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靖边气田主产层次生溶蚀孔洞缝成层连片发育,孔洞缝分布受沉积相和成岩作用双重控制。本文结合98口井岩心观察、1000余块薄片鉴定及多种化验测试资料对储层沉积相、成岩作用进行了系统研究,探讨了储层沉积-成岩演化模式及其对孔洞缝储层发育的控制作用。结果表明,靖边气田储层为蒸发潮坪沉积,并可细分为潮上带泥云坪、膏岩洼地、含膏云坪;潮间带含藻云坪、泥云坪、颗粒滩、潮下带灰坪7种沉积微相;储层埋藏主要经历了白云化、溶解、充填、破裂、交代、压实-压溶、角砾化和重结晶8种成岩作用;储层沉积-成岩演化总体分为沉积同生期、近地表浅埋藏期、抬升风化期和后埋藏期4个阶段;马五11～马五31、马五41a高孔渗段的形成主要受沉积同生期和抬升风化期溶解作用及含膏云坪、含藻云坪和颗粒滩微相控制,而马五32～马五33、马五41b～马五43b、马五5低孔渗段的形成主要受泥云坪、膏岩洼地和灰坪微相控制。
The Jingbian gas field has mainly developed layers of dissolution karst pores and contiguous strata, which are controlled by both sedimentary facies and diagenesis. In this paper, the sedimentary facies and diagenesis of the sedimentary facies and diagenesis of 98 wells were systematically studied based on the observation of more than 1000 cores and more than 1000 thin sections and various laboratory test data. The sedimentary-diagenetic evolution of reservoirs and their effect on the development of reservoir Control effect. The results show that the reservoirs in the Jingbian gas field are evaporized tidal flat sediments and can be subdivided into muddy troughs, gypsum depressions and gypsum clouds in the tidal zone. The intertidal zone contains algal Yunping, muddy ping, There are 7 sedimentary microfacies in the subtidal zone and gray earth. The buried reservoirs mainly experienced dolomitization, dissolution, filling, rupture, replacement, compaction-pressure dissolution, brecciation and recrystallization. Diagenesis: The evolution is generally divided into four stages of sedimentary synsegene, near-surface shallow burial, upwelling weathering and post-burial; the formation of high porosity and permeability of Ma511 ~ Ma531 and Ma541a is mainly affected by the sedimentary period Uplifting weathering dissolution and the control of micro-facies including Gaoyunping, algal Yunping and granulite, and the formation of low porosity seepage in Ma Wu 32 ~ Ma Wu 33, Ma Wu 41b ~ Ma Wu 43b and Ma Wu 5 Mud Yunping, gypsum depression and gray Ping micro-phase control.