摘要:
基于成岩作用的影响因素及库车盆地的实际,深入研究了克拉2气田次生孔隙发育段储层岩石成分特征及早期古气候条件下胶结物对于成岩作用及次生孔隙的影响,分析了地层压力系统中超高压带、构造裂缝、自生矿物分带的成因、作用、特点及其与储层物性、成岩环境的相关关系,评价了储层中长石、方解石的溶解,白云石对方解石的交代,压实、胶结等主要成岩作用类型对次生孔隙的具体影响和贡献,认为该区早期碱性成岩环境下方解石胶结物的溶解是形成该区次生孔隙发育带的主导因素,并根据该区自生矿物流体包裹体及埋藏史特征,建立了该区成岩作用及孔隙演化的模式。
Abstract:
Based on the influencing factors of diagenesis and the reality in Kuqua dep ression, in this paper, the research on the origin of the secondary porosity has been performed for the deep-buried high quality reservoir. The mineral and rock fragment components of the sandstone carbonate cement formed under the past climate and their effects on the secondary porosity have been described. The overp ressure, crevice, authigenic mineral assemblage and their origins, characters, effects on the diagenetic environment and secondary porosity have measured to evaluate the feld-spar and calcite dissolution condition, the rep lacement of dolomite to calcite, the effects of compaction and cementation of the sandstone and so on. Lots of information suggests that the dissolution of calcite cement be responsible for the porosity abnormity at deep depth. Furthermore, on the basis of the study of fluid inclusion and all the worksmentioned above, we established the model of diagenesis and porosity evolution in this area.
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