TY - JOUR
T1 - A Method for Well Logging Identification and Evaluation of Low-Resistivity Gas Hydrate Layers
AU - Dong, Huaimin
AU - Sun, Jianmeng
AU - Arif, Muhammad
AU - Liu, Xuefeng
AU - Golsanami, Naser
AU - Yan, Weichao
AU - Cui, Likai
AU - Zhang, Yihuai
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (grant number 41874138) and China Postdoctoral Science Foundation Funded Project (grant number 2021M700525).
Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
PY - 2022/9
Y1 - 2022/9
N2 - The Muli area has dense lithology, high hardness, poor porosity and permeability, and well-developed micro-fractures, which is different from other gas hydrate regions with unconsolidated sediment characteristics. With the gradual deepening of gas hydrate scientific research in the Muli area, some unique low-resistivity gas hydrate phenomena have been discovered. The understanding of the genesis mechanism of low-resistivity gas hydrate is not clear, which makes it difficult to identify gas hydrate layers and adversely affects the evaluation of reservoir parameters and reserves prediction. In this investigation, the well logging response law of pore-filling and fracture-filling gas hydrate reservoirs is systematically combined and the associated reservoir characteristics relationships are evaluated as a function of lithology, physical properties, reservoir space, gas hydrate and fluid distribution characteristics. Then, the correlation between cementation index and pore structure complexity index was fitted. Finally, a new gas hydrate saturation calculation model is proposed. The results show that the new saturation calculation model is in good agreement with the well logging interpretation of gas hydrate, which can identify low-resistivity gas hydrate effectively. The results of this study thus assist in terms of reliable gas hydrate exploration in the Muli area.
AB - The Muli area has dense lithology, high hardness, poor porosity and permeability, and well-developed micro-fractures, which is different from other gas hydrate regions with unconsolidated sediment characteristics. With the gradual deepening of gas hydrate scientific research in the Muli area, some unique low-resistivity gas hydrate phenomena have been discovered. The understanding of the genesis mechanism of low-resistivity gas hydrate is not clear, which makes it difficult to identify gas hydrate layers and adversely affects the evaluation of reservoir parameters and reserves prediction. In this investigation, the well logging response law of pore-filling and fracture-filling gas hydrate reservoirs is systematically combined and the associated reservoir characteristics relationships are evaluated as a function of lithology, physical properties, reservoir space, gas hydrate and fluid distribution characteristics. Then, the correlation between cementation index and pore structure complexity index was fitted. Finally, a new gas hydrate saturation calculation model is proposed. The results show that the new saturation calculation model is in good agreement with the well logging interpretation of gas hydrate, which can identify low-resistivity gas hydrate effectively. The results of this study thus assist in terms of reliable gas hydrate exploration in the Muli area.
KW - calculation model
KW - cementation index
KW - gas hydrate saturation
KW - low-resistivity gas hydrate
KW - well logging identification
UR - http://www.scopus.com/inward/record.url?scp=85135612617&partnerID=8YFLogxK
U2 - 10.1007/s00024-022-03120-x
DO - 10.1007/s00024-022-03120-x
M3 - Article
AN - SCOPUS:85135612617
SN - 0033-4553
VL - 179
SP - 3357
EP - 3376
JO - Pure and Applied Geophysics
JF - Pure and Applied Geophysics
IS - 9
ER -
