IMPROVED METHOD IN THE DESIGN OF 3-D SEISMIC GEOMETRY IN LARGE OBSTACLE MOUNTAIN AREA
Xiansong Zhang, Cnpc Sichuan · Computing Techniques for Geophysical and Geochemical Exploration · 2010
In high-steep structure area seismic exploration,layout observation system in the large obstacles mountain area needs to be dynamic adjustment observation system design in order to avoid seismic reflection profile appeared discontinuous because of surface and to cross over obstacle (the reservoir,mining area etc) to ensure the bins to have uniform attributes and optimally depress the noises and gain good reflection seismic data.The content of paper is based on participating in the research of observation system in the large obstacles area and present a set of methods from optimal adjustment physical points that receiving-lines replacement shot-lines.The basic ideas as follows:using Green Mountain Design software and seismic surveying result to do repeated adjustment of dynamic designed regular geometry to avoid the obstacles as far as possible and to compute distributed situation of folds,offset and azimuth and design irregular geometry suitable for obstacle areas.Some designing principles are summarized associated adjusted methods and auxiliary tools are given in the paper.The method of save cost,effective receiving and shooting in safety way going through larger obstacles is proposed which successfully solve the problems by reasonable configuration and adjustment of shot-points and receiver-points,and ensure the high signal to noise ratio of seismic data.