四川盆地中西部上三叠统须家河组成岩相划分及展布

DIVISION AND DISTRIBUTION OF DIAGENETIC FACIES IN UPPER TRIASSIC XUJIAHE FORMATION, CENTRAL-WEST SICHUAN BASIN

根据控制沉积物孔隙形成与演化的主要成岩作用,将四川盆地中西部须家河组储层划分为6种成岩相,即浅埋藏强压实相、浅—中埋藏钙质胶结相、中埋藏绿泥石胶结相、中—深埋藏硅质胶结相、深埋藏溶蚀相和近地表高岭石胶结相。各种成岩相的形成和分布与沉积物的原始组分密切相关。各成岩相之间储层物性差别大,不同的成岩组合可形成成岩圈闭。

Xujiahe reservoirs can be divided into six diagenetic facies according to some diagenesis which controls the formation and evolution of sediments pore, such as the shallow-burial strong-compacted facies, the shallow to middle-burial calcareous cementing facies, the middle-burial chlorite cementing facies, the middle to deep-burial siliceous cementing facies, the deep-burial dissolution facies and the near-subface kaolinite cementing facies. The formation and distribution of these diagenetic facies are closely related to sediments original component. Different diagenetic facies has different reservoir characteristics, furthermore, different diagenetic assemblages can form diagenetic traps.