古地貌恢复及对流体分布的控制作用——以鄂尔多斯盆地高桥区气藏评价阶段为例

目前常用的古地貌恢复方法对于油气田的勘探开发起到了重要的指导作用，但是这些方法也存在着不足之处。在综合分析常用古地貌恢复方法的基础之上，结合各自的优点，形成了“双界面”古地貌恢复新方法。该方法以确定上覆地层标志面和下伏地层基准面作为古地貌恢复方法的基础，以完钻井和地震资料分别求取地貌值为核心，绘制古地貌值的平面分布图，实现了古地貌恢复的半定量化。最后依据区域古地貌分析结果，进行古地貌单元的划分。该方法操作方便、准确快捷。同时依据古地貌划分结果及分布特征，分析了古地貌对流体分布的控制作用，有效指导了油气田富集区优选和产能建设。

Paleotopography restoration method and its controlling effect on fluid distribution: a case study of the gas reservoir evaluation stage in Gaoqiao,Ordos Basin

The commonly used paleotopography restoration methods have played an important guiding role in the exploration and development of oil and gas fields, but they still have certain deficiencies. Through comprehensive analysis of the commonly used restoration methods, a double-interface restoration method was innovatively developed based on the advantages of each method. This method is based on determining the marker horizon of overlying strata and the base level of underlying strata and mainly depends on the calculation of landform value using complemented well and seismic data, by which the contour map of planar distribution of paleotopographic values was drawn, so as to achieve the semi-quantitative paleotopography restoration. Finally, the paleotopographic unit division was conducted according to the regional paleotopography analysis results. The method is easy, accurate and efficient. Meanwhile, the controlling effect of paleotopography on fluid distribution was analyzed according to its division results and distribution characteristics, effectively guiding the optimization and productivity construction of enrichment zone in oil and gas fields.