以四川盆地普光气田下三叠统飞仙关组砾屑碳酸盐岩为研究对象,根据砾屑成分、发育规模、颗粒大小、磨圆程度等方面的差异,将砾屑碳酸盐岩分为砾屑灰岩和砾屑白云岩.研究结果表明,普光地区飞仙关组小型砾屑灰岩多为异地搬运后沉积形成的,它的形成与浊流有关;而大型砾屑白云岩多为未经过搬运(或经短距离搬运)、岩崩塌积后沉积形成的.普光气田飞仙关组斜坡带砾屑碳酸盐岩沉积模式中,碳酸盐台地为砾屑灰岩提供物质来源;上斜坡一般发育大型砾屑白云岩,是储层发育的有利地带;下斜坡处发育薄层砾屑灰岩,储层发育条件差.

By the observation of the drilling core, it is found that a new type of reservoir, named gravel-sized grain carbonate rocks, is mainly distributed in the Feixianguan Formation of Puguang Gas Field in the foreslope of platform. Based on the analysis of gravel composition, development scale, grain size and degree of roundness, it could be divided into calcirudyte and dolorudite. It is shown that small scale calcirudyte is mainly formed by long distance transportation and with relationship to the turbidity current; and large scale dolorudite is mainly formed by no moving or by short distance transportation and with relationship to the collapsing sediment. In the sedimentary model of gravel-sized grain carbonates in slope belt in Feixianguan Formation of Puguang Gas Field, the source of calcirudyte is from the carbonate platform, and the big scale dolorudite is usually distributed in the upper slope belt where the favorable reservoir is well developed, but the thin calcirudyte is distributed in the lower slope where the reservoir is not developed.