四川盆地威远地区龙马溪组泥页岩储层非均质性

发布时间：2018-01-05 21:10

本文关键词：四川盆地威远地区龙马溪组泥页岩储层非均质性　出处：《断块油气田》2016年04期 　论文类型：期刊论文

【摘要】：在详细调研前人研究成果的基础上,结合四川盆地威远地区的实际地质情况,将泥页岩储层的非均质性分为宏观非均质性、微观非均质性和岩石力学非均质性3个方面。泥页岩储层的宏观非均质性主要体现在储层的横向展布、垂向上的岩性变化以及裂缝的分布特征。下志留统龙马溪组海相优质页岩的有效厚度普遍大于30 m,横向上厚度变化较小,均质性相对较好;垂向上泥页岩中普遍含砂质和灰质,部分层段几乎为粉砂岩,垂向非均质性非常明显;储层中裂缝主要发育在龙马溪组底部层段,具有极强的非均质性。微观非均质性主要受矿物组分和成岩作用的控制,其矿物组分、微孔隙和微裂缝的发育特征具有非常明显的非均质性。岩石力学非均质性主要包括泊松比、弹性模量、脆性和应力各向异性,是决定后期水力压裂措施和页岩气产量的关键。综合研究认为,四川盆地及其周缘龙马溪组页岩横向均质性较好,垂向非均质性、储层裂缝发育特征、微观非均质性以及岩石力学非均质性明显,对后期页岩气井的压裂和采收率的提高有重要影响。
[Abstract]:On the basis of detailed investigation of previous research results, combined with the actual geological conditions in Weiyuan area of Sichuan Basin, the heterogeneity of shale reservoir is divided into macroscopic heterogeneity. Microcosmic heterogeneity and rock mechanics heterogeneity. The macroscopic heterogeneity of shale reservoir is mainly reflected in the lateral distribution of the reservoir. The effective thickness of marine high quality shale in Lower Silurian Longmaxi formation is more than 30 m, the lateral thickness change is small, and the homogeneity is relatively good. The vertical shales are generally sandy and lime-bearing, and some of the strata are siltstone, and the vertical heterogeneity is very obvious. The fractures in the reservoir are mainly developed in the bottom section of Longmaxi formation with strong heterogeneity. The microscopic heterogeneity is mainly controlled by mineral composition and diagenesis. The development characteristics of micropores and fractures are very obvious heterogeneity. The heterogeneity of rock mechanics mainly includes Poisson's ratio, elastic modulus, brittleness and stress anisotropy. It is the key to determine the later hydraulic fracturing measures and shale gas production. The comprehensive study shows that the shale lateral homogeneity, vertical heterogeneity and reservoir fracture development characteristics of Longmaxi formation in Sichuan Basin and its periphery are good. The microcosmic heterogeneity and the rock mechanics heterogeneity are obvious, which have an important effect on the fracturing and oil recovery of shale gas wells in the later stage.
【作者单位】：中国地质大学(北京)能源学院;中国石油新疆油田分公司风城油田作业区;中国石油新疆油田分公司准东采油厂;
【基金】：国家自然科学基金项目“页岩油、气甜点构成要素比较研究”(41472123)
【分类号】：P618.13
【正文快照】： 0引言随着页岩气资源开发的持续推进,页岩气储层非均质性研究的重要性也不断凸显,已成为提高页岩气采收率的关键和基础[1]。通过对北美已钻的大量页岩气井水平层段的测录井数据进行分析发现,其有机碳体积分数、矿物成分、岩石脆性、裂缝发育情况以及含气量等方面都存在明显的

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