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鄂尔多斯盆地不同沉积地层中的断裂构造是影响油气、煤、砂岩型铀矿等多种能源矿产富集定位的一个重要因素。利用水平梯度最大模法、小波变换法、“去皮抽底”法、图像处理技术等多种方法,在不同沉积地层中提取高精度布格重力异常数据所反映的线性断裂构造的微弱信息,成果采用数字图像显示。识别出白垩系、侏罗系、三叠系、石炭二叠系、奥陶系地层中的线性断裂构造。分析断裂构造特征认为,盆地内沉积地层中断裂构造发育;断裂构造具有立体结构、似等间距排布;断裂构造密度在不同沉积地层中是上大下小,同一地层中是北疏南密。该方法不但为盆地断裂构造的研究提供了依据,而且为区域上油、气、煤、铀矿等多种能源矿产同盆共存的预测及协同勘探提供了参考。
The fault structure in different sedimentary formations in the Ordos Basin is an important factor that affects the enrichment and localization of various energy and mineral resources such as oil, coal and sandstone-type uranium deposits. The weak information of the linear fault structure reflected by the high-precision Bouguer gravity anomaly data was extracted from different sedimentary formations by using the methods of horizontal gradient maximum modulus method, wavelet transform method, “peeled and drained” method and image processing technique. Results using digital image display. The linear faults in the Cretaceous, Jurassic, Triassic, Carboniferous Permian and Ordovician strata are identified. According to the tectonic characteristics of the faults, the fault structures developed in the sedimentary strata within the basin. The fracture structures have three-dimensional structure and are arranged at equal intervals. The fracture structural density is small in the different sedimentary formations and is small in the north and in the same strata. This method not only provides the basis for the study of fault structure in the basin, but also provides a reference for the coexistence prediction and co-exploration of various energy resources in the area such as oil, gas, coal and uranium deposits.