High-Precision Depth Domain Migration Method in Imaging of 3D Seismic Data in Coalfield

Fault structures developed in coal seams, which are often associated with roof collapse, water inrush, gas outburst, and other accidents, common geological hazards exploration development. The accurate detection of micro-structures such as small faults has always been a research focus to ensure safety coalfields. Three-dimensional (3D) seismic is one the most efficient methods for obtaining structural characteristics areas identify but it difficult traditional data imaging technologies meet high-precision demand current exploration. Aiming at 3D coalfields, we calculated difference coefficients based on optimized inversion algorithm proposed variable-density acoustic equation temporal–spatial staggered-grid finite forward algorithm. On this basis, by combining normalized cross-correlation conditions GPU/CPU collaborative parallel processing technology, an reverse time migration method suitable Numerical tests verified accuracy efficiency coal-measure strata fault could effectively 5 m seam. test real coalfields showed that our good practicability effective precise measures.