Thermophysical Properties of Methane Hydrate-bearing Sediments Recovered from Nankai Trough Wells Under Vertical Stress Conditions

Morita, Hiromitsu; Muraoka, Michihiro; Yamamoto, Yoshitaka

doi:10.17736/ijope.2019.jc739

Cited by 2 publications

(2 citation statements)

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“…Morita et al. (2019) measured an MH‐bearing sediment core from Nankai Trough, as well as the thermal properties under vertical stress loading that ranged from 0.06 to 3.36 MPa. Although the natural core data number is only one, the thermal conductivity increased by 11.6% with an increasing vertical stress.…”

Section: Introductionmentioning

confidence: 99%

“…The random distribution model cannot estimate the thermal conductivity of the unsaturated sample (Muraoka et al, 2015), but the de Vries model can. Unfortunately, Morita et al (2019) experimented with only one natural unsaturated core sample and did not show whether the de Vries model can estimate both the thermal conductivities of MH-bearing sediment cores before and after the MH dissociation. Additional thermal conductivity studies on the MH-bearing core samples before and after MH dissociation are needed to evaluate the applicability of the de Vries model to the MH-bearing saturated and unsaturated core samples considering the MH dissociation.…”

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confidence: 99%

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Thermal Properties of Pressure Core Samples Recovered From Nankai Trough Wells Before and After Methane Hydrate Dissociation

Muraoka

Yoneda

Jin

et al. 2023

Earth and Space Science

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The thermal properties of methane hydrate (MH)‐bearing sediments are necessary for developing gas production technologies (e.g., gas production rate prediction). The direct thermal property measurement of a general MH reservoir is difficult because it demands an advanced coring and measuring technology. Therefore, a good thermal property value estimation model for a system containing sediment grains, water, MH, and gas is necessary. In 2018, the pressure core samples were recovered from the AT‐CW1 and AT‐CW2 wells in Nankai Trough of Japan. Using a single‐sided transient plane source method, we measure herein the thermal property values of those core samples and estimate their thermal conductivity by improving existing models. The measured thermal conductivity (λ), specific heat (ρCp), and thermal diffusivity (α) of the MH‐bearing sediments before and after MH dissociation are obtained. The de Vries model agrees well with the measured thermal conductivity values before and after the MH dissociation. For the random distribution (geometric mean) model, the difference between the estimation values and the data after the MH dissociation increases as the gas saturation Sg′ increases. In the worst case, the distribution model shows an 87.6% error, while the de Vries model yields 5.2% of the same. We propose and use an estimation method of the thermal property values in an MH reservoir, which requires classical thermophysical models and well log data. The in‐situ thermal property values can be estimated when the log data are highly accurate.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%