Porosity

• Al-Waheed, H.H., Ballay, R.E., and Audah, T.M., 1994, Porosity log quality control and interpretation in a high porosity carbonate reservoir: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. E1-E20.



• Barlai, Zoltan, 1970, Well logging parameters of hydrocarbon-bearing sandstones composed of sand, silt, and shale--Evaluation of water saturation, porosity, and grain-size distribution: Log Analyst, v. 11, no. 2, p. 3-22.



• Bhuyan, K., and Passey, Q.R., 1994, Clay estimation from GR and neutron-density porosity logs: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. DDD1-DDD15.



• Biella, G., Lozeij, A., and Tabacco, I., 1983, Experimental study of some hydrogeological properties of unconsolidated porous media: Ground Water, v. 21, no. 6, p. 741-751.



• Borst, R.L., 1982, Some effects of compaction and geological time on the pore parameters of argillaceous rocks: Sedimentology, v. 29, no. 2, p. 291-298.



• Brown, A.A., and Bowers, Brian, 1958, Porosity determinations from neutron logs: Petroleum Engineer, v. 30, no. 5, p. B30-B34.



• Brown, G.A., 1988, The formation porosity exponent - the key to improved estimates of water saturation in shaly sands: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. AA1-AA24.



• Burke, J.A., Campbell, R.L., Jr., and Schmidt, A.W., 1969, The litho-porosity cross plot--A new concept for determining porosity and lithology from logging methods [abs.]: Society of Professional Well Log Analysts Annual Logging Symposium, 10th, Houston, Tex., 1969, Transactions, p. Y1.



• Burnett, T.M., Koopersmith, C.A., and Spross, R.L., 1990, Drill collar effects on MWD epithermal, thermal and capture gamma ray neutron porosity measurements: Society of Professional Well Log Analysts Logging Symposium, 31st, Lafayette, La., 1990, Transactions, p. E1-E22.



• Butler, J., Kemshell, P.B., Locke, H.F., and Armishaw, M.J., 1992, PC2-A porosity code for personal computers: Society of Professional Well Log Analysts Annual Logging Symposium, 33rd, Oklahoma City, Okla., 1992, Transactions, p. Q1-Q20.



• Calvert, S., Lovell, M., Harvey, P., Samworth, J.R., and Hook, J., 1998, Porosity determination in horizontal wells, in Transactions of the SPWLA (Society of Professional Well Log Analysts) Thirty-Ninth Annual Logging Symposium, May 26-29, 1998: Houston, Tex., Society of Professional Well Log Analysts, Paper BBB, 14 p.



• Case, C.R., Flaum, C., Wraight, P.D., and DasGupta, T., 1995, Improved porosity estimation in invaded gas reservoirs using a pulsed neutron: Society of Professional Well Log Analysts Annual Logging Symposium, 36th, Paris, France, 1995, Transactions, p. X1-X9.



• Chang, Dahai, Vinegar, Harold, Morriss, Chris, and Straley, Chris, 1994, Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. A1-A21.



• Collier, H.A., 1988, The effect of isolated biomoldic porosity on the log analysis of a Pennsylvanian carbonate reservoir in north Texas: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. X1-X16.



• Cooke-Yarborough, P., 1987, A method for reconciliation of log-derived and core-derived porosity: Society of Professional Well Log Analysts Annual Logging Symposium, 28th, London, England, 1987, Transactions, p. DD1-DD20.



• Corona, W.W., and Mavko, Gary, 1999, Predicting clay content and porosity from gamma-ray and conductivity logs, in Powers, M.H., Cramer, Lynn, and Bell, R.S., comp. and eds., Proceedings of the Symposium on the Application of Geophysics to Engineering and Environmental Problems, March 14-18, 1999: Wheat Ridge, Colo., Environmental and Engineering Geophysical Society, p. 425-434.



• Czubek, J.A., 1990, Calibration of neutron porosity tools using semi-empirical approach: Society of Professional Well Log Analysts Logging Symposium, 31st, Lafayette, La., 1990, Transactions, p. QQ1-QQ18.



• Dahlberg, K.E., and Fitz, D.E., 1988, Comparing log-derived and core-derived porosity and mineralogy in thinly bedded reservoirs--an integrated approach: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. W1-W18.



• Dodge, W.S., Guzman-Garcia, A.G., Noble, D.A., LaVigne, Jack, and Akkurt, Ridvan, 1998, A case study demonstrating how NMR logging reduces completion uncertainties in low porosity, tight gas sand reservoirs, in Transactions of the SPWLA (Society of Professional Well Log Analysts) Thirty-Ninth Annual Logging Symposium, May 26-29, 1998: Houston, Tex., Society of Professional Well Log Analysts, Paper VV, 14 p.



• Dodge, Scott, Sr., Shafer, John, and Klimentidis, Robert, 1996, Capillary pressure--the key to producible porosity: Society of Professional Well Log Analysts Annual Logging Symposium, 37th, New Orleans, La., 1996, Transactions, p. J1-J13.



• Ellis, D.V., Flaum, C., Galford, J.E., and Scott, H.D., 1987, The effect of formation absorption on the thermal neutron porosity measurement: Society of Petroleum Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers Paper SPE 16814, p. 639-653.



• Erchul, R.A., 1972, The use of electrical resistivity to determine porosity of marine sediments [University of Rhode Island, Ph. D. dissertation]: University Microfilms, International, Publication no. 72-22372, 127 p.



• Evans, H.B., 1965, GRAPE--A device for continuous determination of material density and porosity: Society of Professional Well Log Analysts Annual Logging Symposium, 6th, Dallas, Tex., 1965, Transactions, p. B1-B25.



• Evans, M., Wraight, P., Marienbach, E., Rhein-Knudsen, E., and Best, David, 1988, Formation porosity measurement while drilling: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. C1-C18.



• Farquhar, R.A., Smart, B.G.D., and Crawford, B.R., 1993, Porosity-strength correlation--failure criteria from porosity logs: Society of Professional Well Log Analysts Annual Logging Symposium, 34th, Calgary, Alberta, Canada, 1993, Transactions, p. AA1-AA16.



• Fertl, W.H., 1978, Knowing basic reservoir parameters first step in log analysis: Oil and Gas Journal, v. 76, no. 21, p. 98-118.



• Fertl, W.H., and Wichmann, P.A., 1977, Open hole porosity logs can be used in cased holes: Oil and Gas Journal, v. 75, no. 14, p. 84-86.



• _____1977, Porosity can be determined in cased well bores: Petroleum Engineer, v. 49, no. 5, p. 13-137.



• Freedman, R., Boyd, A., Gubelin, G., McKeon, D., Morriss, C.E., and Flaum, C., 1997, Measurement of total NMR porosity adds new value to NMR logging, in Transactions of the SPWLA (Society of Professional Well Log Analysts) Thirty-Eighth Annual Logging Symposium, June 15-18, 1997: Houston, Tex., Society of Professional Well Log Analysts, Paper OO, 14 p.



• Freeman, Den, and Osoba, J.S., 1979, Porosity determined from neutron, density, and sonic logs in western tight gas sands: U.S. Department of Energy Annual Symposium on Enhanced Oil and Gas Recovery, and Improved Drilling Techniques, 5th, Tulsa, Okla., 1979, Proceedings, v. 1, p. L2/1-L2/9.



• Gardner, R.P., Ao, Q., Xie, Y., Guo, P., Prettyman, T.H., and Verghese, K., 1992, Iterative convolution augmented with Monte Carlo simulation--preliminary formation layer results for neutron porosity and natural gamma-ray logs: Society of Professional Well Log Analysts Annual Logging Symposium, 33rd, Oklahoma City, Okla., 1992, Transactions, p. R1-R25.



• Glanville, C.R., 1970, Log interpretations of gas sands from multiple-porosity and resistivity logging programs: Log Analyst, v. 11, no. 4, p. 3-11.



• Goldberg, I., and Gurevich, B., 1998, Porosity estimation from P and S sonic log data using a semi-empirical velocity-porosity-clay model, in Transactions of the SPWLA (Society of Professional Well Log Analysts) Thirty-Ninth Annual Logging Symposium, May 26-29, 1998: Houston, Tex., Society of Professional Well Log Analysts, Paper QQ, 10 p.



• Haneberg, W.C., 1995, Depth-porosity relationships and virgin specific storage estimates for the upper Santa Fe Group aquifer system, central Albuquerque Basin, New Mexico: New Mexico Geology, v. 17, no. 4, p. 62-71.



• Harms, J.C., and Choquette, P.W., 1965, Geologic evaluation of a gamma-ray porosity device: Society of Professional Well Log Analysts Annual Logging Symposium, 6th, Dallas, Tex., 1965, Transactions, p. C1-C37.



• Herrick, D.C., and Kennedy, W.D., 1996, Electrical properties of rocks--effects of secondary porosity, laminations and thin beds: Society of Professional Well Log Analysts Annual Logging Symposium, 37th, New Orleans, La., 1996, Transactions, p. C1-C11.



• _____1995, Formation resistivity factor and permeability relationships in rocks characterization by secondary solution porosity: Society of Professional Well Log Analysts Annual Logging Symposium, 36th, Paris, France, 1995, Transactions, p. QQQ1-QQQ12.



• Holbrook, Phil, 1995, The relationship between porosity, mineralogy and effective stress in granular sedimentary rocks: Society of Professional Well Log Analysts Annual Logging Symposium, 36th, Paris, France, 1995, Transactions, p. AA1-AA12.



• Holenka, J., Best, D., Evans, M., Kurkoski, P., and Sloan, W., 1995, Azimuthal porosity while drilling: Society of Professional Well Log Analysts Annual Logging Symposium, 36th, Paris, France, 1995, Transactions, p. BB1-BB12.



• Hook, J., Basan, P., and Lowden, B., 1996, The MRIL log in a low porosity and permeability formation: Society of Professional Well Log Analysts Annual Logging Symposium, 37th, New Orleans, La., 1996, Transactions, p. N1-N13.



• Hoyer, Darrell, 1991, Evaluation of coalbed fracture porosity from dual laterolog: Society of Professional Well Log Analysts Logging Symposium, 32nd, Midland, Tex., 1991, Transactions, p. U1-U15.



• Husten, P.F., and Anton, Heimo, 1981, The porosity surface concept: Erdoel- Erdgas Zeitschrift, v. 97, no. 6, p. 218-220.



• Jenkins, R.E., 1966, Accuracy of porosity determinations: Log Analyst, v. 7, no. 2, p. 29-34.



• Kamel, M.H., El-Difrawy, M., Bayoumi, A., and Hosney, H., 1991, Porosity-mechanical properties crossplots--possible indicators of fracture intensity: Society of Professional Well Log Analysts Logging Symposium, 32nd, Midland, Tex., 1991, Transactions, p. N1-N21.



• Khanin, A.A., and Burova, E.G., 1964, Rock permeability as a function of pore space structure: Razvedka i Okhrana Nedr, v. 30, no. 12, p. 22-27; and Glen Ridge, N. J., Associated Technical Services, Inc., p. 1-6.



• Lang, W.H., Jr., 1973, Porosity-resistivity cross-plotting: Log Analyst, v. 14, no. 1, p. 16-20.



• Locke, S., Dudek, J., Barnett, C., and Hubner, B., 1991, Theory, response, and calibration of an MWD neutron porosity sensor employing sidewall-mounted Li6 glass scintillation neutron detectors and spectral processing: Society of Professional Well Log Analysts Logging Symposium, 32nd, Midland, Tex., 1991, Transactions, p. F1-F23.



• Lucia, F.J., 1981, Petrophysical parameters estimated from visual descriptions of carbonate rocks--A field classification of carbonate pore space: Society of Petroleum Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers Paper SPE 10073, 9 p.



• Marion, D., Nur, A., and Alabert, F., 1989, Modeling the relationships between sonic velocity, porosity, permeability, and shaliness in sand, shale, and shaley sand: Society of Professional Well Log Analysts Logging Symposium, 30th, Denver, Colo., 1989, Transactions, p. G1-G22.



• Maubeuge, Frederic, Didek, M.P., Beardsell, M.B., Arquis, Eric, and Caltagirone, J.P., 1994, Temperature model for flow in porous media and wellbore: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. N1-N16.



• Menger, Stefan, and Prammer, Manfred, 1998, Can NMR porosity replace conventional porosity in formation evaluation?, in Transactions of the SPWLA (Society of Professional Well Log Analysts) Thirty-Ninth Annual Logging Symposium, May 26-29, 1998: Houston, Tex., Society of Professional Well Log Analysts, Paper RR, 9 p.



• Mercier, V.J., and Redford, W.H., 1957, New calibration and conversion techniques for radioactivity logs: Journal of Petroleum Technology, v. 9, no. 9, p. 11-15.



• Mickael, M., Gardner, R.P., and Verghese, K., 1988, McDNL--a new specific purpose Monte Carlo code for simulation of dual-spaced neutron porosity logs: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. MM1-MM17.



• Mickael, M.W., Prati, E.J., Gilchrist, Jr., W.A., Koudelka, J.C., and Oliver, D.W., 1994, A new compensated thermal neutron tool for porosity measurement: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. I1-I24.



• Mikaelyan, S.S., 1959, The formation factor as a function of the porosity: Geologiya Nefti i Gaza, v. 3, no. 7, p. 39-44; and Glen Ridge, N.J., Associated Technical Services, Inc., p. 1-7.



• Mills, W.R., Stromswold, D.C., and Allen, L.S., 1988, Pulsed neutron porosity logging: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. KK1-KK21.



• Moake, G.L., 1989, Modeling of a dual-detector epithermal neutron porosity tool: Society of Professional Well Log Analysts Logging Symposium, 30th, Denver, Colo., 1989, Transactions, p. RR1-RR24.



• Morris, R.L., and Biggs, W.P., 1967, Using log-derived values of water saturation and porosity: Society of Professional Well Log Analysts Annual Logging Symposium, 8th, Denver, Colo., 1967, Transactions, p. X1-X26.



• Moss, R.M., and Russo, J.W., 1991, Quantitative determination of secondary porosity using X-ray computed tomography and wireline logs: Society of Professional Well Log Analysts Logging Symposium, 32nd, Midland, Tex., 1991, Transactions, p. J1-J25.



• Nelson, P.H., 1996, Computation of porosity and water content from geophysical logs, Yucca Mountain, Nevada: U.S. Geological Survey Open-File Report 96-078, 64 p.



• Oraby, M.E.T., 1992, N3LIP--lithology independent porosity calculations using three neutron measurements: Society of Professional Well Log Analysts Annual Logging Symposium, 33rd, Oklahoma City, Okla., 1992, Transactions, p. O1-O19.



• Osoba, Joe, and Gist, Rhett, and Raible, Clarence, 1982, Density, sonic, and neutron log porosity calculation in the Uinta Basin, Utah: Department of Energy, Bartlesville Energy Technology Center, Western Tight Gas Sands Advanced Logging Workshop, Tulsa, Okla., Proceedings, p. 150-174.



• Patchett, J.G., and Coalson, E.B., 1979, The determination of porosity in sandstones and shaly sandstones, pt 1-- Quality control: Log Analyst, v. 20, no. 6, p. 3-12.



• Porras J.C., 1998, Determination of rock types from pore throat radius and bulk volume water, and their relations to lithofacies, Carito Norte Field, eastern Venezuela Basin, in Transactions of the SPWLA (Society of Professional Well Log Analysts) Thirty-Ninth Annual Logging Symposium, May 26-29, 1998: Houston, Tex., Society of Professional Well Log Analysts, Paper OO, 13 p.



• Porter, C.R., and Carothers, J.E., 1970, Formation factor-porosity relation derived from well log data: Society of Professional Well Log Analysts Annual Logging Symposium, 11th, Los Angeles, Calif., 1970, Transactions, p. A1-A18.



• Quarles, C.A., Hsueh, Chin-yu, Urban, J.M., and Salaita, G.N., 1994, Application of positron annihilation spectroscopy to the study of lithology and porosity of well-characterized rocks--doppler broadening of annihilation radiation and lifetime measurements: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. X1-X22.



• Ramamoorthy, Raghu, Murphy, W.F., and Coll, Carolina, 1995, Total porosity estimation in shaly sands from shear modulus: Society of Professional Well Log Analysts Annual Logging Symposium, 36th, Paris, France, 1995, Transactions, p. H1-H12.



• Ransom, R.C., 1977, Methods based on density and neutron well-logging responses to distinguish characteristics of shaly sandstone reservoir rock: Log Analyst, v. 18, no. 3, p. 47-62.



• Raymer, L.L., and Biggs, W.P., 1963, Matrix characteristics defined by porosity computations: Society of Professional Well Log Analysts Annual Logging Symposium, 4th, Oklahoma City, Okla., 1963, Transactions, p. X1-X21.



• Russell, J.H., and Bishop, B.O., 1954, Quantitative evaluation of rock porosities by neutron-neutron method: Petroleum Engineer, v. 26, no. 4, p. B76, B78-80, B82, B84, B86.



• Savre, W.C., 1963, Determination of a more accurate porosity and mineral composition in complex lithologies with the use of the sonic, neutron and density surveys: Journal of Petroleum Technology, September, p. 945-959.



• Savre, W.C., and Burke, J.A., 1963, Determination of true porosity and mineral composition in complex lithologies with the use of sonic, neutron, and density surveys: Society of Professional Well Log Analysts Annual Logging Symposium, 4th, Oklahoma City, Okla., 1963, Transactions, p. XI1-XI35.



• Scott, H.D., Wraight, P.D., Thornton, J.L., Olesen, J-R., Hertzog, R.C., McKeon, D.C., DasGupta, T., and Albertin, I.J., 1994, Response of a multidetector pulsed neutron porosity tool: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. J1-J25.



• Sherman, Harold, and Locke, Stanley, 1975, Effect of porosity on depth investigation of neutron and density sondes: Society of Petroleum Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers Paper SPE 5510, 12 p.



• Silva, A.J., and Morin, R.H., 1986, The sensitivity of sediment physical properties to changes in temperature, pressure, and porosity, in Burrus, J., ed., Thermal Modeling in Sedimentary Basins--Proceedings of the 1st IFP Exploration Research Conference, June 3-7, 1985: Paris, France, Institut Francais du Petrole, p. 289-309.



• Smeulders, David, 1994, Shock tube experiments on saturated and partially saturated porous rocks: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. V1-V18.



• Smith, J., Fishburn, T., and Bigelow, E., 1996, Acoustic porosity corrections for gas and light hydrocarbon-bearing sandstones: Society of Professional Well Log Analysts Annual Logging Symposium, 37th, New Orleans, La., 1996, Transactions, p. AAA1-AAA9.



• Smith, M.P., 1986, Calibration, checking and physical corrections for a new dual-spaced neutron tool: Society of Professional Well Log Analysts Annual Logging Symposium, 27th, Dallas, Tex., 1986, Transactions, p. YY1-YY24.



• Stetyukha, E.I., Pivovarov, V.T., and Lyshko, N.A., 1961, Relation between density, unit weight, and porosity of rocks: Izvestiya Vysshikh Uchebnykh Zavedenij, Neft' i Gaz, v. 4, no. 11, 23-27: Glen Ridge, N.J., Associated Technical Services, Inc., p. 1-6.



• Tittle, C.W., 1988, Predicting the porosity response of the CNL from neutron parameters of the formation: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. LL1-LL10.



• _____1990, Porosity--An improved porosity code for the CNL for desk-top computers: Nuclear Geophysics, v. 4, no. 2, p. 193-203.



• _____1992, Diffusion theory models of invasion for nuclear porosity tools: Society of Professional Well Log Analysts Annual Logging Symposium, 33rd, Oklahoma City, Okla., 1992, Transactions, p. N1-N12.



• Tittman, Jay, 1955, Moderation of neutrons in SiO and CaCO : Journal of Applied Physics, v. 26, no. 4, p. 394-398.



• Tixier, M.P., 1958, Porosity balance verifies water saturation determined from logs: Journal of Petroleum Technology, v. 10, no. 7, p. 161-169.



• Towle, Guy, 1962, an analysis of the formation resistivity factor-porosity relationship of some assumed pore geometries: Society of Professional Well Log Analysts Annual Logging Symposium, 3d, Houston, Tex., 1962, Transactions, 29 p.



• Traugott, M.O., 1970, Log evaluation of a heterogeneous carbonate reservoir, Cato San Andres field: Society of Professional Well Log Analysts Annual Logging Symposium, 11th, Los Angeles, Calif., 1970, Transactions, p. E1-E8.



• Truman, R.B., Howard, W.E., and Luffel, D.L., 1989, Shale porosity - its impact on well log modeling and interpretation: Society of Professional Well Log Analysts Logging Symposium, 30th, Denver, Colo., 1989, Transactions, p. Q1-Q15.



• Vernik, Lev, 1997, Acoustic velocity and porosity systematics in siliciclastics, in Transactions of the SPWLA (Society of Professional Well Log Analysts) Thirty-Eighth Annual Logging Symposium, June 15-18, 1997: Houston, Tex., Society of Professional Well Log Analysts, Paper Y, 14 p.



• Visser, R., Bours, K.A.T., and van Baaren, J.P., 1988, Effective porosity estimation in the presence of dispersed clay: Society of Professional Well Log Analysts Logging Symposium, 29th, San Antonio, Tex., 1988, Transactions, p. BB1-BB13.



• Wagner, P.D., and Matthews, R.K., 1982, Porosity preservation in the upper Smackover (Jurassic) carbonate grainstone, walker Creek Field, Arkansas--Response of paleophreatic lenses to burial processes: Journal of Sedimentary Petrology, v. 52, no. 1, p. 3-18.



• Watfa, M., and Nurmi, R., 1987, Calculation of saturation, secondary porosity and producibility in complex Middle East carbonate reservoirs: Society of Professional Well Log Analysts Annual Logging Symposium, 28th, London, England, 1987, Transactions, p. CC1-CC24.



• Wempe, Wendy, and Mavko, Gary, 2000, The electrical resistivity-acoustic velocity relationship--a method for constraining porosity, in Powers, M.H., Ibrahim, Abou-Bakr, and Cramer, Lynn, comp. and eds., Proceedings of the Symposium on the Application of Geophysics to Engineering and Environmental Problems, Feb. 20-24, 2000: Wheat Ridge, Colo., Environmental and Engineering Geophysical Society, p. 633-642.



• Wiley, R., and Patchett, J.G., 1989, CNL neutron porosity modeling, a step forward: Society of Professional Well Log Analysts Logging Symposium, 30th, Denver, Colo., 1989, Transactions, p. OO1-OO22.



• _____1994, The effects of invasion on density/thermal neutron porosity interpretation: Society of Professional Well Log Analysts Annual Logging Symposium, 35th, Tulsa, Okla., 1994, Transactions, p. G1-G24.



• Wilson, R.D., Stromswold, D.C., Mills, W.R., and Cook, T.K., 1989, Porosity logging using epithermal neutron lifetime--Monte Carlo simulations: Nuclear Geophysics, v. 3, no. 4, p. 323-334.



• Wraight, P., Evans, M., Marienbach, E., Rhein-Knudsen, E., and Best, D., 1989, Combination formation density and neutron porosity measurements while drilling: Society of Professional Well Log Analysts Logging Symposium, 30th, Denver, Colo., 1989, Transactions, p. B1-B23.



• Zoeller, W.A., 1966, Dual porosity logging--A means to better evaluation of porosity and lithology in the Permian Basin: Log Analyst, v. 6, no. 5, p. 50-59.