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通过成岩作用研究与储层综合评价技术,预测辽河西部凹陷南区沙河街组有利储层的平面展布。通过对薄片的鉴定,确定本区砂岩主要类型;利用普通薄片、铸体薄片、扫描电镜、阴极发光等手段研究不同地区、不同层位、不同沉积环境的成岩作用;同时确定主要孔隙类型;以及依据有机质成熟度有关指标等成岩序列和成岩阶段划分标志,进行成岩作用的研究结果表明,划分成岩阶段;通过217口井的薄片资料、沉积相分布和油气分布区图例的分析,确定本区成岩相主要类型;依据岩心测试、测井解释成果,以及孔隙度—深度关系图,发现纵向上储层发育3个主要次生孔隙发育带;通过对储层次生孔隙带形成的主控因素分析得知,通过建立储集物性与沉积相关系、建立成岩作用与储集特征的关系、构造活动与储层发育之间的关系,结合沉积相图、成岩相图、各井储层物性综合评价图,平面上圈定出有利储层、较有利储层发育区。
Through the diagenesis research and reservoir comprehensive evaluation techniques, the plane distribution of favorable reservoirs in Shahejie Formation in the south of Liaohe depression in the western part of China is predicted. Through the identification of thin sections, the main type of sandstones in this area are determined. The diagenesis of different regions, layers and depositional environments are studied by means of ordinary thin slice, cast thin slice, SEM and cathodoluminescence. At the same time, the main pore types are determined. According to diagenetic sequence and diagenetic stage division index of organic matter maturity, the diagenesis study results show that the diagenesis stage is divided. Based on the analysis of thin section data, sedimentary facies distribution and legend of oil and gas distribution in 217 wells, According to the results of core test, well logging interpretation and porosity-depth relationship, it is found that there are three main secondary pore development zones in the reservoir. Through the analysis of the main controlling factors of formation of secondary pore zone It is known that the relationship between diagenesis and reservoir characteristics and the relationship between tectonic activity and reservoir development are established by establishing the relationship between reservoir properties and sedimentary facies. Combined with sedimentary facies maps, diagenetic facies maps and comprehensive evaluation of reservoir physical properties Figure, the circle set on the plane favorable reservoir, more favorable reservoir development zone.