Fluid-Rock Characterization and Interactions in NMR Well Logging

Hirasaki, George J. ; Mohanty, Kishore K.

National Petroleum Technology Program (U.S.)

关键词: Natural Gas;    Hydrocarbons;    02 Petroleum;    Propane;    Nuclear Magnetic Logging;   

DOI  :  10.2172/782901
RP-ID  :  DOE/BC/15201-2
RP-ID  :  AC26-99BC15201
RP-ID  :  782901

美国|英语

来源: UNT Digital Library

【 摘 要 】

This semi-annual report briefly summarizes the progress since the 1st Annual Report issued September, 2000 and the next annual report. More detailed results will be in the annual reports. The main emphasis on fluid properties was on measurements of the relaxation time and self-diffusion coefficient of ethane and propane. Ethane is similar to methane while propane is more similar to the higher alkanes. The ratio of T1 and T2 is demonstrated to be a function of both viscosity and the NMR frequency. The diffusion-induced T2 in a uniform magnetic gradient was simulated in one dimension to seek improved understanding NMR diffusion in restricted geometry. Analytical solutions can be found for this system if the correct region of validity is used. Estimation of permeability of vuggy carbonates has been problematic because the pore body size does not correlate well with pore throat size. CT scans and CPMG NMR measurements were made on a set of vuggy carbonate rocks.