辽河坳陷变质岩潜山油气藏类型与成藏模式

在剖析辽河坳陷变质岩潜山油气藏的基础上,从油气富集部位和烃源岩与储集层的关系两个方面划分潜山油气藏类型,并探讨其成藏模式.研究表明:根据潜山油气富集部位,潜山油气藏分为潜山顶部油气藏和潜山内幕油气藏;按照烃源岩与储集层的关系,潜山油气藏分为源下型、源边型和源外型3种类型.变质岩潜山油气藏存在源下倒灌型、源边侧供型和源外输导型3种类型成藏模式.源下倒灌型具有直接接触关系、异常高压驱动、油气向下直接倒灌的特点;源边侧供型具有直接接触关系、异常压力和浮力驱动、油气侧向运移直接进入储层的特点;源外输导型具有间接接触关系、浮力为主、油气侧向长距离输导运移的特点.

Types and accumulation modes of metamorphic buried hill reservoirs in Liaohe Depression

On the basis of analysis of the metamorphic buried hill reservoirs in Liaohe Depression,the buried hill reservoirs are classified according to the petroleum enrichment locations and the relationship between source rock and reservoir,and their petroleum accumulation modes are discussed.The results show the buried hill reservoirs can be divided into buried hill top reservoirs and buried hill inner reservoirs from petroleum enrichment locations of the metamorphic buried hill,and they are also divided into three types of reservoirs from the relationship between source rock and reservoir,that is,the source-under type,the source-beside type and the source-outside type.There are three types of metamorphic buried hill petroleum accumulation modes,that is,the source-under flow-backward mode,the source-beside providing mode and the source-outside conducting mode.The source-under flow-backward mode has the characteristics of direct contact relationship between source rock and reservoir,the abnormal high-pressure driving and hydrocarbon migrating downward and directly entering reservoir;the source-beside providing mode has the characteristics of direct contact relationship between source rock and reservoir,the abnormal high-pressure and buoyancy driving and hydrocarbon laterally migrating and directly entering reservoir;the source-outside conducting mode has the characteristics of indirect contact relationship between source rock and reservoir,the buoyancy mainly driving and hydrocarbon laterally migrating in a long distance into reservoir.