徐家围子断陷油气运移体系及成藏模式分析

在对含油气组合特征和成藏要素配置关系综合分析基础上，根据断陷盆地发育特征以及天然气藏形成的主控因素，重点分析了地震泵对油气纵向运移的影响，建立了该区油气藏成藏模式，本区发育的油气藏类型主要有构造气藏，岩性气藏和由构造、岩性二者共同控制作用的构造—岩性气藏、地层超覆油气藏以及基岩风化壳油气藏。徐家围子断陷两期构造运动进而形成了正反转构造，为油气提供了良好的构造圈闭及纵向疏导通道。沙河子组共经历了3 次生排烃高峰，第一次由于强烈的构造活动，没有聚集成藏，后两次在其他成藏要素的配合下，最终得以聚集成藏。

Study on Migration System and Accumulation ModelXujiaweizi Depression

Based on the comprehensive analysis of assemblage characteristics and the relationship of the reservoir-formingelements configuration，the accumulation model was formed according to the characteristics of the fault basin and the main controllingfactors of the hydrocarbon reservoir formation，and the influence of seismic pump to the hydrocarbon vertical migrationis also studied. The main kinds of reservoirs here are structural gas reservoirs，lithologic structural gas reservoirs，stratigraphicalon-lap hydrocarbon reservoirs，bedrock weathered crust type oil-gas reservoirs and structural-lithologic gas reservoirs. Theseismic pump extracted the natural gas below the second member of Denglouku Formation up to the top of itself. The positiveinversion structures which were formed by the two-stage tectonic movements provided structural traps and the vertical channelsto divert for the oil and gas. There are three hydrocarbon generation peaks in Shahezi Formation. Because of the intensivestructural activities，the reservoirs were destroyed at the first time；but at the second and third time，with the cooperation ofother elements，the reservoirs were formed.