摘要
深层页岩气资源丰富,勘探开发潜力大,但在复杂地质演变过程中,其储层物质组成、力学性质和相态赋存等发生了变化,具有一定特殊性,对储层孔隙发育产生重要影响。以四川盆地泸州区块五峰组—龙马溪组深层页岩为例,基于储层物质组成和孔隙结构表征等实验,获取储层的物质组成和储集空间特征,研究储层物质演化规律及其孔隙贡献。结果表明:①垂向上由浅至深,五峰组—龙马溪组页岩有机质含量先增高后降低;储层矿物组成以石英和黏土矿物为主,其他矿物包括长石、碳酸盐矿物和黄铁矿。②龙马溪组有机质孔隙贡献随埋藏深度增加总体上表现出增大的趋势,至五峰组孔隙贡献随埋深增加而减小,黏土矿物孔隙贡献变化趋势与有机质相反。③石英及黄铁矿等质地坚硬的矿物具有“抗压保孔”作用,是五峰组—龙马溪组底部有机质孔隙保存的关键因素。④区内五峰组上部—龙一1亚段是研究区内开发优质层段,其中五峰组上部—龙一13小层为Ⅰ类储层。为实现经济开发,建议针对深层储层高温压和大抗拉强度等特点,优化压裂技术方案。
The deep shale gas is rich in resources and has great potential for exploration and development.However,in the process of complex geological evolution,the material composition,mechanical properties and phase occurrence of the reservoir have changed,which has certain particularity and an important influence on the development of reservoir pores.Taking the deep shale of Wufeng-Longmaxi formations in Luzhou block as an example,based on the experiments of reservoir material composition and pore structure characterization,this paper obtained the material composition and space characteristics of the reservoir,and studied the evolution law and the pore contribution of reservoir material.The results show that:(1)Vertically,from shallow to deep,the organic matter content of Wufeng-Longmaxi formations shale increases firstly and then decreases,the content of brittle minerals increases while the content of clay minerals decreases.(2)The pore contribution of organic matter in Longmaxi Formation increases with the increase of burial depth,but decreases with the increase of burial depth in Wufeng Formation.The change trend of the pore contribution of clay minerals is opposite to that of organic matter.(3)The hard minerals,such as quartz and pyrite,have the function of“anti-compaction and pore preservation”,and are the key factors for the preservation of organic matter pores in the bottom of Wufeng-Longmaxi formations.(4)The upper part of Wufeng Formation-1st submember of 1st Member of Longmaxi Formation(Long11 submember)is a high-quality reservoir in the study area,in which the upper part of Wufeng Formation-3 sublayer of Long11 submember is a type I reservoir.In order to realize economic development,it is suggested to optimize the fracturing technology scheme according to the characteristics of high temperature and pressure in deep reservoir and high tensile strength of rock.
作者
吴建发
赵圣贤
张瑛堃
夏自强
李博
苑术生
张鉴
张成林
何沅翰
陈尚斌
WU Jianfa;ZHAO Shengxian;ZHANG Yingkun;XIA Ziqiang;LI Bo;YUAN Shusheng;ZHANG Jian;ZHANG Chenglin;HE Yuanhan;CHEN Shangbin(Shale Gas Research Institute of Southwest Oil and Gasfield Company of CNPC,Chengdu 610056,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of the Ministry of Education on Coalbed Methane Resources and Accumulation Process,Xuzhou 221116,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2022年第4期642-653,共12页
Natural Gas Geoscience
基金
国家自然科学基金“海相页岩储层黏土矿物甲烷吸附贡献及其动态模型”(编号:41772141)
中国石油股份有限公司重大科技专项“深层页岩气有效开采关键技术攻关与试验”(编号:2019F-31)联合资助。
关键词
深层页岩气
物质组成
孔隙贡献
泸州区块
Deep shale gas
Material composition
Pore contribution
Luzhou block
