库车坳陷东部下第三系碎屑岩储层分异成因模式

库车坳陷东部下第三系优质储层主要发育于细粒碎屑岩,而不是粗粒碎屑岩中.从构造沉积作用分析入手,结合该区的古气候特征,通过对两种碎屑岩沉积和成岩演化过程的深入分析,认为粗粒与细粒碎屑岩经历了同沉积、浅埋藏区域地下水、中深埋藏压实、构造破裂与埋藏溶蚀、构造挤压与超压形成等多阶段的叠合改造,不同阶段对碎屑岩储层特征影响不一,从而使得储层储集空间特征出现较大分异.成岩与储层分异的结果形成了现今的油气储层,主要发育于细粒的粉砂岩储层中,据此建立了储层发育演化的成因模式.

Mechanism and Models for the Lower Tertiary Detrital Reservoir Evolution, Eastern Kuqa Depression of the Tarim Basin

The Tertiary high quality reservoir was mainly developed in the fine, but not coarse granular detrital rocks of eastern Kuqa depression of the Tarim basin. The reservoir evolution is reconstructed in this paper, based on a deeper analysis of tectonic, sedimentary and diagenetic process of these two rocks combined with the paleo-climate of this area. A deep analysis of sedimentary and evolution of the fine and coarse granular detrital rocks suggests that the two rocks underwent multi superimposed diagenetic effects, including syn-sedimentary, local ground water in low depth, compaction in intermediate depth, structurally fracture and burial solution, and structurally extrusion. Therefore, the present reservoir features of the two rocks vary largely. The reconstructed model for the reservoir evolution enriches the study of forming mechanism research of detrital clastic rocks.