Open AccessBright Spot Validation from 3-D Seismic Data: A Study of Naso-Field, Niger Delta Province, Nigeria
Publication year - 2019
Publication title -
petroleum and chemical industry international
Language(s) - English
Resource type - Journals
ISSN - 2639-7536
DOI - 10.33140/pcii.02.02.02
Subject(s) - geology , bright spot , amplitude , yield (engineering) , seismology , niger delta , fault (geology) , delta , hydrocarbon , square (algebra) , reflection (computer programming) , petrology , geometry , optics , paleontology , chemistry , engineering , physics , mathematics , computer science , thermodynamics , programming language , aerospace engineering , organic chemistry
The validation of identified bright-spots A, B and C on 3D seismic data as Direct Hydrocarbon Indicator (DHI) inNaso field, Niger Delta was achieved through the integration of four surface attributes. These attributes include rootmean square, average reflection strength, total energy, and total amplitude which are all amplitude dependent, whereregion of high value in every attribute indicated possible hydrocarbon prospects. Seismic data and check-shot data wereused, which provided positive input for velocity extraction and structural mapping interpretation. A series of NW-SEtrending normal growth faults A, B & C were interpreted defining the reservoir structural framework while fault D, E,F & G are post-depositional minor faults which also supported the trapping mechanism. Bright-spot A was mappedbetween 2,400-2550 milliseconds, while bright-spot B was mapped between 2,600-2,720 milliseconds and bright-spotC between 2,750-3,050 milliseconds. Two hydrocarbon prospects were identified. Prospect-1 was estimated to coverabout 907.17, 1323.59 and 1075.44 acres, with subsurface total vertical depth of 9514.3ft, 10499.6ft, 10963ft in BS_A,B & C respectively. Prospect-2 covered about 653.49, 1080.33 and 493.77 acres with subsurface total vertical depthof 8650ft, 9525ft, and 10120ft, respectively. Hence, prospect-1 is considerably more prolific in hydrocarbon yield thanprospect-2. The total area of the hydrocarbon prospects in-place has been estimated to about 5,533.79 acres whichis likely to yield a prolific reserve for commercial purpose. The gas Chimney and push down highlight the subsurfaceleakage of gas from a poorly sealed cap rock and show a deep petroleum migration process. The study has been ableto validate bright spot during exploration studies in effect to evaluate hydrocarbon reservoir, prospect identificationand reservoir prediction.