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致密砂岩型岩性油藏的成藏机理是制约鄂尔多斯盆地延长组深入勘探的核心问题。综合利用储层岩石学、油气/油藏地球化学及盆地数值模拟领域中先进的技术与研究方法,从有效烃源岩出发,以压力场演化及其控制的流体动力学和运动学过程为核心,探讨了姬塬地区延长组长8油层组岩性油藏的成藏机理。结果表明,长8油层组原油主要来源于长7段及长8段的生烃有机质,油藏存在2期充注过程,以早白垩世晚期(105～95Ma)充注为主。210Ma以来,压力场经历了早期升高→中期迅速升高→后期降低的演化过程。早白垩世大量生烃及中晚燕山期构造挤压是超压发育的主要成因机制,受强超压控制,长8油层组岩性油藏呈现近源充注、隐性输导、快速聚集的成藏模式。
The forming mechanism of tight sandstone-type lithologic reservoirs is the key problem restricting the further exploration of Yanchang Formation in the Ordos Basin. Based on the comprehensive utilization of advanced techniques and research methods in the field of reservoir petrology, hydrocarbon / reservoir geochemistry and basin numerical simulation, starting from an effective hydrocarbon source rock, the evolution of the pressure field and its controlled hydrodynamics and kinematics are the core , Discussed the reservoir forming mechanism of lithologic reservoir of Chang 8 reservoir in Yanchang Formation in Jiyuan area. The results show that the crude oil of Chang 8 reservoir mainly comes from the hydrocarbon generating organic matter of Chang 7 and Chang 8, and there are two filling processes in the reservoir, mainly filling in the late Early Cretaceous (105 ~ 95Ma). Since 210Ma, the pressure field has undergone an early increase → the rapid increase in the middle → the evolution of the late decrease. Early Cretaceous massive hydrocarbon generation and mid-late Yanshanian tectonic extrusion are the main genesis mechanisms of overpressure development. Controlled by strong overpressure, the lithologic reservoirs in Chang 8 reservoir show near source filling, recessive transport and rapid accumulation Accumulation model.