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查干凹陷位于银额盆地东北角 ,依据地震、岩性、古生物、地化及测井等资料 ,其白垩系可划分出 1个一级层序、2个二级及 7个三级层序。巴音戈壁组一、二段沉积时期形成层序Ⅰ ,Ⅱ ;苏红图组沉积时期 ,形成层序Ⅲ ,Ⅳ ,Ⅴ ;银根组沉积时期形成层序Ⅵ ,Ⅶ。查干凹陷已有钻井显示 ,5 8 的油气层段分布于低位体系域中 ,30 的分布于高位体系域 ,12 的分布在湖侵体系域
The Chagan Sag is located in the northeast corner of the Yinbian Basin. According to the data of earthquake, lithology, palaeontology, geochemistry and logging, the Cretaceous can be divided into one first-order sequence, two second-order and seven third-order sequences . During the sedimentary period of the Suhongtu Formation, the sequence Ⅲ, Ⅳ and Ⅴ formed during the sedimentary period of the Bayingebi Formation, and the sequence Ⅵ and Ⅶ formed during the deposition of the silver root formation. Drilling wells in the Chagan Depression have shown that 58 oil and gas intervals are distributed in the lowstand system tract, 30 are distributed in the upper system tract and 12 are distributed in the lacustrine system tract