INTERPRETATION OF 3-D SEISMIC REFLECTION DATA FROM “BETA” FIELD, NIGER DELTA, NIGERIA.

AUTHOR: IREDU, AMAKA NWABIACHIE

DEPARTMENT: PHYSICS AND INDUSTRIAL PHYSICS

AFFILIATION: NNAMDI AZIKIWE UNIVERSITY, AWKA

The subsurface structure of Beta field located in the Niger Delta, Nigeria was mapped with the aim of exploring for hydrocarbon. Faults were delineated in the field. These faults were seen not to be continuous and were simply normal faults. Sequel to the fault delineation, three horizons were picked and mapped. These horizons were identified as horizon D2000, D3000 and D4000. These three horizons gave the physical features of the Beta field at various depths. The shallowest and deepest parts of horizon D2000 were estimated at depths 3000ft (909m) and 6200ft (1877m) respectively. The shallowest and deepest parts of horizon D3000 were estimated at 4200ft (1273m) and 8200ft (2485m) respectively. The shallowest and deepest parts of horizon D4000 were estimated at 4200ft (1273m) and 9900ft (3000m). These horizons gave closures that were hydrocarbon bearing. The volumes at these closures were combined with relevant petrophysical data to estimate the quantity of hydrocarbon in them. For horizon D2000, two closures were identified named closures 1 and 2. The quantity of hydrocarbon estimated for closures 1 and 2 in million stock tank barrels were approximately 53.18 and 133. For horizon D3000, one closure was identified and quantity of hydrocarbon estimated in million stock barrels is 91.90. For horizon D4000, one closure was identified and the quantity of hydrocarbon estimated in million stock tank barrels is 65.88. From the amplitude maps, it is inferred that the field is mainly gas bearing. The expectations calculated suggests several in-field appraisal prospects, but due to the poor data quality, drilling is not recommended at present. It is suggested that since there are already drilled wells in the field, a 3-D time lapse should be carried out to quantify the hydrocarbon in the field for future planning and drilling.

TO VIEW THE FULL CONTENT OF THIS DOCUMENT, PLEASE VISIT THE UNIZIK LIBRARY WEBSITE USING THIS LINK, http://naulibrary.org/dglibrary/admin/book_directory/Thesis/10980.pdf

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