基于野外露头、钻井岩心、测井及薄片等宏观及微观资料,对四川盆地茅口组的沉积相展布特征,储层类型、主控因素及分布规律展开了系统研究并取得以下认识:①茅口组沉积已不再受加里东期古隆起控制,沉积格局更多是受到峨眉地裂运动造成的北西-南东向断层的影响;②茅口组主要发育碳酸盐缓坡、斜坡及盆地3个主要相带,其中茅口组中晚期高位域发育的浅水缓坡高能滩是最有利的储集相带;③茅口组主要发育孔洞-孔隙型白云岩和岩溶缝洞型石灰岩2类储层,高能生物碎屑颗粒滩是茅口组2类储层形成的物质基础,早期白云石化作用是白云岩储层得以保存的关键因素,而构造运动及古岩溶作用是石灰岩储层发育的重要条件;④白云岩储层主要分布在雅安—乐山以及盐亭—广安地区,岩溶缝洞型石灰岩储层在全盆地均可见,但在泸州—开江古隆起范围内最为发育.

Based on data of outcrop, drilling core, logging, thin section and other macro and micro data, the characteristics of sedimentary facies, reservoir types, reservoir-controlling factors and reservoir distribution patterns of the Perimian Maokou Formation are systematically studied in Sichuan Basin. The author obtains the understanding as follows: (1) The sedimentary pattern of Maokou Formation is influenced by the NW-SE faults formed by Emei taphrogenesis, but not by Caledonian paleo-uplift. (2) Carbonate ramp, slope and basin are three main facies in Maokou Formation. The high-energy shoal of high-stand system tract developed in shallow ramp in the middle-late period of Maokou is the most favorable reservoir sedimentary facies. (3) Two types of reservoir such as hole-pore dolomite reservoir and karst fractured-vuggy limestone reservoir are developed in Maokou Formation. The high-energy bioclastic shoal is the material basis for reservoirs of Maokou Formation. Early dolomization is the key factor for the preserving of dolomite reservoir, tectonic movement and paleo-karstification are important conditions of reservoir development. (4) Dolomite reservoir is mainly distributed in the Ya'an-Leshan and the Yanting-Guang'an areas. Karst fractured-vuggy limestone reservoirs are distributed in the whole basin, but the Luzhou-Kaijiang uplift is the most developed area.