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在分析准中地区侏罗系层间断层变形及其分布特征基础上,探讨了此类断层与油气成藏的关系。侏罗系层间正断层主要形成于西山窑组沉积期前,由于受西山窑组沉积末期和侏罗纪末的燕山Ⅰ幕和燕山Ⅱ幕构造运动影响,先存部分层间断裂反转为逆断层,现今剖面上呈现正断层和逆断层并存。研究区侏罗系构造层的层间断层普遍发育,但对于不同层位,不同区块,其发育规模和程度有所差异。侏罗系层间断层、局部不整合面和骨架砂体构成了浅层油气输导体系,为油气聚集提供运移通道和储集空间,对准中地区油气早期成藏和晚期调整具有明显地控制作用。
Based on the analysis of the faults and distribution characteristics of the Jurassic strata in the mid-central China, the relationship between the faults and hydrocarbon accumulation is discussed. Due to the influence of tectonic movement of Yanshan Ⅰ and Yanshan Ⅱ curtains at the end of sedimentation of Xishanyao Formation and at the end of Jurassic, the intergranular faults of Jurassic are mainly formed before Xishanyao formation. Inverted faults, the current section presents normal faults and reverse faults co-exist. The inter-stratigraphic faults of the Jurassic structural strata generally developed in the study area, but their developmental scale and degree differed in different strata and in different blocks. The Jurassic interlaminar faults, the partial unconformities and the skeleton sand constitute shallow oil and gas migration systems, providing migration channels and reservoir space for the accumulation of oil and gas. The early hydrocarbon accumulation and late adjustment in the mid-alignment area have obviously Control effect.