Structural and Stratigraphic Mapping of Emi Field, Offshore Niger Delta
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Academic Journals
Abstract
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The Niger Delta, where oil and gas are predominantly trapped in sandstones and unconsolidated sands
in the Agbada formation, ranked among the world’s major hydrocarbon provinces. The traps, structure
and stratigraphic, could be very subtle and complex and are therefore, difficult to map accurately. The
degree of reliability and precision of the mapping can be greatly enhanced by integrating seismic data
with well logs commonly used independently in hydrocarbon exploration and exploitation studies. In
this paper, seismic data were integrated with well logs to define the subsurface geometry, stratigraphy
and hydrocarbon trapping potential of Emi-field, off shore Niger Delta. Lithologic units were identified
on the logs and correlated across the wells. The stratigraphic cross-sections produced show a general
lateral continuity of the lithologic units across the field. Seismic-to-well ties revealed that, high
amplitude reflection events correspond to sand units, whereas, low amplitude reflection events
correspond to shale units. Four horizons, H1, H2, H3 and H4 were mapped and structure contour maps
produced for each of the horizons. Closures considered as good hydrocarbon prospects were identified
and delineated. Stratigraphic plays such as pinch-outs, unconformities, sand lenses and channels are
also suspected. The integration of seismic data with well logs proved to be a useful tool in structural
and stratigraphic mapping and in predicting lateral and vertical variations in the lithologic units.
Keywords
QC Physics, QE Geology