Abstract:

Time-depth conversion of seismic body is a key point in seismic structural interpretation and reservoir prediction. Because of the conventional time-depth conversion is with low-precision, it has partly influenced the welllocation arrangement and exploration scheme. The time-depth integration grid method, i.e. the top and bottom surface horizon time-depth relation was based on multi-well synthetics seismogram calibration, is proposed, after this method had carried out, the accumulative conversion errors can be reduced by the physical transportation of one to one correspondence on the time domain and depth domain meshes between the top and bottom, thus the waveforms and sand body features of seismic body and inversion body can be kept consistent. Using this method, the inversion results of northern Lamadian oilfield were transformed into depth domain, the distribution characters of sand body near fault were fine depicted, three horizontal wells, such as L213, were deployed. The results show that the prediction accuracy for the sand body is up to 98%, oil increment is more than 17 000 tons per year, and the accuracy and reliability of new time-depth conversion methods are well showed.

Key words: mesh model, time-depth conversion, seismic