Characterizing complex fluvial-deltaic deposits is a challenging task for finding hydrocarbon discoveries. We described a methodology for predicting the hydrocarbon zones from complex well-log and prestack seismic data. In this current study, data analysis involves an integrated framework based on Simultaneous prestack seismic inversion (SPSI), target correlation coefficient analysis (TCCA), Poisson impedance inversion, and non-parametric statistical analysis, and Bayesian classification. First, seismic elastic attributes from prestack seismic data were estimated. They can provide the spatial distribution of petrophysical properties of seismic data. Then target correlation coefficient analysis (TCCA) was estimated roration factor “c” from well-log data. Using the seismic elastic attributes and rotation factor “c”, Poisson impedance inversion was performed to predict the Poisson impedance volume. Finally, Bayesian classification integrated the Poisson impedance volume with non-parametric probabilistic density functions (PDFs) to estimate the spatial distribution of lithofacies. Despite complex characteristics in the elastic properties, the current study successfully delineated the complex fluvial-details deposits. These results were verified with conventional findings through numerical analysis.
Generally, subsurface water seepages are caused by underground utilities, and nearby large water bodies are a major problem in the industries. These underground leakages cause severe damage to the foundation/basement of the building and facilities and the underground pipelines. In this study, we have identified the subsurface seepage source locations in one of the oil and gas facilities in India. We have proceeded with an integrated approach by combing Ground Penetrating Radar (GPR) survey and Non-Destructive Testing (NDT) methods. We have used 100 MHz and 400 MHz GPR antennas to scan the underground utilities and find the saturation of the subsurface layers by finding their resistivity. Long Range Ultrasonic Test (LRUT) and Phased Array Ultrasonic Testing (PAUT) are performed on the various diameter underground pipelines. The combined analysis and in-depth investigation of the results/outputs from GPR survey and NDT have successfully identified the reasons for the underground seepage points. These studies will help the industries save time and money to investigate the variability in the subsurface moisture distribution, find out the water channels, prevent damage to structures, and recommend suitable solutions to avert the damage to future installations.
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