【摘要】 鄂尔多斯盆地西南部延长组浊积砂体横向相变快,地震识别困难,严重制约了研究区内浊积岩油气藏的勘探。笔者首先根据研究区浊积砂岩特征、沉积模式建立概念化地质模型,合成地震响应,并用实际地震资料与其进行对比验证,得出地震剖面上三角洲前积反射的前缘倾没端为寻找浊积砂体的有利部位;在此基础上,综合利用地震、钻/测井资料设计地质模型,并进行地震正演模拟,与实际地震资料进行分析对比,总结了研究区浊积砂层组的地震反射特征为丘状反射型和孤立短反射型,为定性解释和预测研究区浊积砂层组的分布提供了依据。更多还原

【Abstract】 In the Yanchang Formation of the south Ordos Basin,the lateral changes of turbidite sandbody was quick,seismic identification was difficult,the turbidite reservoir exploration was constrained severely.Based on regional characteristics of the turbidite sandbody,and its depositional patterns,a conceptual model was established,seismic response was synthesized and seismic data were used for a comparison,a front pitching end of delta progradation on the seismic profile was established as a beneficial area for searching turbidite sandbody.On the basis stated above,seismic drilling and logging data are integrally used to design a geological model and a forward seismic modeling is performed,the result is contrasted with that of seismic data,the characteristics of seismic reflection of the regional turbidite sand formation are summarized as moundy reflection and isolated short reflection,by which a basis is provided for quantitatively interpretating and predicting the turbidite sand formation in the region.更多还原