Research On Method Of Seismic Data Acquisition For CBM In Loess Plateau Region Of West Shanxi Province In China

Southeastern margin of the Loess Plateau region of Ordos Basin contains a wealth of coalbed methane resources and the CBM exploration prospect is very broad.At present,there is no mature method for coalbed methane exploration and seismic data acquisition,the exploration methods for conventional oil and gas exploration are basically adopted in coalbed methane exploration.In Loess Plateau,the thickness of loess varies from a few meters to several hundred meters with 1oose texture and acute variation in thickness laterally and longitudinally.Influenced by long-term evaporative dehydration,thick loose loess layer seriously absorb and attenuate the seismic wave due to lack of moisture,which result in 1ow s/n ratio in the seismic data.Seismic data acquisition in Loess Plateau is still a world-class problems.In this paper,suitable methods of exiting and receiving for the complex surface,complex geological structure were summed up in the Loess Plateau region by a lot of experimental worked in Yan Chuannan,from survey design to surface structure investigation,also systematic analysis of exciting and receiving.Straight survey lines layout,small receiver interval,medium length spread,different combination exciting parameters varying with surface condition,which formed the effective method for CBM seismic data acquisition.Applying the conclusion of this article to the area in subsequent CBM seismic exploration,and obtained high—quality seismic data,has a very high value of reference and research.