油气运移动力及输导体系对海塔盆地油气分布的控制作用

海塔盆地属于陆相断陷盆地,受断裂控制,生烃面积小,油气运移范围局限,运移距离和方向受到运移动力和输导体系的影响.二次运移的动力包括浮力和构造活动力,其主要影响因素是地层倾角和断裂活动强度.输导体系包括砂体、断层、不整合及其空间组合.通过解剖海塔盆地典型油气藏,分析了源岩生排烃特征、储层沉积相、物性条件以及断层分布特征,...

Influence of migration power and channel on oil and gas distribution in Haita Basin

Haita Basin is one of the continental rift basin which controlled by fault with limited source rock.Migration direction and distance of oil and gas are influenced by migration power and conducting.The second migration power include buoyancy and tectonic activity，which controlled by stratum dip and faulting.Migration conducting includes sand，fault and unconformity and their combination.According to the dissection of typical reserve in Haita Basin，the character of hydrocarbon generation and expulsion from source rock，the facies and porosity and permeability of reservoir，and the distribution of fault were discussed.The result show that oil and gas migration from sand first，and then from fault when tectonic movement happened.The migration distance is long in the area with strong migration power，the differentiation of oil and water is clear，and the interface of oil and water is clear too.The influence of sand is weak where the migration power is strong.And the migration distance is short where the migration power is weak，the differentiation of oil and water is poor，oil and water exist in the same layer，and porosity of reservoir influence oil distribution strongly.