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• W2074573818 abstract "Summary Currently accepted methods of normalizing cased hole neutron logs to porosity were determined to be unusable under conditions encountered during a reservoir study of the Texaco Bob Slaughter Block and nearby leases in Slaughter field, Cochran and Hockley counties, Texas. A new method for normalizing a large number of neutron logs was developed which is applicable in a wide range of situations. The method employs statistical parameters derived from available core and modern log suites to dependably transform the neutron log response. Unlike earlier techniques, a linear transform equation is developed for each log being normalized. The method calculates the slope of the transform equation comparing the standard deviation of the neutron values to a reference log with similar characteristics over a specified depth interval. The intercept of the transform line is then calculated from average porosity values for a specific interval not necessarily the same interval used to calculate the standard deviation. The technique eliminates inaccuracies in the normalization process created by tool differences, scale factors, and hole size. The effect of changes in lithology and formation fluid on the resulting porosity values are also minimized. Introduction In many instances, field development has taken place over decades. This period will span many different field practices and logging technologies and, usually, many different vendors. The reservoir engineer is faced with the dilemma of using outdated technology neutron logs and logging practices that didn't take BOR into account, or not use the older data at all. This paper presents a technique that uses more of the available information contained in cased hole neutron logs than has been used in the past. This technique uses modern open hole porosity logs and any available core analyses to establish a solid base of porosity values. Some information from compensated neutron logs is then used to finally normalize all the cased hole logs in the field. These can be logs reported in neutron counts, API units or porosity units. For each normalized log unique transform equation parameters are computed. This is a computation intense technique that also requires interaction from the user. The benefit is being able to use to more of your log information. Background Texaco conducted a detailed study of the San Andres dolomite reservoir in the Slaughter Field as a preparatory step for a large EOR project involving a carbon dioxide flood (Figure 1)." @default.
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• W2074573818 date "1996-03-01" @default.
• W2074573818 modified "2023-09-25" @default.
• W2074573818 title "Normalization of Cased-Hole Neutron Logs, Slaughter Field, Cochran and Hockley Counties, Texas" @default.
• W2074573818 doi "https://doi.org/10.2118/27648-pa" @default.
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