Structural Styles and Hydrocarbon Trapping Mechanisms Onshore and Offshore, Niger Delta
DOI:
https://doi.org/10.57233/ijsgs.v10i1.601Keywords:
Hydrocarbon saturation, Offshore, Onshore, Structural Styles, Trapping.Abstract
A three-dimensional (3D) seismic Data and well log Data from two oil fields (Onshore Field and Offshore Field) were obtained and analyzed with Techlog and Petrotech software in order to attempt the structural styles and Hydrocarbon trapping mechanisms onshore and offshore fields. Suites of Well logs of the two fields were interpreted and appropriate reservoir bodies were characterized. The well log petrophysical analysis revealed three reservoirs in onshore and three reservoir in offshore which cut across four (4) wells respectively. Average reservoir parameters for the onshore such as porosity 30.01% and hydrocarbon saturation 64.33% with average thickness of 26.52m while the offshore average reservoir parameters such as porosity 28% and hydrocarbon saturation 77.67% with average thickness of 10m were derived from petrophysical analysis. A total of three horizons and seven faults were mapped on the onshore seismic sections that indicated faulted anticlines, listric fault, growth fault, synthetic and antithetic fault were closely observed. While three horizons were mapped on the offshore seismic section that indicates back-to-back structures. The structural maps showed that the major structures accommodating the Hydrocarbon in both fields are fault assisted closure, four way closures and growth faults. The trapping mechanisms were identified to be fault dependent. The root-mean-square (RMS) amplitude surface maps reveal sections with bright spot anomalies. The amplitude anomalies served as direct hydrocarbon indicators (DHIs). Seismic-to-well ties shows the top of the Hydrocarbon bearing sand unit lie on top of the well on the seismic section in the field.
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