1.Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources,Langfang 065000,China; 2.State Research Center of Modern Geological Exploration Engineering Technology,Langfang 065000,China; 3.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China
Abstract：Previous studies show that frozen soil and fault are important reservoir-forming factors of natural gas hydrate in land-based frozen area. In order to study the fault and frozen soil distribution situations of natural gas hydrate in Muli area, the authors investigated distribution characteristics of frozen soil layer and fault structures of the study area through electromagnetic test. Based on electrical characteristics of resistivity profile of the test area in combination with geological setting, the authors recognized five groups of fault layers in the study area, with four of them possessing the biggest development scale. Frozen soil layer development area within the study area can be divided into 3 sub-areas, and fault layer structure development area can be divided into 4 sub-areas. The authors also analyzed the relationship between natural gas hydrate reservoir-forming condition, frozen soil layer and fault layer structures. By combination of frozen soil layer with area of developed fault layer structure, the authors infer that the east part from F3-3 to F3-5 and the place near F4 fault layer are natural gas hydrate reservoir-forming favorable areas.
