济阳坳陷石炭系—二叠系储层成岩作用及孔隙演化

石炭纪—二叠纪海陆交互沉积背景下发育的碎屑岩是济阳坳陷主要的储集岩。薄片、扫描电镜等多种微观分析研究表明,储层成岩作用主要有压实作用、胶结作用、交代作用、溶蚀作用及裂缝形成作用等。依据残留地层叠置样式及埋藏史,结合古地温、有机质热演化参数、黏土矿物转化序列、自生矿物以及成岩事件等多方面研究成果,将储层划分为古最大埋深等于现今埋深、古最大埋深大于现今埋深两种成岩阶段类型,前者处于中成岩B阶段和晚成岩阶段,后者处于中成岩A阶段和B阶段。多期复杂的构造运动导致储层具有多变的成岩环境及复杂的成岩演化序列,并控制了储层的成岩演化史、孔隙演化史及储集性能。

Diagenesis And Porosity Evolution Of Carboniferous-Permian Reservoirs in Jiyang Depression

Clastic rock is the main type of reservoir rock developed in netritic sedimentary environment in Permo- Carboniferous of Jiyang Depression. Analysis of thin section and scanning electron microscopy indicate that the main diagenesis includes compaction, cementation, alteration, dissolution and fracturing,etc. On the basis of styles of superimposed residual formation and burial history,combined with palaeo-geotemperature,factors of organic ther- mal evolution,transformation serial of clay minerals and authigenic minerals,these reservoirs can be classified as two types,the one is the palaeo-burial depth that is equal to present burial depth and the another is the palaeo-burial depth that is deeper than present. The former one is during the middle and late diagenetic stages, the later is dur- ing the middle diagenetic A and B stages. The reservoirs have the characteristic of complex diagenetic evolution se- quences and diverse diagenetic environments caused by multiphase tectonic activities,which controls the diagenetic evolution history, the porosity evolution history and the capability of the reservoirs.