论文部分内容阅读
松辽盆地德惠断陷下白垩统营城组地层埋藏深度较大、成岩作用与非均质性强,致密化程度高,勘探风险大。采用普通薄片、铸体薄片、扫描电镜、X线衍射等测试分析方法,分析碎屑岩储层的岩石学特征、物性和成岩作用,根据影响储层物性的主控成岩作用类型和物性特征,结合沉积相(微相)划分成岩相。结果表明:德惠断陷营城组碎屑岩储层主要经历机械压实作用,硅质、碳酸盐(方解石)、黏土矿物和浊沸石胶结作用,以及长石和岩屑溶蚀作用。营城组碎屑岩储层成岩相划分为3种类型:压实致密相、碳酸盐胶结相、不稳定矿物溶蚀相。其中不稳定矿物溶蚀相含气性最好,广泛分布在水下分支河道和水上分支河道微相砂体中,属于建设性成岩相。压实致密相和碳酸盐胶结相导致储层致密,属于不利于储层发育的成岩相。研究结果可为研究区储层分类和评价提供依据。
The Lower Cretaceous Yingcheng Formation in the Dehui fault depression in the Songliao Basin has larger depth of diagenesis, diagenesis and heterogeneity, high degree of densification and high exploration risk. The petrological characteristics, physical properties and diagenesis of clastic reservoirs are analyzed by the test methods of ordinary thin slice, cast thin slice, scanning electron microscope and X-ray diffraction. According to the main controlling diagenesis type and physical property which affect reservoir physical property, Combined with sedimentary facies (microfacies) into lithofacies. The results show that the clastic reservoirs of Yingcheng Formation in Dehui fault depression mainly undergo mechanical compaction, siliceous, carbonate (calcite), cementation of clay minerals and laumontite, and dissolution of feldspar and lithic debris. The diagenetic facies of Yingcheng Formation clastic reservoir are divided into three types: compacted tight facies, carbonate cemented facies and unstable mineral dissolution facies. Among them, the unstable gas is the best in the dissolved phase and widely distributed in the underwater distributary channel and the water channel microfacies, which belongs to the constructive diagenetic facies. Compaction of tight facies and carbonate cementation led to the densification of reservoirs, which are detrimental to reservoir development. The results can provide basis for reservoir classification and evaluation in the study area.