Unconventional gas seismic exploration acquisition technology:A case study of the middle east Qinshui coalfield
TIAN Zhong-Bin1,2, SHEN You-Yi2, WANG Jian-Qing2, CHENG Hui-Hui2
1. School of Geosciences and Info-Physics, Central South University, Changsha, Hunan 410083, China;
2. Coal Geological Geophysical Exploration Surveying & Mapping Institute of Shanxi Province, Jinzhong 030600, China
The middle-east area of the Qinshui coalfield is located in eastern Qinshui block depression, where terrain undulates obviously and the surface lithology is changeful. The anisotropy of shallow surface causes more impact on the efficient detection of the coalbed methane and shale gas in the seismic exploration. How to choose the excitation and receiving parameters becomes the main difficulty. In this paper, the methods of micro logging and refraction encounter were used to investigate the structures of shallow and surface. According to well logging data, the authors determined the reasonable excitation horizon so as to assure the exploration-grains explosion in the bedrock or dense clay layer; the excitation parameters of well depth, charge mass and well combination of different lithologies were obtained through the study of the systematic test of excitation and receiving condition; through the analysis of the test data,the authors chose the combination of low frequency detectors and built the recording geometry with multifold. Practices prove that the excitation and receiving parameters of this region can suppress the interference waves such as the surface wave and the multiple refraction wave and can resolve the problem of low signal-to-noise ratio in mountainous areas, especially in loess areas. The results obtained by the authors provide useful references for the exploration and development of unconventional natural gas in the future.
田忠斌, 申有义, 王建青, 程慧慧. 非常规气地震勘探采集技术——以沁水煤田中东部煤系为例[J]. 物探与化探, 2016, 40(1): 167-173.
TIAN Zhong-Bin, SHEN You-Yi, WANG Jian-Qing, CHENG Hui-Hui. Unconventional gas seismic exploration acquisition technology:A case study of the middle east Qinshui coalfield. Geophysical and Geochemical Exploration, 2016, 40(1): 167-173.