High-resolution Seismic Surveying in the Yongcheng Coal Field, Henan Province
Tang Wenbang, 1989. "High-resolution Seismic Surveying in the Yongcheng Coal Field, Henan Province", An Overview of Exploration Geophysics in China — 1988, Zhao Jingxiang, Wang Yanjun, Fu Xuexin, Stanley H. Ward
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A new definition of the resolution of a thin coal seam is given, and the requirements for obtaining a strong reflection from the thin coal seam are described. The resolution and requirements presented differ from those given in earlier literature. Using a seismic test conducted at the Yongcheng coal field in Henan Province as an example, the main features of a high-resolution seismic survey in a coal field are discussed. By increasing the frequency range and broadening the bandwidth of the seismic source the results show strong reflections from a single thin seam ranging from 2 m to 4.7 m in thickness. Additionally, strong reflections were obtained from coal measures consisting of two seams each 1.5 m thick. Because thin seams are thus routinely detected, the capability now exists for investigating the structural forms of seams as well as for identifying faults of small throw. A basis for research into the properties and variations of seams has now been laid.