摘要
通过物性分析、铸体薄片、X衍射及扫描电镜等测试方法,对北部湾盆地福山凹陷花场—白莲地区流沙港组的岩石学特征、成岩作用和储层物性等影响因素进行分析。结果表明,研究区储层岩石类型以长石质岩屑砂岩和岩屑砂岩为主,孔隙类型以溶蚀孔隙为主,属中孔、低渗透储层;主要成岩作用类型有压实作用、石英次生加大、自生粘土矿物胶结作用和溶蚀作用等,其中压实作用是造成研究区砂岩原生孔隙大量丧失的主要原因,而溶蚀作用产生的次生孔隙则使储层物性得以改善;研究区储层原始孔隙度中等,后期成岩作用改造强烈,目前处于晚成岩阶段A期。通过综合构造、沉积和成岩作用等分析认为,花场—白莲地区流沙港组的有利储层主要为辫状河三角洲前缘相对较高部位的砂体。
The petrologic characteristics, diagenesis and major controlling factors of reservoir quality of the Liushagang formation in Huachang-Bailian area, Fushan depression, Beibuwan basin are analyzed by means of physical properties analysis, casting thin-section, X-ray diffraction and SEM. This study shows that the reservoir of Liushagang formation, characterized by litharenite and lithic sandstone, is low porous and permeable with dissolved intergranular and intragranular pore as the main pore type and then the residual primary pore. The reservoir in research area is mainly affected by combined factors of depositional environment and diagenesis, whose original porosity is medium and strongly reformed by later diagenesis. Currently, the Liushagang reservoir is at late diagenetic phase A.The main diagenesis types in Liushagang reservoir are compaction, secondary, enlargement of quartz and cementation of authigenic clay mineral, etc. It is the compaction that reduces the primary pore space in Liushagang reservoirs, while dissolution generated secondary porosity that improves reservoir quality. By comprehensive analysis of the structure, deposition, diagenesis, the result shows that the favorable reservoir in the Fushan depression is mainly distributed in the relatively higher parts of braided deha front sandbodies.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第2期21-24,29,共5页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目"奥陶纪--志留纪转折期扬子海氧化还原环境变化"(40903032)
关键词
流沙港组
成岩作用
储层物性
福山凹陷
北部湾盆地
Liushagang formation
diagenesis
reservoir property
Fushan depression
Beibuwan basin
