渝东南下志留统龙马溪组页岩储集层成岩作用及其对孔隙发育的影响  

Shale reservoir diagenesis and its impacts on pores of the Lower Silurian Longmaxi Formation in southeastern Chongqing

作　　者：赵迪斐[1,2] 郭英海[1,2] 杨玉娟[1,2] 王守玉[1,2] 毛潇潇[1] 李咪[1,2] Zhao Difei Guo Yinghai Yang Yujuan Wang Shouyu Mao Xiaoxiao Li Mi(School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, Jiangsu Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, the Ministry of Education, China University of Mining and Technology, Xuzhou 221008, Jiangsu)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《古地理学报》2016年第5期843-856,共14页Journal of Palaeogeography：Chinese Edition

基　　金：国家重点基础研究发展计划(973)资助项目(编号:2012CB214702);煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目(编号:2015-007);中国矿业大学大学生创新训练项目(编号:201415;201517)~~

摘　　要：以重庆綦江、南川和涪陵地区的下志留统龙马溪组下部页岩样品为例,通过X射线衍射(XRD)、场发射扫描电镜、TOC测试、RO测试、高压压汞和低温氮吸附等手段,对研究区龙马溪组下部页岩储集层的矿物成分、有机组分、孔隙特征及成岩作用进行研究。实验结果表明,龙马溪组页岩成岩作用类型主要包括机械压实作用、化学压实作用、溶蚀作用、交代作用、破裂作用及矿物转化等,演化阶段介于晚成岩作用与极低级变质作用之间;成岩作用对页岩储集层的孔渗特征、孔隙成因类型、非均质性和形貌特征均有显著影响。对成岩作用与孔隙演化进行了匹配,认为机械/化学压实作用、溶蚀作用及过程中的有机生烃、矿物转化对孔隙发育影响最为显著,并将储集层成岩作用划分为溶蚀作用等建设性成岩作用与压实作用等破坏性成岩作用。Taking shale samples of the Lower Silurian Longmaxi Formation from Qijiang,Nanchuan and Fuling Areas as an example,the mineral compositions,organic characteristics,pore characteristicsand reservoir diagenesis were studied by XRD,mercury intrusion,field emission scanning electron microscopy,TOC test,ROtest and low temperature nitrogen adsorption,etc. The results show that the reservoir diagenesis of the Lower Silurian Longmaxi Formation includes mechanical compaction,chemical compaction,dissolution,metasomatism, regmagenesis, mineral transformation, etc.; the diagenetic phase lies between late diagenesis and low-grade metamorphism; reservoir diagenesis show great impaction on porosity,permeability,formation mechanism,pore size distribution,heterogeneity and morphological characteristics. Mechanical / chemical compaction, dissolution, the evolution of organic matter and mineral transformation during the process had great influence on pores＇ development and the reservoir diagenesis were divided into two types as constructive diagenesis（ dissolution, etc.） and destructive diagenesis（ compaction,etc.） by matching the process of reservoir diagenesis with the development of pores.

关 键 词：页岩气 储集层成岩作用 孔隙特征 龙马溪组 志留系 渝东南 

分 类 号：TE122.221[石油与天然气工程—油气勘探]