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石南31井区位于准噶尔盆地腹部,井区下白垩统清水河组油藏为一新发现的高产油藏,尚未进行过层序地层学研究。根据三维地震信息、测井响应特征、岩心及岩屑录井资料,首次在清水河组识别出3个层序界面:一是清一段底面,即白垩系与侏罗系的分界面(SB1);二是清一段中KIq11-1与K1q11-2的界面(SB2);三是清二段顶面(SB3)。并根据这三个层序界面,划分出两个三级层序,自下而上为“层序I”和“层序II”。层序I包括清一段的第二砂层组和第一砂层组的K1q11-2,K1q11-3砂层;层序II则包括清一段第一砂层组的KIq11-1砂层和整个清二段。
Well Shinai 31 is located in the abdomen of Junggar Basin. The reservoir of Lower Cretaceous Qingshuihe Formation in the well area is a newly discovered high-yield reservoir, and no sequence stratigraphy has been studied. According to the 3D seismic information, logging response characteristics, core and debris log data, three sequence boundaries are identified for the first time in the Qingshuihe Formation: one is the bottom of the Qing-1 Member, that is, the interface between Cretaceous and Jurassic (SB1) ; The second is clear KIq11-1 and K1q11-2 in a section of the interface (SB2); third is clear the top of the second section (SB3). Based on these three sequence interfaces, two three-level sequences are divided into “sequence I” and “sequence II” from bottom to top. Sequence I includes a clear section of the second sand layer group and the first sand group K1q11-2, K1q11-3 sand layer; Sequence II includes a clear section of the first sand layer KIq11-1 sand layer and the entire clear two segment.