源外斜坡区油气成藏主控因素及模式

Main controlling factors and models analysis of oil and gas accumulation in slope area outside oil source area

正确认识油气成藏规律对油气勘探开发意义重大。在研究沉积相、油气藏类型及分布规律、油水分布规律的基础上,通过岩心、测井和地震等资料,对松辽盆地北部朝阳沟油田朝84-6区块扶余油层油气成藏与分布主控因素及成藏模式进行探究。结果表明:研究区油气成藏与分布主控因素有源储压差控制油气藏规模、构造作用控制油气的聚集与分异、沉积相控制油气藏分布三种因素;油气成藏存在断裂侧向输导斜坡高位断块油气聚集成藏、砂体侧向输导断裂遮挡油气聚集成藏、断裂侧向封闭垂向输导岩性圈闭油气聚集成藏三种模式。该项研究可以为类似地区油气成藏主控因素及模式的分析和应用提供参考。

This paper is devoted to a novel study necessitated by the realization that digging deeper into the law behind oil and gas accumulation is of a greater significance to gas exploration and develop- ment. This study probes deeply into the main controlling factors and models of oil and gas accumulation and distribution of Fuyu oil layer in Chaoyanggou oilfield of the northern Songliao Basin Chao 84-6 block and this is based entirely on the study of sedimentary facies, reservoir types, distribution laws and oil and water distribution rules, along with the study of well logs and seismic data. The results show that the oil and gas accumulation and distribution are mainly controlled by three factors：pressure difference between source rock and reservoir controlling reservoir scale; internal agency controlling assembling and differenti- ation of oil and gas; and sedimentary facies controlling reservoir distribution. Oil and gas accumulation are governed by three modes ： fracture of lateral slope transporting high block oil and gas accumulation res- ervoir, oil and gas migrating through sand bodies and sealed by antithetie faults, fracture of lateral lithol- ogle traps closed vertical transporting hydrocarbon accumulation reservoir. The research may serve as a reference for analysis and application of main controlling factors and modes of hydrocarbon accumulation in similar areas.