Identification of pore-filling and fracture-filling hydrate by petrophysical simulation and acoustic experiment

JING Pengfei; HU Gaowei; BU Qingtao; CHEN Jie; WAN Yizhao; MAO Peixiao

doi:10.16562/j.cnki.0256-1492.2019122501

Marine Geology & Quaternary Geology > 2020 > 40(6): 208-218. > DOI: 10.16562/j.cnki.0256-1492.2019122501

JING Pengfei, HU Gaowei, BU Qingtao, CHEN Jie, WAN Yizhao, MAO Peixiao. Identification of pore-filling and fracture-filling hydrate by petrophysical simulation and acoustic experiment[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 208-218. DOI: 10.16562/j.cnki.0256-1492.2019122501

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Identification of pore-filling and fracture-filling hydrate by petrophysical simulation and acoustic experiment

JING Pengfei^1,2,,
HU Gaowei^1,3, ,,
BU Qingtao^1,3,
CHEN Jie¹,
WAN Yizhao^1,3,
MAO Peixiao^1,2

1.
Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China
2.
Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

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Received Date: December 24, 2019
Revised Date: March 09, 2020
Available Online: December 17, 2020

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Abstract

Abstract

Pore-filling and fracture-filling are two of the basic occurrences of natural gas hydrates in nature. To discriminate the type of gas hydrate is critically important for resource assessment, drilling safety and environment evaluation. In this paper, simulation experiment was carried out for the pore-filling and fracture-filling hydrate reservoirs in the South China Sea. The acoustic velocity and density of the two kinds of hydrate are obtained by petrophysical simulation and acoustic experiment simulation. The results suggest that the P wave velocity of the depositional mediums containing pore-filling and fracture-filling hydrate tends to increase with the volume fraction of hydrate, while the density decreases. Furthermore, we tested the impedance and the $\rho {\sqrt V _{\rm{p}}}$ property of the two types of hydrate by combining velocity and density parameters together. The results also show that for the pore-filling hydrates, the properties of $\rho {\sqrt V _{\rm{p}}}$ calculated by the petrophysical models and experimental $\rho {\sqrt V _{\rm{p}}}$ both show positive slope, while The $\rho {\sqrt V _{\rm{p}}}$ property of the fracture-filling hydrate shows negative slope. However, the differences between the model and experiment results of fracture-filling hydrate are obvious when the volume fraction of gas hydrate is less than 40%. It means that the petrophysical for fracture-filling hydrate needs to be further improved. In addition, pore-filling and fracture-filling hydrate in GMGS2-16 Site has been verified by the property of $\rho {\sqrt V _{\rm{p}}}$ . The results show that the hydrate in the upper part of the well is mainly fracture-filling hydrate, as the bottom dominated by pore-filling hydrate. The verification has been confirmed by actual drilling results.
- hydrate,
- pore-filling,
- fracture-filling,
- petrophysical simulation,
- acoustic experiment

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References

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Identification of pore-filling and fracture-filling hydrate by petrophysical simulation and acoustic experiment