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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0326560 (1994-10-20) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 314 인용 특허 : 0 |
A lithology-independent method of well logging to estimate the pore size within a formation containing natural gas. The method makes use of a pulsed NMR logging tool utilizing a recovery time that is greater than the relaxation time of hydrocarbon gas within the formation. In a preferred embodiment,
A lithology-independent method of well logging to estimate the pore size within a formation containing natural gas. The method makes use of a pulsed NMR logging tool utilizing a recovery time that is greater than the relaxation time of hydrocarbon gas within the formation. In a preferred embodiment, two different NMR logs are obtained: one with a recovery time significantly shorter than the longitudinal relaxation time, T1, of the gas and one with a recovery time equal to or longer than T1. The amplitudes of the two logs are subtracted to determine a restricted diffusion coefficient of the gas. The restricted diffusion coefficient can then be used to estimate pore size and permeability of the formation by means of a relationship between measured restricted diffusion coefficient, surface to volume ratio, and estimated bulk diffusion ratio of the gas.
A method to estimate the pore size within a formation containing hydrocarbon gas, the hydrocarbon gas having a longitudinal relaxation time, the method comprising the steps of: obtaining a pulsed NMR log using a recovery time that is equal to or greater than the longitudinal relaxation time of the h
A method to estimate the pore size within a formation containing hydrocarbon gas, the hydrocarbon gas having a longitudinal relaxation time, the method comprising the steps of: obtaining a pulsed NMR log using a recovery time that is equal to or greater than the longitudinal relaxation time of the hydrocarbon gas; determining, from the NMR log using a recovery time that is equal to or greater than the longitudinal relaxation time of the hydrocarbon gas, a distribution of transverse relaxation times; determining from the distribution of transverse relaxation times a restricted diffusion coefficient of hydrocarbon gas within the formation; and estimating from the restricted diffusion coefficient of hydrocarbon gas within the formation the pore size within the formation.
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