Based on comprehensive analyses of occurrence, petrological observation, pore structure and geochemistry, the different reservoir characteristics and reservoir evolutionary pathways between different oolitic shoal reservoir types of the Feixianguan Formation on the west side of the Kaijiang-Liangping Trough have been studied. There exist three stages of high-energy slope break belts in the Feixianguan period, the corresponding three stages of oolitic shoals gradually migrating in the direction of the trough. Three types of oolitic shoal reservoirs, namely, residual-oolitic dolomite, mold-oolitic dolomite and sparry oolitic limestone, were formed during sedimentary-diagenetic evolution, the pore types being intergranular dissolved pore, mold pore (or intragranular dissolved pore) and residual intergranular pore, respectively. The petrology, physical properties and pore structure of the different types of oolitic shoal reservoirs are quite different. Residual-oolitic dolomite reservoirs have the best quality, while sparry oolitic limestone reservoirs have the poorest. Combined with analyses of trace elements, rare earth elements and carbon-oxygen isotopes, it is suggested that the formation of residual-oolitic dolomite reservoirs is jointly controlled by penesaline seawater seepage-reflux dolomitization and hydrothermal dolomitization. Mold-pore oolitic dolomite reservoirs are controlled by penesaline seawater seepage-reflux dolomitization and meteoric water solution. The burial dissolution of organic acid not only further improves the reservoir qualities of previously formed oolitic dolomite reservoirs, but also preserves residual intergranular pores in the sparry oolitic limestone reservoirs.

中文翻译：

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四川盆地东北部龙岗地区三叠系飞仙关组主要控制因素及不同鲕滩储层特征

在对赋存、岩石学观察、孔隙结构和地球化学等综合分析的基础上，研究了开江-梁平海槽西侧飞仙关组不同鲕滩储集层类型之间的不同储层特征和储层演化路径。飞仙关期存在三期高能坡折带，相应的三期鲕粒滩逐渐向海槽方向运移。沉积-成岩演化过程中形成了残余鲕粒白云岩、模壳鲕粒白云岩和闪长鲕粒灰岩三种鲕粒滩储集层，孔隙类型为粒间溶孔、模孔（或粒内溶孔）和残余粒间溶孔。毛孔，分别。岩石学，不同类型鲕滩储集层物性和孔隙结构差异较大。残余鲕粒白云岩储层质量最好，而鲕状灰岩储层质量最差。结合微量元素、稀土元素和碳-氧同位素分析，认为残余鲕粒白云岩储层的形成受准海相海水渗流-回流白云石化作用和热液白云石化作用共同控制。模孔鲕粒白云岩储层受准海盐海水渗流-回流白云石化和大气水溶液控制。有机酸的埋藏溶蚀不仅进一步改善了先前形成的鲕粒白云岩储层的储层质量，