Comprehensive Use of Electrical Inverse Lateral and Radioactive Logging for Strata Properties Investigation in Cased Wells
Abstract
This paper discusses the technology of combined use of electrical inverse lateral logging (EILL) and radioactive logging methods in cased wells for studying the physical properties of reservoirs, evaluating collector saturation, and improving the accuracy of geophysical interpretation. The application of these technologies to wells in the Shymoliy Berdak, Inam, and Tillali fields in the Ustyurt oil and gas region is outlined. Using examples of complex sections with hard-to-recover hydrocarbon reserves, it is demonstrated that traditional geophysical methods, such as neutron-neutron logging, are insufficient for accurately assessing geological and geophysical characteristics. To address this, a comprehensive approach combining EILL with neutron-neutron logging (2NNL), spectral gamma logging (SGL), and neutron gamma logging (NGL) methods was used. These methods provided precise data on collector and non-collector properties, as well as gas and water saturation of productive layers at significant distances from the wellbore. EILL technology minimizes errors associated with traditional methods and delivers reliable data for diagnosing hydrocarbon reservoir conditions. Data interpretation, carried out using standard techniques, enabled detailed analysis and recommendations for further well operation. The integrated technology significantly improved geophysical interpretation quality, facilitating effective well development and achieving industrial gas inflow.