二连盆地地层岩性油藏“多元控砂—四元成藏—主元富集”与勘探实践(Ⅱ)——“四元成藏”机理

"Multi-factor controlling,four-factor entrapping and key-factor enrichment"of stratigraphic-lithologic reservoirs and exploration practice in Erlian Basin(Ⅱ)——"Four-factor entrapping"mechanism

在二连盆地不同凹陷地层岩性油藏成藏条件分析的基础上,认为地层岩性圈闭能否成藏,主要受4个因素的控制。在圈闭与油源具备的前提下,良好的油气运移通道是地层岩性油藏形成的基础;流体动力学特征决定了地层岩性油藏的分布区域;储层临界物性是油气充注的决定性因素;砂体的封闭性能则是地层岩性圈闭成藏的关键。上述4个因素良好配置,有利于地层岩性油藏的成藏。

Based on the analysis of the hydrocarbon accumulation conditions for stratigraphic-lithologic reservoirs in different sags in Erlian Basin,the accumulation of the stratigraphic-lithologic traps is considered to be controlled by four factors.On the premise of traps and oil sources,favorable migration pathway is the background for the forming of the reservoirs;the features of fluid dynamics are closely related to the distribution of the reservoirs;the reservoir critical property is the deciding factor for the hydrocarbon injection;the sand body sealing is the key factor for the accumulation.