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时深转换是三维地震勘探资料解释中最为关键的一步。提出在煤矿采区钻孔稀少情况下依托地质规律建立虚拟钻孔进行时深转换的方法,可以有效解决因钻孔稀少影响三维地震数据体平均速度场精度的问题,从而大大提高勘探区目的层时深转换的精度,将此方法应用于山东巨野煤田某采区三维地震勘探,其成果得到后期13个钻孔的准确验证。
Time-depth conversion is the most crucial step in the interpretation of 3D seismic prospecting data. The method of time-depth conversion by establishing virtual borehole based on geological laws under the condition of rare drilling in coal mining area can effectively solve the problem that the accuracy of the average velocity field of three-dimensional seismic data body is affected by the rare drilling hole, so as to greatly improve the target layer of the exploration area Time-to-depth conversion accuracy, this method is applied to a three-dimensional seismic exploration of a mining area in Juye Coalfield in Shandong Province, and the results are verified by 13 drilling holes in the later period.