CEMP勘探在鄂尔多斯西缘前陆盆地的应用效果

Application of CEMP Method in Foreland Basins on Western Margin of Ordos Basin

鄂尔多斯盆地西缘前陆盆地属典型的黄土塬地貌,地表黄土切割剧烈,地下地质构造复杂,地震勘探难度较大。利用电磁阵列剖面(CEMP)法,通过多项反演,认识该区的断裂特征、基底特征、盖层特征。结合其他物探资料,对该区的有利目标区作出预测。特别是对鄂尔多斯西缘前陆盆地逆冲断裂带结构的分析和推测,弥补了地震资料较差区和空白区在该区域认识上的不足。实践证明,利用CEMP法在黄土塬、复杂山区进行勘探,可以获得丰富可信的地质成果,为查明盆山接触关系、目的层构造形态及预测油气有利区提供重要的依据。

The foreland basins located on western margin in Ordos Basin are featured by typical loess knap physiognomy with sharp incision on ground. Although seismic survey was of poor effect due to complex underground structures there, features of faults, basement and cover have been studied by Continuous Electric and Magnetic Profile (CEMP) method combined with powerful inversion technique. With reference of other geophysical data, some favorable objects in the area were predicted and several advantageous local structures were ascertained. Analysis and speculation about thrust faults' structure in the area, which were concluded from CEMP data, solved the problems of poor seismic data and blank regional information in the forelands. It was practically proved that CEMP data can provide plentiful and reliable geological information in loess knap area and complex mountains area, which can provide important evidences for study of target structures, contact configuration of basins and mountains and promising oil-gas prediction.