川东南林滩场地区五峰组-龙一段页岩储层特征及含气性影响因素

Shale reservoir characteristics and gas-bearing influencing factors of Wufeng Formation-Long 1 Member in Lintanchang Area, Southeast Sichuan

摘要

以川东南林滩场地区五峰组-龙马溪组一段（龙一段）富有机质页岩为研究对象，采用 X 线衍射全岩矿物分析、干酪根镜检、镜质体反射率、孔隙度、含气性、微量元素测试和测井解释等方法，分析页岩储层有机地球化学、孔隙结构和储集物性等含气性影响因素。结果表明：林滩场地区五峰组-龙一段划分 9 个小层，主要岩性为黑色炭质笔石页岩夹粉砂岩，干酪根类型以I型为主，有机质成熟度介于 3.27 \mathrm{\%} \sim 3.47 \mathrm{\%} , w \left( \mathrm{T} \mathrm{O} \mathrm{C} \right) 介于 0.58 \mathrm{\%} \sim 6.43 \mathrm{\%} ，孔隙度介于 0.52 \mathrm{\%} \sim 10.81 \mathrm{\%} ，渗透率介于 ( 0.002 \sim 0.684 ) \times {10}^{-3} \mu {\mathrm{m}}^2 ，含气量介于 1.12 \sim 3.8 5 {\mathrm{m}}^3 / \mathrm{t} ；沉积环境整体为深水陆棚相过渡到浅水陆棚相，气候湿热，为缺氧还原环境，储层物性好。页岩气探井效益开发最有利的埋深为 2.0 \sim 3.0 \mathrm{k} \mathrm{m} ，林滩场南区埋深在 2.5 \sim 4.0 \mathrm{k} \mathrm{m} 之间，埋深较为适中；页岩气井与断裂距离大于 1.2 km ，气井测试产量与断裂距离成正比。林页 1 井附近 2.0 km 范围内发育 5 条大尺度断裂，林页 3 井附近 2.0 km 范围内发育 1 条中尺度断裂，林页 3 井测试产量高于林页 1 井的。该结果为川东南复杂构造区页岩储层勘探开发提供指导。

Abstract

Taking the organic-rich shale of Wufeng Formation-Long 1 Member in Lintanchang Area, Southeast Sichuan as the research object. By means of X-ray diffraction mineral analysis, kerogen microscopic examination, vitrinite reflectance, porosity, gas-bearing property, trace element test and logging interpretation, a comprehensive study is carried out to analyze the influencing factors of gas-bearing property of shale reservoirs. The research results show that the main lithology of Wufeng FormationLong 1 Member in Lintanchang Area is black carbonaceous graptolite shale mixed with siltstone, which is divided into 9 sub-layers. The kerogen type is mainly type I, with R_o ranging from 3.27% to 3.47%, TOC ranging from 0.58% to 6.43%, porosity ranging from 0.52% to 10.81% and permeability ranging from 0.002×10^-3 to 0.684 \times {10}^{-3} \mu {\mathrm{m}}^2. The gas content is between 1.12 and 3.85 m³/t. The sedimentary environment as a whole is a transition from deep-water shelf facies to shallow-water shelf facies, with hot and humid climate, anoxic reduction environment and good reservoir properties. The most favorable burial depth for the benefit development of shale gas exploration wells is 2.0-3.0 km, and the burial depth in the south area of Lintanchang is 2.5-4.0 km, indicating that the burial depth is moderate. The distance between shale gas well and fault is more than 1.2 km, and the test production of gas well is proportional to the fault distance. The actual exploration shows that there are five large-scale faults in the range of 2.0 km near well LY1, but only one medium-scale fault in the range of 2.0 km near well LY3, so the test production of well LY3 is higher than that of well LY1. This study provides some guidance and reference for the exploration and development of shale reservoirs in complex structural areas of Southeastern Sichuan.

关键词

储层特征 / 含气性 / 影响因素 / 页岩 / 五峰组-龙一段 / 林滩场地区 / 川东南

Key words

reservoir characteristics / gas-bearing / influencing factors / shale / Wufeng Formation-Long 1 Member / Lintanchang Area / Southeast Sichuan

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基金资助

国家自然科学基金企业创新发展联合基金项目(U19B6003)