1.2.3.4.

©

ATTENUATION OF P- AND S-WAVES AS A METHOD OF

DISTINGUISHING GAS AND

CONDENSATE FROM OIL AND WATER

KLIMENTOS, T

SOC EXPLORATION GEOPHYSICISTS, GEOPHYSICS; pp: 447-458; Vol: 60

King Fahd University of Petroleum & Minerals

http://www.kfupm.edu.sa

Summary

Compressional- and shear-wave attenuation data were calculated from sonic

waveforms in three wells. The results show that at similar porosities and at in-situ

conditions, gas and condensate sandstone reservoirs exhibit higher P-wave attenuation

(lower P-wave quality factor, Q(P)) than either fully-water or partially ''oil + water''

saturated sandstones. However, S-wave attenuation and quality factor es do not show

such a strong dependence on pore fluids. Furthermore, Q(P)/Q(S) < 1 indicates

presence of gas or condensate, while Q(P)/Q(S) - 1 indicates ''full water'' or ''oil +

water'' saturation. These field data are consistent with laboratory data and theoretical

predictions by various researchers. The crossovers of P-S-wave attenuation and Q(P)-

Q(S) quality factors proved useful for distinguishing gas and condensate from oil and

water reservoirs. They may be used in conjunction with V-P/V-S and other logs as an

aid in formation evaluation for the detection of gas, condensate, and oil. Several case

studies in the literature report high P-wave energy absorption at seismic frequencies

below gas and condensate pools. This suggests that it is not unreasonable to assume

that this method could also be used in seismic exploration as an aid for distinguishing

gas and condensate from oil and water formations.

References:ANSTEY NA, 1977, SEISMIC INTERPRETATIBALLAKH IY, 1970, GEOLOG NEFTI GAZA, V14, P56BIOT MA, 1962, J APPL PHYS, V33, P1482BOURBIE T, 1982, THESIS STANFORD U

Copyright: King Fahd University of Petroleum & Minerals;http://www.kfupm.edu.sa

5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.

©

BOURBIE T, 1984, 54 SEG M ATL US, P344CHENG CH, 1984, J GEOPHYS RES, V89, P3400CHURLIN VV, 1963, GEOLOG NEFTI GAZA, V7, P636DOBRIN MB, 1984, INTRO GEOPHYSICAL PRDUTTA NC, 1979, GEOPHYSICS, V44, P1777DUTTA NC, 1979, GEOPHYSICS, V44, P1789DUTTA NC, 1979, GEOPHYSICS, V44, P1806FRISILLO AJ, 1992, 54TH ANN INT M EUR A, P246FRISILLO AL, 1980, J GEOPHYS RES, V85, P5209GARDNER GHF, 1964, J PETROL TECHNOL, V16, P189JONES TD, 1986, GEOPHYSICS, V51, P1939KLIMENTOS T, 1988, 58TH ANN INT M SOC E, P933KLIMENTOS T, 1988, THESIS U READINGKLIMENTOS T, 1990, GEOPHYSICS, V55, P998KLIMENTOS T, 1991, GEOPHYSICS, V56, P1930MARTINEZ RD, 1987, GEOPHYSICS, V52, P1033MARTINEZ RD, 1991, GEOPHYS PROSPECT, V39, P141MARTINEZ RD, 1991, GEOPHYS PROSPECT, V39, P157MARTINEZ RD, 1991, GEOPHYS PROSPECT, V39, P157MAVKO GM, 1979, GEOPHYSICS, V44, P161MURPHY WF, 1982, J ACOUST SOC AM, V71, P1458MURPHY WF, 1986, GEOPHYSICS, V51, P757NORTH FK, 1985, PETROLEUM GEOLOGYNORTH FK, 1985, PETROLEUM GEOLOGYOCONNELL RJ, 1977, J GEOPHYS RES, V76, P2022PALMER ID, 1980, GEOPHYSICS, V45, P1780ROEVER WL, 1974, J ACOUST SOC AM, V55, P1144SAMEC P, 1992, GEOPHYSICS, V57, P441SENGBUSH RL, 1983, SEISMIC EXPLORATIONSPENCER JW, 1979, J GEOPHYS RES, V84, P7521TANER MT, 1977, AM ASS PETR GEOL MEM, V26, P301WHITE JE, 1975, GEOPHYSICS, V40, P224WHITE JE, 1983, UNDERGROUND SOUND APWIDESS MB, 1973, GEOPHYSICS, V38, P1176WINKLER K, 1979, GEOPHYSICAL RES LETT, V61, P1WINKLER KW, 1979, THESIS STANFORD UWINKLER KW, 1982, GEOPHYSICS, V47, P1

For pre-prints please write to: abstracts@kfupm.edu.sa

Copyright: King Fahd University of Petroleum & Minerals;http://www.kfupm.edu.sa