塔南凹陷19区块南二段油水的分布特征与成藏模式

Study on law behind oil and water distribution and accumulation pattern in second member of Nantun formation of block 19 of Tanan Basin

塔木察格盆地断裂复杂,物源来自多个方向,受多期次的构造运动影响,断层复杂,构造破碎,有着很强的非均质性,对于油水分布规律与成藏模式的研究难度较大。通过研究塔南凹陷的构造格局与生、储、盖条件,建立了油气沿反向断层垂向至高部位聚集成藏的成藏模式。研究结果表明:不同类型局部构造是油气重点潜力区,反向断层控制油气聚集成藏,高部位是油气富集区,反向断层下降盘仍有一定的含油潜力。油气运移是油气充注以高部位“呈伞状”优先充注,其中,烃源内,排烃强大,构造高部位优先成藏;烃源外,油源条件相对有限,油源断层、砂体、不整合面长距离运移聚集成藏。

This paper is an attempt to address the notorious difficulties challenges imposed on an investigation into oil-water distribution law and reservoir-forming mode by more complex faults and provenance from multiple directions in tamucag basin,the complex faults and the broken structures resulting from influence multiple periods of tectonic movement and a consequent stronger heterogeneity.The paper describes the development of the accumulation model of hydrocarbon accumulation along the reverse fault by an in-depth study of the structural pattern and generation,storage and cap conditions of tanan sag.The research results show that different types of local structures are key potential areas of oil and gas;oil and gas migration refers to that oil and gas filling takes priority in the form of"umbrella"in the high position.Among them,hydrocarbon emission is strong in the source of hydrocarbon,and accumulation is preferred in the high position of structure;while in the source of hydrocarbon,oil source conditions are relatively limited,and long-distance migration and accumulation of oil source faults,sand bodies and unconformity surfaces.