Seismic exploration of natural gas hydrate in Gemucuo surveying area,Qiangtang basin
XU Ming-Cai1, 2, LIU Jian-Xun1, 2, LI Pei1, 2, ZHANG Kai1, 2, WANG Kai1, 2, 3, WANG Xiao-Jiang1, 2, ZHANG Bao-Wei1, 2, WANG Guang-Ke1, 2, CHAI Ming-Tao1, 2, GAO Jing-Hua1, 2
1.National Modern Geological Exploration Technology Research Center,Langfang 065000,China; 2.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China; 3.College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China
Abstract：Gemucuo surveying area is on the northern margin of central uplift belt in Qiangtang basin.The results of regional geological survey of natural gas hydrate indicate that the area is provided with relatively good external gas source condition,transport tectonic condition,permafrost condition,reservoir and storage condition for generating gas hydrate and the delineation of the gas hydrate favorable block.In order to study the seismic method suitable for detecting gas hydrate and to better search for the distribution area of gas hydrate in the permafrost area,the authors carried out exploration work and contrast experiment of shallow and mid deep seismic reflection.The test results show that the characteristics of geological structure and stratigraphic distribution reflected in the shallow and mid deep seismic reflection profile are similar,except for that fact that the resolution is higher and the detection depth is shallower on the shallow seismic section.According to the results of the seismic exploration,the geological structure map of the survey area is made.On the basis of the geological data and other geophysical and geochemical data in the surveying area in combination with the attributes of reflection from known natural gas hydrate reservoirs in Muli surveying area,favorable distribution areas of natural gas hydrate are predicted,and the proposal of verification hole position is put forward.
