COMPREHENSIVE ANALYSIS OF RESERVOIR CHARACTERISTICS AND PETROPHYSICAL PARAMETERS IN THE M WELL, NIGER DELTA BASIN

ABSTRACT

This study presents a comprehensive analysis of the M Well reservoirs in the Niger Delta Basin, focusing on reservoir quality, porosity-permeability relationships, and depositional environment. Through a meticulous integration of well log responses and core data, we have delineated several key findings. The quality of the M Well reservoirs is primarily governed by grain size, with well-sorted, medium to coarsegrained sands exhibiting excellent reservoir attributes, characterized by high porosity and permeability. A strong positive correlation between porosity and permeability underscores the interconnectedness of pore spaces within these sands. Heterogeneity within the formation accounts for discrepancies between core and log porosity values, highlighting the localized nature of core measurements compared to the continuous and averaged nature of log data. Low water saturation levels in the reservoirs suggest significant hydrocarbon potential, with average hydrocarbon saturation values indicating favorable conditions for production. Our interpretation indicates that the M Well reservoirs were deposited in a tidally influenced progradational shoreline environment, featuring alternating layers of sand and clay, with predominantly wellsorted sands toward the upper strata. To ensure measurable permeability and facilitate efficient hydrocarbon production, a minimum porosity threshold of 20% to 36% (from Petrophysical logs) or 25% to 40% (from core analysis) is considered essential in these reservoirs. In conclusion, this study advocates for a holistic approach to reservoir characterization, integrating electrical log responses, core data, and other techniques to inform decision-making for economic hydrocarbon production in the M Well. The results provide valuable insights for reservoir management and production optimization within the Niger Delta Basin.