Paleoenviromental and Sequence Stratigraphic Studies of the D7.000 Sand, 'Eme' Field, Niger Delta, Nigeria

This research work focuses attention on the geological properties of a hydrocarbon bearing in ‘Eme’ field of the Niger Delta. The environment of deposition is examined and the type produced as a model of the sub-surface reservoir. To achieve this, an integrated analysis of cores from wells, as well as biostratigraphic data and wireline logs of the D7.000 sand were used for the study. The D7.000 sand of study comprises one major depositional sequence. It is made up of upper and lower stratigraphic para-sequence sets. The upper depositional setting is interpreted as transgressive sand deposits in an estuarine environment. However, the lower depositional setting is interpreted as progradational deposits. Hence, the depositional model interpreted for the reservoir sand is prograding marine shoreface followed by a transgressive estuarine setting. This shows that a period of regression was followed by a transgressive phase which led to the deposition of the estuarine complexes. From the petrophysical study carried out through use of composite logs, amalgamated sand is found to be more porous and more permeable than the tidal channel. Core analysis revealed the existence of ten lithofacies. These lithofacies are grouped into facies association in a vertical sequence with a genetic significance using primary structures and shape of wireline logs