煤矿采区钻孔稀少情况下三维地震勘探时深转换的方法研究

Research on Time-depth Transform Method of Three-dimensional Seismic Exploration in Case of Sparse Boreholes in Coal Field

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 transform is the most crucial step in the three-dimensional seismic information interpretation. The method of relying on the law of geology to create virtual boreholes conducting timedepth transform in the case of sparsely borehole in coal field can effectively solve the problem of the average velocity accuracy of three-dimensional seismic data in the case of sparse boreholes, thus greatly improving the time-depth transform accuracy of the target zone. This method was applied in the three-dimensional seismic exploration in Juye coalfield, and the results obtained accurate verification about the later 13 boreholes.