Validity of Hydraulic Fractures in the KL Volcanic Gas Reservoir
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Abstract
The volcanic formation is an important unconventional reservoir. KL volcanic gas reservoirs were discovered and the buried depth is about 3600 m. In this paper, complicated storage space and complex pore structure was briefly described. Then, volcanic mechanical properties were tested by tri_x0002_axial device; the static Young modulus is about 36 -52 GPa and Poisson ratio 0.194 to 0.205 respectively. Finally, based on fracturing pressure information, the in-situ stresses were interpreted about 51.7-64.4MPa; multiple fracture number is about 2 or 3 and the fluid leak-off coefficient can reach 7.8-9.2E-4m/m1/2; the dynamic fractures length varies from 75-107 m with average 88.53m, the effective fracture length is about 63.8m and the fracture conductivity is 12.34 D.cm by interpretation of well testing. Obviously, the effective fracture length are less than dynamic fracturing length.