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准噶尔盆地白家海地区侏罗系头屯河组河流相砂体是油气勘探开发的有利目标,目的层砂泥薄互层发育,为了提高储层识别率,对河道砂体进行分类刻画。以侏罗系头屯河组二段为例,将该区河道分为正常河道和废弃河道2个大类,从2类河道的单井、地震、电相特征出发,利用分频波阻抗反演技术对头屯河组二段进行平面刻画,结合实际钻探分析,认为废弃河道砂体为不利储层,废弃河道的存在是导致研究区岩性油气藏钻探相继失利的最主要原因。最后在平面上将2类河道加以区分,获得研究区目的层的有利储层分布范围,为下一步油气勘探提供了依据。
The fluvial facies sand body of the Toutunhe Formation of the Jurassic Totunhe Formation in the Baijiahai area of Junggar Basin is a favorable target for oil and gas exploration and development. The sand and mud thin interbedded layers are developed in the target layer. In order to improve the reservoir identification rate, the sand body of the channel is classified and described. Taking the second member of Toutunhe Formation of Jurassic as an example, the watercourse in the area is divided into two major categories: normal river channel and abandoned river channel. Based on the single well, seismic and electrical characteristics of the second channel river, Aiming at the second section of the Tuenhe Formation, the paper depicts the second section of the Tuenhe Formation. According to the actual drilling analysis, it is considered that the abandoned river sand body is an unfavorable reservoir and the existence of the abandoned river course is the main reason that the lithologic reservoirs in the study area have lost their drilling successively. In the end, two kinds of river courses are distinguished on the plane to obtain the favorable reservoir distribution range of the target area in the study area, which provides the basis for the next step of oil and gas exploration.