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莫索湾地区清水河组油气资源丰富,但埋深较大,储层非均质性较强,优质储层分布规律较复杂。本次研究以岩心、镜下薄片、压汞、物性及地层测试资料为基础,结合储集砂体沉积条件,深入分析储层特征及优质储层发育的控制因素,结果表明,储层整体储集条件较为优越,孔隙类型以原生孔隙为主,且孔隙结构多为中孔粗喉型;储层平均孔隙度为15.26%,平均渗透率为35.99×10~(-3)μm~2,属中孔中渗型。其中优质储层发育主要受控于沉积微相、成岩作用和异常高压3方面。沉积微相控制砂体的宏观分布、成分成熟度和结构成熟度,决定储层原始物性的好坏。沟槽带的水下分流河道砂体和低凸带的滩坝砂体物性最优越。成岩作用决定着对储层物性的后期改造及次生孔隙的发育程度。普遍存在的地层超压对于深部储层物性的保存具关键作用。
The Qingshuihe Formation in the Mosuo Bay area is rich in oil and gas resources, but with larger depths, stronger reservoir heterogeneity and more complicated distribution of high-quality reservoirs. Based on the test data of core, microscopic mercury, physical properties and formation test, this study combined with the sedimentary conditions of reservoir sandstone, deeply analyzed the characteristics of reservoir and the controlling factors of high-quality reservoir development. The results show that the whole reservoir The set of conditions is more favorable. The pore types are dominated by primary pores, and the pore structure is mostly mesopore and throat type. The average porosity of the reservoir is 15.26% and the average permeability is 35.99 × 10 -3 m -2. Mesophasic infiltration. Among them, the development of high-quality reservoirs is mainly controlled by sedimentary microfacies, diagenesis and abnormal high pressure. Sedimentary microfacies control the macroscopic distribution of sand body, composition maturity and structure maturity, determine the quality of the original reservoir properties. The underwater distributary channel sand bodies and low-belted beach-bar sand bodies in the gully belt have the best physical properties. Diagenesis determines the post-transformation of reservoir physical properties and secondary porosity development. Ubiquitous formation overpressure plays a key role in preserving the physical properties of deep reservoirs.