Research On High-density 3D Seismic Exploration Acquisition Parameters In Coal Mining Area

3D seismic exploration method plays an important role in coal geological exploration,mainly used in coal mining in the detection of geological structure,especially in response to the collapse column,fault and so on,compared to other geophysical detection method is more sensitive,but due to non-technical and technical factors,cause a drop in accuracy of interpretation result.With the rapid development of information technology and multi-channel seismic instruments,it is proposed to increase the spatial sampling density to increase the collection of wave field information,so as to improve the accuracy of later interpretation.Under this background,high-density 3D seismic exploration technology arises at the historic moment.In this paper,the basic principle,observation system and technical characteristics of highdensity 3D seismic exploration are summarized by sorting out the existing public literature.Then carry out the demonstration of acquisition parameters in the study area,designing an observation systems that conform to the results of the demonstration of acquisition parameters,compared the differences between different observation systems in terms of bin element uniformity and economy,and choosing an economical and reasonable observation system.In view of the large number of collapsed columns developing in this study area,threedimensional collapsed columns seismic geological model is established according to the geological background of the study area,3D seismic numerical simulation is carried out,designing different kinds of observation system,contrasting its interpretation accuracy from different line direction,and different interpretation method,following conclusions are drown:(1)On the premise that parameters such as gunpoint distance,gunplatoon distance,receiving point distance,azimuth angle and maximum gun distance remain basically unchanged,the coverage times can be changed by reducing the receiving line distance.By comparing the simulation results,it is found that there is no difference between the number of cover times in the time section of collapse column,and the number of high cover times is better than that of low cover times in the attribute interpretation section.(2)On the premise that the three parameters of gunpoint distance,gunplatoon distance and receiving point distance remain unchanged,.The azimuth angle of the observation system is changed by reducing the receiving line distance,By comparing the simulation results,wide azimuth angles are better than narrow azimuth angles for the interpretation of collapsed columns in both time profiles and attribute slices.(3)On the premise of keeping the same number of coverage and little difference in azimuth,change the size of surface element by changing the distance between shot and receiving points.Compared with observation systems of different bin element sizes,observation systems of small bin element have better interpretation results than the large bin element in section,and small bin element has more clear and smooth boundary response to collapse column in attribute section.