Seismic Attribute Analysis for Prospect Delineation in ‘TMB’ Field, Niger Delta Basin, Nigeria

Abstract

The ‘TMB’ Field was evaluated to detect hydrocarbon prospects for the purpose of increasing production volume using seismic attribute analyses. A total of eight sand tops were correlated across the Wells and faults orientation with significant displacement were picked across the field. Three horizons (Res. E, Res. H and Res. J) were used to generate the time maps which were converted to depths by a polynomial function from Time-Depth relationship. Two of the faults are major syn-tectonic growth faults that divides the field into three Fault Blocks (FB1, FB2 and FB3). Seismic attributes (Average Energy, Root Mean Square (RMS), Sweetness and Relative Acoustic Impedance (RAI)) amplitudes were examined to identify hydrocarbon prospect in the reservoirs. An area of interest (prospect) in one of the Fault Blocks (FB3) revealed attribute amplitude responses that suggest the presence of hydrocarbon was identified. The extracted attribute from Average energy, RMS and Sweetness attributes showed high amplitudes similar to attributes obtained from areas around Well log locations (proven area). Normal curves from attribute’s histogram distributions support hydrocarbon presence in FB3. The observed prospects are vertically stacked with fault-dependent anticlinal closures that serves as trap within the FB3 fault block.