Shaanxi Coalfield Geophysical Surveying and Mapping Co., Ltd.
Key Laboratory of Coal Exploration and Comprehensive Utilization, Ministry of Land and Resources

我国西部地区煤层倾角大于30°的煤炭资源相当可观。为了提高陡倾角煤田地震勘探采集资料品质,通过研究分析倾斜地层地震反射波时距曲线特征,建立陡倾角单斜地质模型并进行3种不同观测系统(中点放炮、下倾方向放炮上倾方向接收和上倾方向放炮下倾方向接收)设计,同时采用射线追踪方法进行地震波场正演模拟。通过对比分析3种不同观测系统对应地震波场和叠加时间剖面特征,总结出适合陡倾角单斜地层地震勘探观测系统设计方法。将适合陡倾斜地层的地震勘探观测系统设计方法应用到实际地震勘探资料采集工作中,取得了较为理想的地震资料。

The coal resources with the dip angle of greater than 30 degrees in the western region of China are quite considerable. In order to improve the quality of seismic exploration and acquisition data in steep dip coal fields, we study and analyzethe time-distance curve characteristics of seismic reflection waves in inclined strata, and establish a steep dip monoclinic geological model to design three different observation systems( midpoint shooting, lower-dip direction shooting, upper-dip direction receiving, and upper-dip direction shooting, lower-dip direction receiving) . At the same time, the ray tracing method isused for seismic wave field forward simulation. By comparing and analyzing the seismic wave field and superposition timeprofile characteristics for three different observation systems, a design method suitable for seismic exploration observationsystems in steep dip monoclinic strata is summarized. The design method of seismic exploration observation system suitablefor steep inclined strata has been applied to practical seismic exploration data acquisition work, achieving ideal seismic data.