鄂尔多斯盆地G区块位于伊陕斜坡南部,构造平缓,断裂不发育。下奥陶统马家沟组为海相碳酸盐岩沉积环境,前人研究表明马家沟组储层品质是影响其成藏的主要因素,古岩溶斜坡带储层品质较好,为其成藏有利区。为了展现马家沟组顶部构造特征,寻找储层有利区,根据G区二维地震资料,进行地震品质分析、测井特征分析,使用频次直方图法对测井曲线进行一致性校正,在此基础上对各井进行精细标定,并完成该区的地震解释;利用测井速度曲线,构建G区块速度场,绘制马家沟组顶部深度域构造图,并最终给出储层有利区的预测。 Block G of the Ordos Basin is located in the southern part of the Iraqi-Shaanxi slope with gentle structure and undeveloped faults. The Lower Ordovician Majiagou Formation is a marine carbonate depositional environment. Previous studies have shown that the reservoir quality of the Majiagou Formation is a major factor affecting its hydrocarbon accumulation. The quality of the reservoir in the paleokarst slope zone is good Benefit zone accumulation. In order to show the structural features of the top of the Majiagou Formation and to search for the favorable areas of the reservoir, the seismic character analysis and logging feature analysis were conducted based on the 2D seismic data in area G, and the log histograms were used to correct the consistency of the logging curves. Based on the well calibration of each well and the seismic interpretation of the area, the velocity field of G block is constructed by using the logging velocity curve to draw the top depth structure map of Majiagou Formation, and finally the favorable area of ​​reservoir prediction.