霸县凹陷文安斜坡油气输导格架的三维表征

3D Representation of Petroleum Conduit Framework in Wen'an Slope of Baxlan Depression

文安斜坡在西倾缓坡背景上发育了北东向西掉断层、北东东向或近南北向东掉断层等2组主要断层,古近系发育辫状河三角洲、滨浅湖、辫状河及曲流河等沉积,长期活动的北东向顺向正断层与三角洲、河流砂体的空间配置构成了文安斜坡中浅层油气运移的"阶梯型"输导格架。以中期旋回层序划分油气运聚单元,建立初始地质概念模型,采用砂地比作为渗透性砂体输导性能的评价参数,以启闭性作为断层输导性能综合评价的基本参数。基于栅格数据模型构建了综合表征砂岩输导体、构造形态和断层分布的三维输导格架数字模型。与油气优势运移路径、钻井油层分布和油气显示的对应分析表明,该模型可准确地反映文安斜坡中浅层复杂断裂条件下的油气输导格架特征。

On the basis of west-inclined slope,There are two groups of main faults developed in Wen'an Slope,which is west dropped fault in north-east direction and east dropped fault in north-east-east direction or north-south direction.Multiple types of sediments such as braided delta,shallow lake,braided river and meandering river are developed in the Paleocene.The ladder-type petroleum conduit framework of shallow formation was composed of sand bodies and normal faults in north-east direction which droppes in the west for long time in Wen' an slope.Based on medium-term cyclic sequence,petroleum migration and accumulation unit is divided and initial geological conceptual model is established.The percentage of sand is used as evaluation parameter for conduit performance of permeability sandstone,and sealing performance as evaluation parameters of fault.A numerical model of three-dimensional conduit framework is built based on the raster data model,which demonstrates comprehensivly characterization of sandstone conductor,structure and fault distribution.On the basis of this model,The fine correlation between simulation results of dominant migration path and petroleum show that this model represents accurately the feature of oil and gas conduit framework.Under the condition of complex fracture in shallow formation of Wen'an Slope.