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通过薄片观察、扫描电镜、X光衍射、物性压汞实验等方法,结合对储层岩石学特征、成岩作用特征,孔隙结构等的系统研究。砂岩以岩屑质长石砂岩、长石质岩屑砂岩为主,具有成分成熟度较低、结构成熟度中等的特征。研究区长8储层主要处于中成岩A晚期一中成岩B早期,并可以将其分为建设性和破坏性两种成岩作用,其中有利的成岩相包括绿泥石薄膜剩余孔隙相、长石溶蚀相、高岭石胶结相和裂缝孔隙相,而不利的两种成岩相分别是碳酸盐胶结相和强压实相。孔隙演化定量研究表明,压实作用和胶结作用使大量的原生孔隙损失,溶蚀作用产生的次生孔隙,又使孔隙又有所改善。长8储层发育多种类型孔隙、喉道及孔隙组合类型,总体看,长81的储集性能较长82的好。
By means of the observation of thin slices, scanning electron microscopy, X-ray diffraction and physical mercury intrusion experiments, a systematic study on the petrological characteristics, diagenesis characteristics and pore structure of reservoirs is carried out. Sandstone is mainly composed of lithic feldspathic feldspar sandstone and feldspathic lithic sandstone, which have the characteristics of low maturity and medium maturity. The reservoir of reservoir Chang 8 is mainly located in the early stage of diagenesis A of middle diagenesis A and can be divided into two types of constructive and destructive diagenesis, in which the favorable diagenetic facies include residual pore facies of chlorite film, Dissolution phase, kaolinite cementation phase and fractured pore facies, whereas the unfavorable two diagenetic facies are carbonate cementation and plutonic phase, respectively. The quantitative study of pore evolution shows that the compaction and cementation make a large number of primary porosity loss, secondary porosity caused by erosion, and the porosity is improved again. There are many types of pores, throats and pore combinations in Chang 8 reservoir. Generally speaking, reservoir 81 has a longer reservoir capacity of 82.