雅克拉气藏白垩系旋回结构法小层划分对比

摘要

Cretaceous condensate gas reservoirs in Yakela condensate gas field are seriously flooded at the middle-late production stages and it is difficult to stabilize the production.To improve the recovery factor and enhance the remaining oil potential of the gas field,in-depth study on the gas reservoirs and detailed stratigraphic correlation are needed to be done.Based on the integrated study of sand body genesis,stratigraphic sequence isochronous correlation and sedimentary facies (microfacies),taking internal structure,cycle superimposition and cycle combination of sedimentary cycles as breakthrough,ultra-micro cycle interfaces are identified,detailed stratigraphic classification and correlation are carried out,the distribution and blocking properties of interlayers are studied and 5 patterns of remaining oil distribution are established to further optimize development layer series through establishing a relationship among core,conventional logging and saturation logging data.The method can solve the problems of diachronism,sandstone to sandstone & shale to shale,and equal thickness split and so on,which is much closer to the actual underground situation and has popularized significance in the development of clastic reservoirs.%雅克拉白垩系凝析气藏开发中后期水淹严重,稳产难度大,为提高采收率,精细挖潜剩余油,需对气藏进行深入研究,精细刻画小层对比格架.把砂体成因、地层层序等时对比及沉积相(微相)研究有机结合在一起,以沉积旋回的内部结构、旋回叠置和组合关系为突破口,通过建立岩心、常规测井以及饱和度测井资料之间的岩电关系,识别超微旋回界面,开展精细小层划分对比,进而研究隔夹层展布及封挡性等,并建立了5种剩余油分布模式,进一步优化开发层系.该方法较好地解决了“穿时性”、“砂对砂泥对泥”、“等厚劈分”等问题,更逼近地下真实情况,在碎屑岩油气藏开发中具有较大推广意义.