测井约束2D地震反演预测煤层及上部砂岩厚度

摘要

为了查明研究区主要煤层和上部砂岩储层的分布发育情况,掌握区内基本的煤层和天然气基本地质条件,利用测井约束二维地震反演预测煤厚、砂厚的方法,较大程度地提高了煤层及上部砂岩厚度预测的精度,为煤层气基础地质研究、下一步煤层气与致密砂岩气等的勘探部署提供了较为准确的地震地质参数和井位部署依据.通过在山西宁武地区实际应用,结果表明:测井约束二维地震反演方法,能够综合利用测井在纵向上的高分辨率和地震资料在横向上的高分辨率,较大程度地提高了煤层及上部砂岩厚度预测的精度,为二维地震勘探区解决煤层和上部砂岩厚度问题提供了较为有效的解决方案.%In order to grasp the basic geological conditions of coal seams and natural gas, it is necessary to investigate the distribution of the main coal seam and the upper sandstone reservoirs in the study area. The thickness prediction method of coal seam and upper sandstone, by using logging constrained 2Dseismic inversion, greatly improve the prediction accuracy. The results provide the basic for the research on basic geology of coal seam gas and the providing of accurate seismic geological parameters and well position for the next exploration and deployment of coal seam gas and tight sandstone gas. Through the practical application in the Shanxi Ningwu area, the results showed that the logging constrained 2D seismic inversion method, compresively using the high resolution of well logs in the longitudinal direction and the high resolution of seismic in the transverse direction, greatly improves the precision of the thickness prediction of coal seam and the upper sandstone. It provides an effective solution for the predication of the thickness of coal seam and the upper sandstone in 2Dseismic exploration area.