辽海滩海中部海月潜山油气成藏条件分析

Analysis of hydrocarbon accumulation conditions of Haiyue buried hill in the middle of Liaohe beach-shallow sea

为研究海月潜山的油气成藏条件,探讨油气成藏的主控因素与油气聚集规律,从潜山的油源条件、储层条件、油气运移通道和油藏保存条件等诸多要素入手,开展深入分析。研究结果表明:海月潜山东西两侧分别为两大主力生油洼陷,长期持续活动的深大断裂和潜山不整合面构成良好的油源通道,多期次发育的裂缝为油气聚集成藏提供了有利的储集空间,沙河街期和东营期稳定分布的湖相泥岩披覆潜山之上,为潜山成藏提供了良好的保存条件。其中,位于西侧深大断裂附近,侧向直接与生油岩对接和位于构造转向部位的低潜山是油气成藏的最有利场所。

In order to study the hydrocarbon accumulation conditions,and major control factors and pattern of Haiyue buried hill,the oil source conditions,reservoir conditions,hydrocarbon migration pathways and reservoir preservation conditions and other factors of the buried hill are analyzed in this paper. The study results indicate that there is a major oil source depression on each side of Haiyue buried hill;the long-lasting activity of deep faults and unconformity of the buried hill constitute favorable pathways for oil sources;the fractures that have developed over multiple phases provide favorable reservoir space for hydrocarbon accumulation and the lacustrine mudstone stably distributed during Es2 and Dongying period overlying the buried hill provides favorable preservation conditions for the buried hill accumulation.Near the deep fault on the western side,the low lying buried hill directly jointing the oil source rock laterally and at the turning point of the structure is the most favorable place for hydrocarbon accumulation.