通过野外剖面和钻井岩心观察、测井曲线和镜下微相分析认为,塔里木盆地大宛齐油田上第三系康村组是一套以低弯度河注入极浅水湖泊形成的三角洲沉积体系。在大宛齐油区识别出了三角洲平原和三角洲前缘两个亚相并从中进一步划分出了8种微相,查明了康村组岩性由不同粒级的岩屑砂岩的组成,分流河道砂体、水下分流河道砂体和河口砂坝砂体是油气的主要储集层,储层在纵向上多期叠置、在横向上频繁迁移、尖灭和连续性较差。

 By survey of filed geological section and many of core and analysis of well-log ging data and microfacies in the microscope, we think that formation of Kangcun  group in Neogene period in area of Dawanqi，Tarim basin are a delta sedimentary  system which form where a lowsinuosity river flew into an in-land lake with ver y shallow water. The sand bodies are made of lithical sandstone with different size. Delta place subfacies and delta front subfacies has been distinguish in the  range of oil fields, they were subdivided into 8 kinds of microfacies. Reservoi r sand body mainly consist of distributary channel sand，subaqueous distributary  channel sand and distributary mouth bar sand．They are vertically characterized  by multiple superimposition and laterally by frequent migration, tapering out a nd lower continuity.