Application of Geophysical Prediction Technology for Unconventional Gas Reservoirs in Carboniferous and Permian Coal Measures
The study area contains thick dark mudstone,carbonaceous mudstone,coal seam,and tight sandstone deposited in the carboniferous Permian coal measures.These formations are widely distributed with large areas and many blocks,indicating good potential for shale gas and tight sandstone gas.This study aims to identify potential blocks of unconventional gas accumulation through geophysical exploration in the study area,providing a basis for fu-ture geological work.By combining carboniferous seismic and geological horizon calibration,sedimentary facies analysis,generalized acoustic constrained inversion,and lithology filte-ring techniques,the reservoir prediction in the study area finds them effective.The sedimen-tary controlling factors and spatial distribution characteristics of the tight sandstone layer of the Lower Permian Shanxi Formation and the mudstone layer of the Upper Carboniferous Taiyuan Formation are identified.The results from reservoir thickness inversion guide well location deployment.Comparison between design borehole construction data and prediction results confirm the accuracy of unconventional gas reservoir prediction using generalized a-coustic wave constraint combined with sedimentary facies,which provides a scientific basis for exploration and development of unconventional gas in coal measures in the North China Plain while reducing exploration risk.
2D seismic datasedimentary faciesgeneralized acoustic constrained inversion reservoir predictionthe North China Plain