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惠民凹陷商７４１块火成岩分布于沙一段、沙三段地层中，并且沙三段中期火成岩与沙一段火成岩非同期形成，沙三段中期火成岩形成于沙三段沉积晚期。岩性主要为辉绿岩、玄武岩和火山碎屑岩。商７４１火成岩油藏储集空间类型多样，主要有原生的残余气孔、角砾间孔和次生溶孔、构造裂缝和收缩裂缝等，其中沙一段爆发相的火山角砾岩以原生的残余气孔、角砾间孔为主；沙三段侵入相产出的辉绿岩和玄武岩以构造裂缝、收缩裂缝为主。火山通道附近是原生孔隙、构造裂缝和收缩裂缝发育带，是有利勘探领域。
The 741 igneous rocks of the Huimin Depression are distributed in the Es3 and Es3 strata, and the mid-term igneous rocks in the third member of the Shahejie Formation and the first member of the Shahejie Formation are formed non-contemporaneously. The mid-term igneous rocks in the third member of the Shahejie formation were formed in the sedimentary stage of the third member of the Shahejie formation. Lithology is mainly diabase, basalt and pyroclastic rocks. Shang 741 igneous reservoirs have various types of reservoir space, including primary residual stomata, intergranular pores and secondary dissolution pores, structural fractures and shrinkage fractures. The volcanic breccia in the first Member of the Shahejie Formation, with primary residual pores , Interbedded interbedded breccias. The diabase and basalts derived from the intrusive facies of the third member of Shahejie Formation mainly dominated the structural cracks and shrinkage cracks. Near the volcanic channel is the primary porosity, structural cracks and shrinkage fracture zone, is conducive to exploration.