岩性差异对泥页岩可压裂性的影响分析

doi:10.13278/j.cnki.jjuese.201604108

摘要/Abstract

摘要：

泥页岩的可压裂性是决定页岩油气能否有效开发的关键之一。由于沉积和成岩过程中的差异，常造成泥页岩在成分、结构、构造、成岩作用等方面存在明显的非均质性。可压裂性在本质上是泥页岩岩性特征的综合反映，所以泥页岩这些不同方面的岩性特征也就成了影响可压裂性的关键因素。本文通过分析岩石力学和工程力学的相关研究成果，结合实验数据，分析总结了泥页岩岩性因素对可压裂性的影响机理。认为尽管脆性矿物的含量是定性判断泥页岩可压裂性的重要依据，但长英质矿物作为脆性指标应该建立在中强成岩作用基础上；长英质颗粒或自生矿物晶粒大、形态复杂、分布密集、有序度高，有利于提高泥页岩的可压裂性；层理发育，纹层连续性强则会降低泥页岩的可压裂性；成岩作用强，矿物之间固结紧密，泥页岩的可压裂性也会增强。在泥页岩油气勘探开发过程中，必须注意岩性差异对泥页岩可压裂性的影响。

关键词: 岩性, 泥页岩, 可压裂性, 脆性, 差异

Abstract:

The fracturing of shale is one of the keys to determine whether the shale oil and gas can be effectively developed. The differences of deposition and diagenesis usually cause significant shale heterogeneity in composition, structure, construction, diagenesis, etc. Fracturing is an essential comprehensive reflection of lithological characteristics of shale, therefore these different aspects of shale lithology are critical to its fracturing properties. We analyzed and summarized the influence mechanism of shale lithologyon fracturing. The content of brittle mineral is a qualitative judgmentfor shale fracturing; Althoughfelsic minerals is regarded as a brittleness index, the conclusionshould also build on the basis of middle-strong diagenesis. Large felsic particles or authigenic mineralgrains are usually in complex shape and possess high degree oforder, which improves the fracturing property of shale. Shale fracturing will be reduced withwell-developed and strongly continued laminae, but enhanced with diagenesis and consolidation. In the process of shale oil and gas exploration and development, we must pay attention to the difference in lithology; as it can affect the fracturing of shale.

Key words: lithology, shale, fracturing, brittleness, difference

中图分类号:

P618.12

王冠民, 熊周海, 张婕. 岩性差异对泥页岩可压裂性的影响分析[J]. 吉林大学学报(地球科学版), 2016, 46(4): 1080-1089.

Wang Guanmin, Xiong Zhouhai, Zhang Jie. The Impact of Lithology Differences to Shale Fracturing[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(4): 1080-1089.

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