【摘要】 鄂尔多斯盆地东部下奥陶统风化壳为该区下古生界气藏的主力储层,勘探表明该气藏严格受古岩溶尤其是古沟槽的控制。前人用印模法识别沟槽,预测精度相对较低。采用新的三维地震古地貌研究方法,对富县区块的风化壳沟槽进行了识别。应用本方法不仅识别出了较大的主沟槽,而且还预测出了次级分支沟槽。预测结果为区内下古生界井位部署提供了依据,并提出了一套古沟槽三维地震识别的新方法。更多还原

【Abstract】 The carbonate weathering crust is a major gas reservoir of the Lower Paleozoic period in the eastern Ordos Basin.The petroleum exploration results proved that the reservoir properties were strictly controlled by palaeokarst,especially by the configuration of erosion flutes.The identification accuracy of the erosion flutes is relatively low using the conventional thickness methods.A new method for recognizing the erosion landform characteristics is proposed on the basis of the 3D seismic geomorphology.The application of the new method in Fuxian area of the eastern Ordos Basin provides the high-precision palaeokarsts distribution for the exploratory well planning.The combination of the 3D seismic geomorphology with the seismic attribute images is valuable for the identification of the Ordovician erosion flutes and can reduce drilling risks.The 3D seismic identification method is proposed for recognizing the erosion flutes.更多还原