Depositional Environment and Petrophysical Characteristics of “LEPA” Reservoir, Amma Field, Eastern Niger Delta, Nigeria

摘要

The LEPA reservoirs penetrated by five wells drilled in Amaa field, Niger Delta, were investigated for its depositional environments and petrophysical characteristics. The porosity ranges from very good to excellent and the permeability vary from good to excellent. Assessment of the depositional environments is based on the integration of well logs and core data. Lithofacies analysis is grouped into facies association comprising tidal channels, Upper shoreface, and Lower shoreface. A mixture of marine reworked sands and subordinate fluvial sands, marked by erosion base characterises the tidal channel. The Upper shoreface facies consist of coarsening upward sequence, sandstone succession of fine to very fine sand facies associations and these were caliberated with selected logs to allow the field correlation. The result available from integration of wireline log and core data reveal that the environment of deposition of LEPA reservoir sands lies within the marginal marine environments.