Hydrocarbon Generative Windows Determination Using Geomathematical Model: Case Study from Ogbogede Field, Niger Delta, Nigeria
Abstract
Oil and gas generative windows of source rocks in Niger Delta have been determined by applying a mathematical model to geotemperature data from the wells of Ogbogede oil field. GR and Resistivity log signatures show that the Benin and Agbada Formations comprises massive sands with clay intercalations while the Agbada Formation comprises alternate sequence of sandstones and shales. The geothermal gradients for the field range from 1.4oC/100m to 2oC/100m with an average of 1.8oC/100m and standard deviation of 0.2oC/100m. Geotemperature analysis of shales of the Agbada Formation varies from 58.92oC-107.6oC, indicating that they are thermally mature and within the oil generative window, at depths varying approximately from 1833.30 m to 5166.67m. The gas window occurs from 5166.67 m to 11000 m. This work has provided a mathematical method of source rock evaluation to compliment geochemistry. The outcome is a very important tool, which can be applied to other fields and sedimentary basins in hydrocarbon exploration.
Keywords: Hydrocarbon Generative Windows, Geotemperature data
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ISSN (Paper)2224-3186 ISSN (Online)2225-0921
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