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塔中-巴楚地区志留系柯坪塔格组是塔里木盆地重要的勘探目的层之一。在对该区柯坪塔格组沉积背景认识的基础上,通过铸体薄片、扫描电镜、电子探针及X射线衍射等分析方法对储层成岩作用进行了系统的研究,认为研究区砂岩主要经历了压实-压溶作用、胶结作用、溶解作用,目前已达到了晚成岩A期的末期。塔中地区与巴楚地区柯坪塔格组成岩作用的差异主要是原始沉积环境导致的物质成分差异所致,并最终导致了物性的差异。依据成岩作用对物性的影响,划分出4种成岩相,其中早期碳酸盐胶结物强溶解与晚期弱-中等充填成岩相为最有利储集相带,强石英次生加大成岩相、碳酸盐强烈胶结成岩相和强烈压实成岩相不利于孔隙的发育。
The Tarim-Bachu Silurian Kepingtage Formation is one of the most important exploration targets in the Tarim Basin. Based on the understanding of the sedimentary background of the Kepingtage Group in this area, the diagenesis of the reservoir was systematically studied by means of thin films, scanning electron microscopy, electron probe and X-ray diffraction. It is concluded that the main sandstone in the study area Experienced the compaction - depressurization, cementation, dissolution, has reached the end of late diagenetic A period. The differences between Kepingtage compositional rocks in the Tazhong area and Bachu area are mainly caused by the difference of material composition caused by the original depositional environment and eventually lead to the differences in physical properties. According to the influence of diagenesis on physical properties, four diagenetic facies are divided into four types: diagenetic facies and carboniferous diagenetic facies are the most favorable reservoir facies, and strong dissolution of early carbonate cementation and late weak- The strong cementation of acid salts into facies and the strong compaction of diagenetic facies are detrimental to pore development.