Geological straitigraphy and spatial distribution

Wavelet Transform (WT) is an efficacious and powerful mathematical tool for time and frequency localization. It has numerous advantages over Fourier Transform (FT) to obtain frequency information of a signal. Initially Continuous Wavelet Transform (CWT) is applied on gamma ray logs of two different Well sites (Well-1039 & Well-1043) of Costa Rica Convergent Margin, Central America for identifications of lithofacies and fracture zones and later Discrete Wavelet Transform (DWT) applied to DPHI log signals to show its efficiency in discriminating small changes along the rock matrix irrespective of the instantaneous magnitude to represent the fracture contribution from the total porosity recorded. Later the data of the appropriate depths partitioned using above mathematical tools are utilized separately for WBFA. It is found that there are four major sedimentary layers terminated with a concordant igneous intrusion passing through both the wells, in which first sedimentary layers and the last gabbroic sill intrusions show consistent values of fractal dimensions. Intermediate lithofacies show slight variations in fractal dimension values which is attributed to the presence of fractures and verified through core analysis. Fractal Dimension values suggest that the sedimentary environments persisting in that well locations bears abundant shale content and of low energy environments.