Integration of Seismic and Well Log Data Using Acoustic Impedance for Lithology and Hydrocarbon Evaluation of “Ovi” Field, Niger Delta
AbstractThis research work is aimed at using acoustic impedance as means of predicting lithology and hydrocarbon away from well control of “Ovi” Field hence providing a detailed evaluation of the hydrocarbon potential of the area. The methodology used involves identification of hydrocarbon bearing reservoirs from well logs using Gamma ray and resistivity logs, wells correlation, petrophysical analysis, well to seismic tie, horizon and fault mapping, generation of structural maps, acoustic impedance crossplot analysis and seismic inversion using model based approach. Three reservoir sand were mapped within the Agbada Formation. From the crossplot of acoustic impedance against gamma ray, porosity and water saturation, the acoustic impedance ranges from 24500-27500 (ft/s)*(g/cc) for shale and 17500-24500 (ft/s)*(g/cc) for sand based on the saturating fluids, the results also shows that acoustic impedance have a linear relationship with water saturation, while porosity have an inverse relationship with acoustic impedance for the study area. Average acoustic impedance maps for reservoir tops generated from the inverted seismic data indicated areas of low acoustic impedance corresponding to hydrocarbon bearing zones that were not detected on the time maps. The result provided detailed information about the subsurface lithology and hydrocarbon saturation away from well control of the study area.
. Avadhani, V.L., Anandan, M., Thattacherry, B.J., Murthy, K.S., Gariya, B.C., and Dwivedi A.K., (2006). Acoustic impedance as a lithological and hydrocarbon indicator: The Leading Edge. Vol.25, No.07, p.854-858.
. Badri, M., Svendsen, M., and Egan, M., (2002). Reducing drilling risk through improved seismic imaging. Utilizing new signal-sensor acquisition technology: AAPG Annual International Meeting, Cairo, Egypt.
. Doust, H., and Omatsola, E.M., (1990). Niger Delta, in, Edwards, J. D., and Santogrossi, P.A., eds., Divergent/passive Margin Basins, AAPG Memoir 48: Tulsa, American association of Petroleum geologist, p.239-248.
. Evamy, B.D., Hareboure, J., Kamerling, P., Knaap, W.A., Molloy, F.A., and Rowlands, P.H., (1978). Hydrocarbon habitat of Tertiary Niger Delta: American Association of Petroleum Geologist Bulletin, Vol 682, p.277-298.
. Hampson and Russell Software Services Ltd., (1999). STRATA.
. Mitchele, L.W., Turtle, R., Charpentier., and Michael, E.B., (1999). The Niger Delta petroleum system: Niger Delta Province, Nigeria, Cameroon and Equatorial Guinea, Africa. USGS. Denver Colorado, Open/file report 99-50-H.
. Murat, K., (1972). Stratigraphy and paleogeology of crateous and lower tertiary in Southern Nigeria: Proceeding first conference on African Geology, Ibadan 1970, proceeding, Hs: Ibadan University press, p.251-266.
. Short, K.C and Stauble, J., (1967). Outline geology of the Niger Delta: American Association of Petroleum Geologist Bulletin, vol.5, p.761-779.
. Shrestha, R. K., and Boeckmann, M. K. (2002, October). Stochastic seismic inversion freservoir modeling. In 2002 SEG Annual Meeting, p.2
. Singh, H., Subbrayudu, K.,Mohorana, A., Singh, M.K., and Kumar, A., (2013). A deterministic approach to reservoir characterization through quantitative interpretation: A case study from heara field, western offshore India: Society of petroleum geophysics 10th biennial international conference and exposition, p.427.
. Stacher, P., (1995). Present understanding of the Niger Delta hydrocarbon habitat, in Oti, M.N., and Postma, G., eds Geology of Deltas: Rotterdam, A.A. Balkema, p.257-267.
Authors who submit papers with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
- By submitting the processing fee, it is understood that the author has agreed to our terms and conditions which may change from time to time without any notice.
- It should be clear for authors that the Editor In Chief is responsible for the final decision about the submitted papers; have the right to accept\reject any paper. The Editor In Chief will choose any option from the following to review the submitted papers:A. send the paper to two reviewers, if the results were negative by one reviewer and positive by the other one; then the editor may send the paper for third reviewer or he take immediately the final decision by accepting\rejecting the paper. The Editor In Chief will ask the selected reviewers to present the results within 7 working days, if they were unable to complete the review within the agreed period then the editor have the right to resend the papers for new reviewers using the same procedure. If the Editor In Chief was not able to find suitable reviewers for certain papers then he have the right to accept\reject the paper.B. sends the paper to a selected editorial board member(s). C. the Editor In Chief himself evaluates the paper.
- Author will take the responsibility what so ever if any copyright infringement or any other violation of any law is done by publishing the research work by the author
- Before publishing, author must check whether this journal is accepted by his employer, or any authority he intends to submit his research work. we will not be responsible in this matter.
- If at any time, due to any legal reason, if the journal stops accepting manuscripts or could not publish already accepted manuscripts, we will have the right to cancel all or any one of the manuscripts without any compensation or returning back any kind of processing cost.
- The cost covered in the publication fees is only for online publication of a single manuscript.