乾西北地区指乾安油田西北部地区，区域构造上位于松辽盆地南部中央坳陷区次级构造单元长岭凹陷的北部。以高分辨率层序地层学原理为指导，依托95口探评井和461口开发井的测井、录井、分析化验等资料，完成全区地层划分与对比。青三段共分为12个砂组、42个小层。%Qianxibei area means northwest Qianan oilfield, regional structure is located in the south of Songliao Basin in the central depression area on the north of secondary tectonic unit in Changling Sag. Guided by the principle of high resolution sequence stratigraphy, based on logging, mud logging, analysis of test data of 95 exploration evaluation wells and 461 development wells, regional stratigraphic classification and correlation is completed. The member 3 of Qingshankou Formation is divided into 12 groups, 42 small layers.
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