Integration of Sequence Stratigraphy and Petrophysical Analysis for Reservoir Characterization: A Case Study of “KO” Field, Central Niger Delta

Abstract

Reservoir characterization is one of the most relevant steps taken in exploration and development stages of any prospective reservoir. Results obtained from various analyses are integrated with it to prevent/minimize the risk of doubtfulness. In this study, integration of sequence stratigraphy and petrophysical analysis for reservoir characterization: a case study of “KO” field Central Niger Delta. The evaluation was achieved using well logs. The data used comprises of three wells with relevant well log suites for the targets for further exploration. The petrophysical parameters calculated include porosity, permeability, shale volume, etc. using Schlumberger PETREL, Microsoft Excel, and Python programming language softwares. However, the stratigraphic studies aid the understanding of the reservoir sand distribution in the subsurface for modelling of the depositional settings. There is usually a gradual change in the depositional sequence  determination and well log parameters study, there would be better understanding of the depositional system for better reservoir sand distribution prediction. The methodology encompasses the reconstruction of geologic lithofacies information from geophysical logs. The results obtained from this study shows
that the integration of well logs and depositional sequence aid in the delineation of hydrocarbon bearing zones and prediction of sand distribution. All the sand intervals possess high porosity and permeability values and high volume of hydrocarbon in place. It is also seen that the rock properties in the reservoir units are influenced primarily by the depositional processes.