摘要
陇东地区白马区长8储层是在湖盆扩张过程中形成的三角洲前缘水下分流河道沉积,合水区长6储层主要发育三角洲前缘浊积体,为低孔特低渗储层。二者同属西南物源沉积体系的两套储层,由于不同的水动力条件、搬运距离、沉积地形、沉积水深等环境及中等压实强度的影响,形成了该区特低渗储层。储层粒度细、绿泥石不发育和碳酸盐胶结物含量高是导致合水长63比白马区长81储层物性更差的主控因素。
The Chang 8 reservoir at Baima in the Longdong area consists of delta-front underwater distributary channel deposits formed in the process of lake basin expansion, while the Heshui Chang 6 reservoir was mainly delta-front turbidity sand. They are low- and very low-permeability reservoirs respectively, both belonging to the southwest provenance sedimentary system of the Ordos basin, and the very low-permeability reservoir formed in the area due to different hydrodynamic conditions, transport distances, depositional topographic conditions and depositional water depths, as well as the influence of the moderate compaction strength. The fine grain size, lacking of chlorite and high contents of carbonate cements are the main controlling factors that make the physical properties of the Heshui Chang 63 reservoir poorer than those of the Baima Chang 81 reservoir.
出处
《地质力学学报》
CSCD
2006年第4期454-461,共8页
Journal of Geomechanics
关键词
甘肃陇东地区
延长组
沉积差异
低渗响应
Longdong area
Yanchang Formation
sedimentary difference
low-permeability response
