基于露头地质调查、岩心和薄片观察、储层地球化学分析及溶蚀模拟实验的结果,剖析了四川盆地寒武系龙王庙组岩相古地理及白云岩储层特征、成因和分布规律.指出四川盆地龙王庙组为远端变陡的碳酸盐缓坡沉积,纵向上可划分为上、下2段,从下而上记录了气候从潮湿到干旱的变化序列;颗粒滩主要分布于龙王庙组上段的浅水内缓坡,是龙王庙组白云岩储层发育的基础;准同生溶蚀作用受暴露面控制,是龙王庙组颗粒滩储层孔隙发育的关键;埋藏期溶蚀孔洞主要沿准同生期形成的孔隙带继承性发育,对龙王庙组储集空间具有重要贡献;盐亭—安岳—威远一带滩体多期叠置,处于古地貌高部位且埋藏溶蚀发育,是勘探有利区,全盆地广泛分布的颗粒滩均为潜在的勘探对象.

Based on the results of outcrop geological survey, core and slice observation, geochemical analysis, and reservoir simulation experiment, the lithofacies paleogeography, and the characteristics, origin, distribution of dolomite reservoir of the Cambrian Longwangmiao Formation in Sichuan Basin are analyzed. As a result, five conclusions are drawn: (1) The Cambrian Longwangmiao Formation could be divided into upper and lower sections in the Sichuan Basin, recording the climate change from humid to arid. In addition, the carbonate distally steepened ramp sedimentary models were established. (2) The granular shoals, the developing basis of the dolomite reservoir, are mainly distributed in the shallow ramp of the upper section of the Longwangmiao Formation. (3) Moreover, the contemporaneous dissolution, controlled by the exposure surface, is a critical factor for the development of granular shoal reservoir in the Longwangmiao Formation. (4) The dissolution vugs are not only extensively distributed, but also successively developed along the contemporaneous pore zones. (5) The granular shoals are superimposed in many stages in Yanting-Anyue-Weiyuan area, which are located in the high part of paleogeomorphology and developed buried dissolution, so it is a favorable area for exploration. Moreover, the granular shoals widely distributed in the whole basin are the potential exploration targets.