塔里木盆地雅克拉地区卡普沙良群一段储油砂岩体沉积与孔隙发育特征

CHARACTERISTICS OF THE RESERVOIR SAND-BODY SEDIMENTATION AND PORE-EVOLUTION IN THE 1ST. SECTION OF THE KAPUSHALIANG GR, YAKELA AREA OF THE TARIM BASIN

张希明

Zhang Ximing

地矿部西北石油地质局地质大队 乌鲁木齐830011

Geologicul party, Northwest Bureau of Petroleum Geology, MGMR

卡普沙良群一段主要为扇三角洲沉积。储气砂体微相为辫状河冲积平原亚相的河道砂坝微相、水下辫状平原亚相的水下分流河道微相。它们纵向上多期叠置,侧向迁移频繁,呈连续性较好的席状几何形态。孔隙演变过程中成岩作用的破坏作用主要表现为压实、压溶、碳酸盐胶结、交代、石英次生加大等;建设性作用,主要表现为碎裂作用和深部溶蚀;砂岩的储集空间为次生溶孔;渗滤通道是孔隙喉道及与之结合的裂缝;储集类型是孔隙型。

No. 1 Section of the Kapushaliang Group is dominated by the sedimentary sequencesof fan delta, The microfacies of gas reqervoir sand body mainly consists of channel bar andsubaquatic split-flow channel and they should be attributed to braided river plain and sub-aqtiatic braided plain stibfacics,respectively,They are vertically charactcrized by multiplesuperimposition and latterally by frequent migration,in occurrence of well-sequentialsheet-geometry, Du ring the evolution on of porous reservoir,the katogene by diagenesis includes compaction,pressure solution, cementation and replacement of carbonate and quartzsccondary enlargement while the construction consists of remagenesis and deep dissolution.The reservoir spaces of thc sandstones are dominated by secondary solution openingsand percolation paths are pore throats associated with fractures,briiiging about a of thereservoir porous type.

https://doi.org/10.11781/sysydz199404389