘琦, 刘淼. 吉木萨尔凹陷芦一段页岩储集层孔隙结构及敏感性[J]. 新疆石油地质, 2021, 42(5): 541-547.

LI Jingjing, SUN Guoxiang, LIU Qi, LIU Miao. Pore Structure and Sensitivity of Shale Reservoir in Lu 1 Member of Jimsar Sag[J]. Xinjiang Petroleum Geology, 2021, 42(5): 541-547.

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