Itsemode Afinotan

• QA/QC Geophysicist - Agbami 4C OBN 4D Monitor-3 NNPC/NAPIMS Technical Bid. Project objective for M3 acquisition in Agbami is for high quality 4D dataset to support NNPC/Chevron's 2023 drilling program through the successful tender process for Seismic and Navigation QA/QA lead roles.

1. Worked with Contractor for the entire technical bid process through

to successful submission of bid for both the Seismic QA/QC and

Navigation QA/QC lead roles for Agbami 4C OBN 4D M3 Survey

2. Attended virtual Technical Bid Clarification meetings on behalf of

Contractor with Chevron's Applied Research and Technology Services

(ARTS) team in January 2022

3. Filled out and completed Chevron's form E (Technical Submission

Summary) for both Seismic and Navigation QA/QC lead roles for

Agbami 4C OBN 4D M3 Survey

4. Worked with Contractor to fill out all job experience roles and

qualifications for both Seismic and Navigation QA/QC lead roles.

5. Worked with Contractor to fill out all HSE and SIMOPS related roles in

technical bid for both Seismic and Navigation QA/QC lead roles.

Completed and delivered on all goals related to successful submission of technical bid for Seismic and Nav QA/QC roles in Agbami 4D M3 survey and signed-off on project.

• Velocity Model Review and Update: Carried out velocity volume review and update in Petrel for OML 55 marginal field on behalf of Substrata Oil and Gas for her client. Interpolated velocity model volumes are critical for optimal time to depth conversion of interpretation horizons and reservoir sand tops. Updated velocity model volume with inclusion of additional well-to-seismic tie curves from Robertkiri and Inda fields were part of the marginal field operator's asset team field development study for new well drilling campaign in OML 55
• Seismic Impedance Inversion Study: Carried out zero-offset seismic impedance inversion for OML55 Prestack Time Migration (PSTM) volume from the 1995 vintage on behalf of Substrata Oil and Gas for her client. . Project scoping was carried with clearly defined goals and deliverables to include the following:

(i) Rock property cross-plots to demonstrate the amenability of

seismic impedance inversion study in delineating reservoir-type

"sands" from surrounding background "shale" response

(ii) Deliver on fit-for-purpose inverted P-impedance volume for use as

volume backdrop for static reservoir characterization models.

(iii) Complete and present concise summary of seismic impedance

inversion study including all time-depth curves employed, extracted

seismic wavelet used and inverted P-impedance volume in digital

media.

• Seismic impedance inversion study was properly scoped and executed with deliverables met with accompanying reports and digital volumes submitted on schedule and project signed-off.

• Seismic Impedance Inversion Studies.

Project deliverables included:

(i) Generation of sand-shale probability volumes for porosity and

litho-facies prediction.

(ii) Final PowerPoint presentations and project sign-off.

Results and lessons learned from seismic impedance inversion studies added considerably to Chevron Nigeria's Exploration Assets Teams subsurface reservoir characterization efforts and hydrocarbon reserves addition.

• Seismic Forward Model Response (AVA) Studies.

Project deliverables included:

(i) Generation of wiggle-trace synthetic angle gathers, seismic

gradient-stack (A1-S) crossplots, probabilistic AVA forward models

for reservoir porosity and thickness estimation in support of

Chevron's Corporate Amplitude Risking and Scoring of prospective

hydrocarbon reservoir sands.

(ii) Final PowerPoint presentation and project sign-off.

Results and lessons leaned from AVA studies of target reservoir sands contributed greatly to Chevron Nigeria's Exploration Asset Teams reservoir characterization and reserves addition efforts

• Post Migration Seismic Data Conditioning Studies

Project deliverables included:

(i) Generation of enhanced seismic angle stacks and gathers with

significantly improved event alignment, compensation for offset

dependent frequency loss, and improved signal-to-noise ratio

(ii) Final PowerPoint presentation and project sign-off.

Results and lessons leaned from Post Migration Data Conditioning Studies greatly underscored the importance of the availability of fit-for-purpose seismic angle gathers and stacks for Chevron Nigeria's Exploration Asset Teams reservoir characterization and reserves addition efforts.

• Seismic Processing QA/QC Studies.

Project deliverables included:

(i) Active participation in CNL Agbami 4D OBN Monitor-1 Geophysical

Reservoir Characterization Study in OMLs 127 and 128 Offshore

Nigeria from 2013 to 2015.

(ii) Carried out seismic QA/QA roles in close collaboration with

Contractor personnel on seismic acquisition survey grid and

binning parameters.

(iii) Final PowerPoint presentation and project sign-off

Results and lessons leaned from seismic processing QA/QC studies ensured the delivery of fit-for-purpose wide azimuth seismic offset gathers with required fold coverage for input into Chevron's Reservoir Properties from Seismic (RPFS) estimation workflows.

• Training and Mentoring

1. Organized and supervised training and mentoring on a broad

spectrum of quantitative seismic interpretation workflows ranging

from seismic-to-well ties to high-end simultaneous impedance

inversion techniques for quantitative seismic interpretation to

several graduate and undergraduate interns.

1. Implemented Chevron's Custom Amplitude Processing workflows on several vintages of seismic datasets from the Great White Field in Gulf of Mexico. Amplitude Processing workflows include seismic dataset denoising and signal-to-noise enhancing algorithms before datasets are employed in geophysical reservoir characterization workflows.

2. Performed rock properties cross-plots using Chevron's RPFS - FEQC Workspace for a suite of well log curves from the Great White field in Gulf of Mexico. Petrophysical log curves for input into geophysical reservoir characterization workflows or into quantitative seismic interpretation studies are required to be of high fidelity and fit-for-purpose. Sonic curve cycle skips and despiking are examples of petrophysical log curve problems to be addressed by implementing Chevron's RPFS-FEQC Workspace.

3. Performed well-to-seismic ties for time-depth and wavelet estimation using well log curves from Chevron's RPFS-FEQC workspace and seismic zero-offset and partial angle stacks from Chevron's Custom Amplitude Processing workflows in Great White field.

4. Implemented Seismic Impedance Inversion for both zero offset and partial angle stacks from Great White Field in Gulf of Mexico. Inputs to both acoustic impedance inversion and the more sophisticated simultaneous inversion were fit-for-purpose seismic datasets from Chevron's Custom Amplitude Processing workflows and petrophysical well log curves from RPFS-FEQC Workspace.

5. Documented and presented results and lesson learnt from eighteen months implementation of a broad range of quantitative seismic interpretation workflows from fit-for-purpose petrophysical log curve enhancements to seismic impedance inversion workflows to both Chevron Energy Technology Company's RPFS Team in Houston, TX and Chevron Nigeria's Geology and Geophysics Teams in Lagos, NG.

• QA/QC Seismologist - Ofagbe 3D HiRes Seismic Survey.

Ofagbe 3D (OML 42) High Resolution (HiRes) seismic acquisition

survey commissioned by SPDC Western Division in 1999 and carried

out by CNPC / BGP.

Key Job Responsibilities included:

1. Seismic survey navigation QA/QC for shot and receiver lines binning

and parametrization according to client's specification for required

multiple fold coverage and redundancy.

2. Seismic Up-hole survey QA/QC for P-wave weathering velocity

determination.

3. QA / QC of monitor shot records in strict accordance to client's

specification before linear moveout and brute stacking.

Completed and delivered on all responsibilities related to successful completion of Ofagbe 3D HiRes Seismic survey in accordance to SPDC's

specification.