Abstract
A three-dimensional seismic reflection survey carried out in Odo Field in the central swamp of the Niger Delta Basin has been interpreted with respect to exploration for hydrocarbons. The Odo Field is marked by a large southwest heading listric growth fault with numerous synthetic and antithetic faults. The two picked seismic events, horizons 1 and 2 indicate four closures each, which are hydrocarbon bearing. The faults in the field thus support hydrocarbon accumulations which are seen to be mainly fault/dip closures. The expectations calculated for the observed fault closures suggest that several in-field appraisal prospects exist. The seismic attributes (amplitude maps) furthermore suggest that horizon 1 is mainly gas bearing. Key words: Field, faults, Niger Delta, seismic, hydrocarbon
Highlights
Hydrocarbons such as oil and gas are found in geologic traps, which can either be structural or stratigraphic (Doust and Omatsola, 1990)
Faults were interpreted as structures on every eight in line while the seismic events were interpreted on every eight in-lines and sixteenth cross-lines thereby generating an 8 × 16 grid
The field is marked by a large southwest heading listric growth fault with numerous but closely spaced northwest to southeast antithetic and synthetic faults which are seen to be discontinuous across the field forming semi-parallel fault blocks (Figure 5)
Summary
Hydrocarbons such as oil and gas are found in geologic traps, which can either be structural or stratigraphic (Doust and Omatsola, 1990). Hydrocarbon exploration aims at identifying and delineating these structural and stratigraphic traps suitable for economically exploitable accumulations in a field. It helps in delineating the extent of discoveries in field appraisals and development. These traps could be very multifaceted and subtle, mapping it accurately becomes difficult. The geophysicist works with a set of seismic sections and the primary product of the geophysical interpretation is a series of annotated maps indicating presence of prospective highs or other potential trap structures (McQuillin et al, 1984).
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