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通过沉积相分析、岩心观察、薄片鉴定和岩心物性统计分析等表明,民丰洼陷储层岩石类型以岩屑长石砂岩和长石砂岩为主,孔隙类型以粒间溶孔为主,物性总体上为高孔、中高渗透。原始沉积环境是储层物性的主要决定因素,受岩石类型、成熟度、分选性和填隙物含量等的影响,物性优劣顺序为三角洲前缘分流河口砂坝、水下分流河道、近岸水下扇内扇、远砂坝和近岸水下扇外扇。成岩作用对储层物性的影响主要表现为早期压实压溶作用及后期强烈的钙质胶结作用,是导致储层物性损害的主要原因。原始物性好的位置在经历压实和早期胶结之后往往有利于储集空间的残余,从而在溶解作用下更有利于流体的运移以及长石和岩屑等颗粒的溶解,并由此有效地提高了孔隙度并改善了喉道连通性。
Sedimentary facies analysis, core observation, thin section identification and core physical statistic analysis show that the rock types of Minfeng sag are mainly feldspar feldspathic sandstone and feldspar sandstone, and the pore types are dominated by intergranular dissolved pores. Physical properties Overall high-porosity, high permeability. The original sedimentary environment is the main determinant of reservoir physical properties. Depending on the rock type, maturity, sorting and interstitial content, the order of the physical properties is delta front distributary mouth bar, underwater distributary channel, Shore fan underwater fan, far sand dam and nearshore underwater fan. The effect of diagenesis on reservoir physical properties is mainly caused by the early compaction and pressure dissolution and the strong calcareous cementation in the later stage, which is the main reason that causes reservoir physical damage. Good locations of good physical properties tend to favor remnants of reservoir space after undergoing compaction and early cementation, thereby facilitating migration of fluids and dissolution of feldspars and debris such as feldspars and thereby effectively increasing Porosity and improved throat connectivity.