川东南龙马溪组页岩孔隙演化特征研究

文章摘要

川东南龙马溪组页岩孔隙演化特征研究

Study on pore evolution of Longmaxi formation shale in southeastern Sichuan basin

投稿时间：2021-01-05 修订日期：2021-01-05

DOI：

中文关键词: 龙马溪组孔隙结构孔隙演化热模拟影响因素

英文关键词: longmaxi formation pore structure pore evolution thermal simulation influence factors

基金项目:重庆市自然科学基金重点项目“深层页岩气压裂复杂裂缝形成机理及工艺技术研究”(cstc2020jcyj-zdxmX0001)

作者	单位	邮编
胡微雪	中国石化股份华东分公司非常规油气资源实验中心	225007
刘洪^*	重庆科技学院	401331
靳雅夕	中国石化股份华东分公司非常规油气资源实验中心	225007
刘峰	中国石化股份华东分公司非常规油气资源实验中心	225007
范小俊	中国石化股份华东分公司非常规油气资源实验中心	225007
张蕾	中国石化股份华东分公司非常规油气资源实验中心	225007
陈建文	中国石化股份华东分公司非常规油气资源实验中心	225007

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中文摘要:

页岩气藏自生自储特点决定了页岩储层的储集空间与常规油气储层存在显著差异。本文从川东南彭水区块龙马溪组页岩的矿物组成、有机碳、Ro及扫描电镜图像等方面,研究了彭页A井龙马溪组最优质页岩段的五小层孔隙特征及其演化规律。从孔隙发育情况来看,有机孔主要发育在有机碳含量高的层位,同时受控于石英和粘土矿物的含量；整个优质页岩段,页岩的有机孔表现出从无到有、从小到大而又从大到小的过程。不同类型有机质的孔隙特征在热模拟实验过程中表现为收缩缝、海绵状有机孔、环带状有机孔、圆球状有机孔和黄铁矿晶间有机孔等五种类型。在页岩孔隙演化过程中,TOC含量控制着有机孔的宏观占比,Ro控制着有机孔发育的时机,有机质类型及其伴生矿物则是影响有机孔发育程度的主要因素。

英文摘要:

Because of the self-generation and self-storage characteristics of shale gas reservoir, the reservoir space of shale reservoir is significantly different from that of conventional oil and gas reservoir. In order to find out the pore characteristics and evolution law of the shale reservoir of Longmaxi formation in Pengshui Block, southeast Sichuan, from the aspects of mineral composition, organic carbon, Ro and sem images of the shale, the pore structure and its evolution of the five sublayers of the best quality shale member of Longmaxi formation in Pengye A well are studied. From the view of Pore Development, the organic pores are mainly developed in the horizon with high organic carbon content and controlled by the content of quartz and clay minerals, the organic pores of Shale show a process from scratch, from small to large and from large to small. The pore characteristics of different types of organic matter are shown as five types in the process of thermal simulation: Contraction Joint, sponge-like organic hole, ring-like organic hole, spherical organic hole and intercrystalline organic hole of pyrite. In the process of pore evolution, TOC content controls the macroscopical proportion of organic pores, Ro controls the timing of Pore Development, and the type of organic matter and its associated minerals are the main factors that affect the degree of pore development.

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