准噶尔盆地玛湖凹陷二叠系风城组碱湖型页岩油勘探进展

准噶尔盆地玛湖凹陷二叠系风城组页岩油具有良好的勘探前景与巨大资源潜力，是盆地下一步油气增产上储的重要战略接替新领域。通过回顾准噶尔盆地玛湖凹陷二叠系页岩油的勘探历程，应用地质、岩心分析、钻井、测井、录井与三维地震资料，剖析玛湖凹陷碱湖型页岩油的典型地质特征，系统总结页岩“甜点”的地球物理评价方法与储层改造技术，指出了准噶尔盆地玛湖凹陷风城组页岩油的未来勘探方向。研究表明：(1)玛湖凹陷风城组发育全球迄今最古老的广覆式碱湖型优质烃源岩，具有多源混积、孔隙—裂缝—缝合线三重储集介质、优势岩相控油与“甜点”分散的地质特征，其中风二段展示了良好的勘探前景。(2)创新形成了页岩油“甜点区”高分辨率地震预测、“甜点段”三品质测井综合评价与工程“甜点”配套储层改造3项关键核心技术，厘定玛湖凹陷风城组1200km²的“甜点区”，纵向识别17层“甜点段”。(3)针对目前勘探面临的关键问题，仍需强化风二段页岩油“甜点”的精细刻画，深入开展地质工程一体化技术攻关，以实现风城组页岩油的全面突破与规模效益勘探开发。

Exploration progress of alkaline lake type shale oil of the Permian Fengcheng Formation in Mahu Sag,Junggar Basin

Junggar Basin has abundant shale oil resources and promising exploration potential of the Permian Fengcheng Formation,which is expected to be a major strategic replacement field for increasing oil reserves and production.The exploration history of the Permian shale oil in the Junggar Basin is reviewed and the geological characteristics of alkaline lake type shale oil in Muhu Sag are analyzed by using geological,core lab test,drilling,mud logging,wireline logging and seismic data.Then the geophysical evaluation methods and reservoir stimulation technologies for shale oil“sweet spot”are systematically summarized.Finally,the shale oil exploration orientation of the Permian Fengcheng Formation is put forward.The study results show that:(1)The world’s oldest and the most extensive alkaline lake type high-quality source rocks of Fengcheng Formation are developed in Mahu Sag,with the characteristics of multiple provenances mixed deposition,triple types of reservoir spaces composed of pore,fracture and stylolite,shale oil accumulation controlled by favorable lithofacies and scattered“sweet spots”.Among them,the second member of Fengcheng Formation(Feng 2 member)shows a good exploration prospect.(2)Three key technologies such as the high-resolution seismic prediction of shale oil“sweet spot area”,“three qualities”logging comprehensive evaluation of“sweet spot interval”,and supporting reservoir stimulation technology of engineering“sweet spot”are innovatively developed.As a result,the“sweet spot area”of 1200 km² and“sweet spot interval”of 17 layers have been identified.(3)In view of the key issues in exploration,shale oil“sweet spot”of Feng 2 member is still need to be finely characterized,and the geology and engineering integrated technology be deeply researched,so as to realize the overall breakthrough and further large-scale benefit development of shale oil of Fengcheng Formation.