摘要
通过岩芯观察以及对普通薄片、铸体薄片、扫描电镜等资料的鉴定和分析,探讨了安岳地区须二段致密砂岩储层岩石学和物性特征、成岩作用、成岩阶段和成岩演化序列;基于不同成岩相的测井响应特征,利用自然伽马、声波时差、电阻率、密度和补偿中子孔隙度等常规测井参数建立了不同成岩相的测井识别标准,进而划分安岳地区各单井成岩相。结果表明:安岳地区须二段致密砂岩储层经历了压实、胶结等破坏性成岩作用和溶蚀、破裂等建设性成岩作用;根据成岩作用类型、成岩矿物及其对储层物性的影响,将储层划分为压实致密相、伊蒙混层充填相、碳酸盐胶结相、不稳定组分溶蚀相和成岩微裂缝相5种成岩相类型;结合试气资料,成岩微裂缝相常伴随构造裂缝的发育,含气性最好,而当没有裂缝的叠加作用时,不稳定组分溶蚀相含气性较好;成岩相特征、展布及其测井识别方法能有效评价致密砂岩储层并预测优质储集体发育带,为油气勘探提供地质依据。
According to the core observation and identification of normal thin section,casting thin section and scanning electron microscope,the petrologic characteristics,physical properties,diagenesis,diagenetic stage and diagenetic evolution sequence of tight sandstone reservoir in the second member of Xujiahe Formation（Xu-2Section）in Anyue area were discussed;according to the logging response characteristics of different diagenetic facies,the normal logging parameters including natural Gamma,acoustic,resistivity,density and compensated neutron porosity,etc.,were used to build logging recognition criteria of different diagenetic facies,and then the diagenetic facies of single well in Anyue area was divided.The results show that the tight sandstone reservoirs in Xu-2Section of Anyue area experience the destructive diagenesis including compaction and cementation,and constructive diagenesis including dissolution and fracture;based on type of diagenesis,diagenetic mineral and its effect on reservoir properties,thereservoirs are divided into compaction tight facies,illite and smectite mixed filling facies,carbonate-cemented facies,dissolution of unstable component facies and diagenetic microfracture facies;based on the gas testing data,the diagenetic microfracture facies has favorable gas potential and normally develops with structural fractures,and the dissolution of unstable component facies has good gas potential without the superposition of fracture;diagenetic facies characteristics,distribution and logging recognition method can effectively evaluate tight sandstone reservoirs and predict high quality reservoir bodies,providing geological basis for hydrocarbon exploration.
出处
《地球科学与环境学报》
CAS
2014年第3期38-51,共14页
Journal of Earth Sciences and Environment
基金
国家科技重大专项项目(2011ZX05020-008)
关键词
致密砂岩
成岩作用
测井识别
储集体
须家河组
安岳地区
四川
tight sandstone
diagenesis
logging recognition
reservoir body
Xujiahe Formation
Anyue area
Sichuan
