准噶尔盆地莫北凸起三工河组砂体成因及组合类型

Genetic Types of Sangonghe Sands and Assemblage Patterns of Mobei Arc in Junggar Basin

依据准噶尔盆地莫北凸起所有探井和开发井的岩心、录井及测井曲线,系统分析了侏罗系三工河组砂体的成因及组合类型。砂体成因类型包括:水下分流河道砂体、河口坝砂体、远砂坝砂体、席状砂砂体及滨浅湖滩坝砂体,其中水下分流河道砂体可进一步分为削截式水下分流河道砂体和完整式水下分流河道砂体。组合类型为叠置水下分流河道组合砂体、叠置河口砂坝组合砂体、水下分流河道-河口砂坝组合砂体、远砂坝-席状砂组合砂体、叠置滩坝组合砂体5种。分析认为,沉积物的供给方式及供给量以及可容纳空间动态变化是控制不同成因砂体组合时空分布规律的主要因素,这就为该区进行储集层预测提供了依据。

The genetic types and association patterns of Jurassic Sangonghe sands are analyzed based on core, mud logging and well log data of all exploration wells and development wells in Mobei arc of Junggar basin. The types of sands include subaqueous distributary channel sand, mouth bar sand, distal bar sand, front sheet sand, bank bar sand of shallow-shore lacustrine. The subaqueous distributary channel sand is subdivided into truncated and completed ones. The association patterns are composed of superimposed subaqueous distributary channel sand, superimposed mouth bar sand, assemblage of subaqueous distributary channel-mouth bar sands, assemblage of distal bar-front sheet sands and superimposed bank bar sand. This paper analyzes the time-space distribution of these sand assemblages with different origins, and determines that these sand assemblages are controlled by sediment supplies and varied holding capacities.