Eight sets of sand layer in the Cretaceous Qingshuihe Formation are penetrated at the east slope area of Chepaizi swell in Junggar Basin, each set of sand layer has good property with different degree oil-gas show. The relationship between the cretaceous Qingshuihe Formation each lithologic section and borehole-side seismic responses of the region were established By well connection seismic-geology fine sand layer calibration of horizon of many wells. Using 3D seismic data and combining the thickness and lithologic features of each underground penetrated sand layer, we carried out seismic recognition, contrast and fine explanation of each sand layer, and identified stratigraphic overlaped pinch outlines in Qingshuihe Formation of eight sets of sand layer in Chepaizi area, and the pinch outlines surround Chepaizi, distributing as a ring belt. Utilizing seismic frequency-division and inversion, the features that Qingshuihe Formation sand layer overlapped and pinched out from the east to the west surrounding Chepaizi swell were validated. Combining the structural setting, depositional systems and seismic attribute features, predicated the favorable exploration areas of Qingshuihe Formation in the region, and concluded that NW fault can be matched to stratigraphic overlap pinch outlines in the Cretaceous Qingshuihe Formation, and fan delta s development area should be the key area of oil and gas exploration.%准噶尔盆地车排子凸起东斜坡区井下钻遇白垩系清水河组8套砂层组,各套砂层物性良好,且都具有不同程度油气显示.通过多井精细砂层联井地震地质层位标定,建立了该地区白垩系清水河组各岩性段与井旁地震响应之间的相互关系,利用三维地震资料井结合井下钻遇各砂层厚度与岩性特征,对各砂层组进行地震识别、对比与精细解释,识别出清水河组8套砂层组在车排子地区的地层超覆尖灭线,该尖灭线围绕车排子凸起呈环带状分布.利用地震分频和地震反演方法验证了清水河组砂层由东向西沿车排子凸起超覆尖灭特征.综合构造背景、沉积体系和地震属性特征,对该地区清水河组油气勘探有利区进行预测,认为北西向断裂与白垩系清水河组地层超覆尖灭线匹配良好,且三角洲比较发育区应是该地区清水河组油气勘探的重点区域.
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