document

Paper Number	2003-L
Title	WESTERN ANALYSIS OF RUSSIAN LOG DATA
Authors	George M. Carlstrom, Robert M. Cluff, The Discovery Group Inc.
Source	SPWLA 44th Annual Logging Symposium, 2003
Copyright	2003. Society of Petrophysicists & Well Log Analysts
Language	English
Preview	ABSTRACT Since the early 1990''s, Western companies and Western specialists working for joint ventures in Russia have been faced with the daunting task of evaluating properties using Russian log data. The typical Russian log suite is rich in electrical measurements but lean in the radioactive and acoustic measurements that western specialists are accustomed to. Also, the logs are laid out in a format that is convenient for the Russian log analyst, not for the geologist. Kogalym is a field in the Kogalym producing region of the prolific Western Siberian Basin. The field became part of a joint venture in 1995 and since then has had a strong Western influence on production operations and the continuing development drilling. The history of this field has resulted in an excellent data set for comparing modern Western logs with older vintage Russian log suites and more modern Russian log suites. Core data is relatively abundant and many wells were logged with both Russian and Western equipment. Two studies have been conducted in portions of Kogalym where there is a mix of Russian and Western logging data. In both of these studies it was necessary to provide a seamless evaluation. It was found that with readily available software and with wells that have both log suites, the Russian data can be converted into a Western format. From that point on, the data can be evaluated using standard Western techniques. The key is the ability to replicate a Western compensated neutron log from either the single detector or two-detector Russian cased-hole neutron logs. From the neutron log and the SP, a neural net can replicate a compensated density log. Rt can be obtained from either the BKZ (Russian lateral logs) suite or the induction log. With this data set, standard western techniques can be applied to obtain reservoir parameters. For seismic analysis, a compensated compressional acoustic curve can be replicated from the neutron log by use of either deterministic methods or a neural net. The shear acoustic curve can be replicated with a neural net, using the compressional acoustic and synthetic density curve. Poisson''s ratio and acoustic impedance can be calculated from these synthetic curves or developed directly from a neural net. In this project, it was found that the Poisson''s ratio and acoustic impedance derived from a neural net avoided the problem of compounding errors and were superior to the values calculated from the synthetic curves. The conclusion from these studies is that with the presence of Western data for comparison and normalization and the use of neural net software, a basic Russian log suite can be converted to a complete Western log suite that can be evaluated using standard Western techniques. L
Number of Pages	13
File Size	1185 KB
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