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对四川盆地磨溪气田嘉陵江组嘉二段二亚段C层(T1j22C)砂屑云岩宏观与微观特征进行深入分析,建立滩相碳酸盐岩优质储集层的成因模式。原生粒间孔是滩相碳酸盐岩储集层的主要储集空间,其主要特征及判识标志包括:储集层发育严格受沉积微相控制、孔隙以残余粒间孔和溶扩残余粒间孔为主、颗粒接触处仅有海底胶结物发育、初期压实使颗粒呈线-凹凸接触的格架支撑及部分孤立粒间孔隙的埋藏胶结物不具溶蚀现象等。原生粒间孔的保存机制为:在海底胶结后,初期压实使具早期环边胶结物的颗粒呈格架支撑、喉道减小;压实流体胶结使滩体周缘致密化,并且粒间孔内有限的浅埋藏胶结物使喉道堵塞,成岩流体达到溶蚀-胶结平衡后胶结作用终止;后期埋藏溶蚀主要调整、优化改造先期孔隙层,其对单个储渗体储集空间的绝对增加值仅占次要地位,并不改变这类储集层的储渗体时空分布。
The macro and micro characteristics of dolomitite C layer (T1j22C) sandstone in Jialing Section of Jialingjiang Formation in Moxi River Formation in Moxi gas field in Sichuan Basin are deeply analyzed to establish the genetic model of high-quality reservoirs of beach facies carbonate rocks. The primary intergranular pores are the main reservoir space for the beach facies carbonate reservoirs. The main characteristics and identification signs of the reservoirs are: the development of the reservoir is strictly controlled by the sedimentary microfacies, and the porosity is between the residual intergranular pores and the dissolved residual remnants Hole-based, granular contact only seabed cements development, the initial compaction of the particles were line - bump contact with the grid support and part of the isolated intergranular pores of the buried cement without erosion and so on. The mechanism of the preservation of primary intergranular pores is as follows: after the seafloor cementation, the initial compaction causes the grains of the early rim cement to be lattice-supported and the throat decreases; the compaction fluid cementing densifies the periphery of the beach body, The limited shallow burial cement in the bore blocks the throat, and the diagenetic fluid reaches the dissolution-cementation equilibrium cementation. The later burial dissolution is mainly adjusted and the advanced pore layer is optimized and optimized. The absolute added value of reservoir space for single reservoir Only occupy a secondary position, does not change the reservoir space-time distribution of such reservoirs.