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通过岩心观察、粒度及测井分析并结合区域沉积背景等资料,开展了丰富川油田西部延长组长6储层储层特征与成岩作用。研究区长6储层为三角洲平原亚相及三角洲前缘亚相沉积,砂体主要分布于水上分流河道及水下分流河道微相。借助铸体薄片分析、扫描电镜等分析手段,对储层岩石学特征及成岩作用特征的进行分析,认为研究区延长组经历了强烈压实、较强胶结、较强溶蚀等成岩作用。机械压实作用、矿物胶结作用均为破坏性成岩作用,溶蚀作用为建设性成岩作用,改善了地层孔隙。
Through core observation, particle size and well logging analysis combined with regional sedimentary background data, reservoir characteristics and diagenesis of Chang 6 reservoir of Yanchang Formation in western Sichuan Oilfield are enriched. The reservoir of Chang 6 in the study area is sedimentary facies of delta plain and delta front. The sand body is mainly distributed in water distributary channel and underwater distributary channel microfacies. By means of analysis of thin slab and scanning electron microscope, the petrological characteristics and diagenetic characteristics of the reservoirs are analyzed. It is concluded that the Yanchang Formation in the study area experienced diagenesis such as strong compaction, strong cementation and strong dissolution. Mechanical compaction and mineral cementation are both destructive diagenesis, and dissolution is a constructive diagenesis that improves the porosity of the formation.