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Archive | ISSUE: , Volume: Oct-Dec-2023

Investigation of Hydrocarbon Accumulation in Pearl Field, Niger Delta Offshore: Using 3D Seismic and Well Log Interpretation


Author:Alade, M., A., Onyebueke, E.O., Adejumo, P.P

published date:2023-Oct-05

FULL TEXT in - | page 189 - 203

Abstract

Geophysical data are vital for understanding the geological structures within an area for hydrocarbon trapping potential. Well-log suites and 3D seismic data were employed to assess the subsurface structure of Pearl Field Offshore, Niger Delta Basin. The 3D seismic and well-logs were examined to map structures responsible for hydrocarbon accumulation. This involves fault interpretation and horizon interpretation. This study revealed that the field was controlled by the growth faults and rollover anticlines structures. Twelve (12) faults were identified and mapped on seismic sections across the entire field, where two (2) are major growth faults (F2 and F3), four (4) are synthetics faults (F4, F5, F6 and F7), and five are antithetic faults (F8, F9, F10, F11 and F12). Fault F2 (yellow colour) cuts through the entire mapped area. Fault F3 (green colour) trends southwest to the middle of the seismic survey. Hence, Faults F2 and F3 are predominantly the active major structure building faults (MSBF). The synthetics and antithetic were interpreted as minor faults. Reservoir sands were delineated from the well-logs using gamma-ray for the lithology identification and resistivity-logs for the fluid identification. Horizons were mapped across the seismic section. Hence, the result shows that the presence of faults is an indication that there is potential element that is responsible for hydrocarbon accumulation in the Pearl Field. The major faults block E and F were interpreted as the major structure building faults (MSBF) responsible for major structural trap at the western part of the survey. This also revealed that growth faults and rollover anticlines are the highly faulted structural elements responsible for hydrocarbon accumulation. These closures are displayed to detect potential hydrocarbon traps on the down-thrown side of fault blocks E and F.

Keywords: Structural interpretation, Seismic, Well logs, Faults, hydrocarbon accumulation

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