塔河油田主体区奥陶系缝洞系统与油气分布

通过宏观构造演化与微观流体地球化学性质的研究,认为塔河油田油气分布受控于海西早、晚期构造运动叠加形成的构造格架。古构造叠加的结果控制了古地貌和裂缝发育强度,古地貌和裂缝发育强度控制了古水系的流动方向及溶蚀深度,它们是岩溶作用发育的主控因素。特别是海西晚期形成的古构造与阿克库勒凸起轴部的叠合部位,是岩溶、裂缝最发育的地区,普遍存在的高角度裂缝在三维空间上将各类岩溶孔洞连通为大规模储集体,从而造成主油区大型缝洞系统横向上的分区性。通过对塔河油田奥陶系主体区油藏流体非均质性及宏观构造演化的分析,划分出2个大型缝洞系统和1个中小型缝洞系统。 

FRACTURE-CAVE SYSTEM AND PETROLEUM DISTRIBUTION IN ORDOVICIAN IN MAIN REGION OF TAHE OIL FIELD

Macroscopic tectonic evolution and microscopic fluid geochemistry studies have proved that,petroleum distribution in the Tahe Oil Field is controlled by tectonic framework formed by combination of early and late Hercynian movements.Superposition of ancient structures controls generation of palaeo-geomorphology and fracture.Generation of palaeo-geomorphology and fracture controls ancestral rive orientation and erosion depth.They are the main controlling factors of karst effect.Especially in the superposition of ancient structure formed during late Hercynian and axle of the Akekule Uplift,karst and fracture generate in large scale.Commonly-found large angle fractures connect caves into large reserve,resulting in horizontal division of large fracture-cave system in main region of the field.Based on fluid heterogeneity and macroscopic tectonic evolution analysis in Ordovician in main region of the Tahe Oil Field,2 large and 1 middle-small fracture-cave systems are divided.