东辛复杂断块油气田成藏特征

POOLFORMING CHARACTERS OF COMPLEX FAULTBLOCK OIL AND GAS FIELDS IN DONGXIN

我国最大的复杂断块油气田东辛油气田的油气源充足、储集层发育、继承性发育的隆起带构造背景十分有利于油气的聚集。断裂多期活动致使油气纵向运移活跃，油气沿断裂运移、聚集。断层强烈活动期，流体沿断裂向上快速注入式运移；断裂相对不活动期，断层逐渐封闭，进入浅部地层的油气沿断层形成次生油气藏，从而形成纵向上多层组含油气，原油忽轻忽重，油气藏沿断层呈叠瓦式展布。

Abstract China's largest complex faultblock oil and gas fields-Dongxin oil and gas fields possess sufficient oil and gas sources and well developed reservoir rocks.The inherited uplift helts developed there are favourable for hydrocarbon accumulation.Multistage faultings resulted in active vertical migration of oil and gas.During bady faulting,hydrocarbons were injected upward along the faults;during stable stage,faults closed gradually,and hydrocarbon that entered shallow strata migrated along the faults to form secondary oil and gas pools,thus forming vertical multilayer hydrocarbon assemblayes.The pools imbricated and formed oil pool→oilgas pool→gas pool sequences in ascending order.