准噶尔盆地南缘霍—玛—吐构造带构造建模与玛河气田的发现

Structural modeling of the Huoerguoshi-Manashi-Tugulu thrust belt at the southern margin of the Junggar Basin and the discovery of the Mahe Gas Field

霍尔果斯—玛纳斯—吐谷鲁构造带属于准噶尔盆地南缘前陆冲断带第二排含油气构造单元,构造变形强烈,构造圈闭高点难以落实。为指导该区油气勘探工作,基于断层相关褶皱几何模型的构造解析方法,从玛纳斯背斜构造形成与演化分析入手,以地面地质和钻井构造数据为约束条件,建立了与实际构造特征吻合的几何模型,将复杂构造带构造解释的多解性限制在合理的范围内;通过正演平衡地质剖面制作,再现了霍—玛—吐构造几何变形的运动学过程,准确刻画了玛纳斯背斜构造形态,为玛河气田的发现提供了可靠的技术支持,指导了准噶尔盆地南缘冲断带霍—玛—吐构造的下一步油气勘探。

The Huoerguoshi-Manashi-Tugulu thrust belt with strong deformation belongs to the tectonic unit in the second row of the piedmont of southern margin of the Junggar Basin,which brings about great difficulty in the judgment of structural traps.Through structural analysis based on the geometry model of the fault related folding,a study was first performed on the formation and evolution of the Manashi anticline structure.Then,a geometry model was set up completely simulating the actual structure with outcrop observation and drilling data as the constraints,which helps restrict the multiple explanations on the complex structural belt to be within the reasonable range.Finally the geological profile was charted by forward balanced modeling to reconstruct the geometrical kinematics of the Huoerguoshi-Manashi-Tugulu thrust belt and accurately characterize the features of the Manashi anticline structure,which provides robust technical support for the discovery of the Mahe Gas Field and guides the further hydrocarbon exploration in this thrust belt.