Duane A. Pankhurst

**** ******** **. *******, ** 77009

713-***-**** (home) 713-***-**** (mbl)

abmg3a@r.postjobfree.com

Relevant Professional History

*/** – Present Geophysicist, Sr. Rock Physics Specialist IV - Pacific Rubiales Energy, USA, Houston, TX

Major Projects

Offshore Peru – Z1 Block

• Analyze rock properties of horizons provided by interpreters for shale and suspected reservoir rocks at two levels

• Fluid substitute and perturb models for thickness, porosity, and fluid type

• Generate synthetic seismograms, calculate tuning thicknesses and compare to gathers at suspected hydrocarbon-

water-contact

• Project currently on-going

Onshore Colombia – La Creciente Field

• Oversaw vendor well-log conditioning and inversion

• Well-tied 3 wells and re-picked horizons and generated inversion to compare

• Discovered vendor used and delivered seismic at European polarity (low to high impedance contrast = trough) when

North American polarity convention was desired

• Generated fault probability maps

• Discovered an existing well that produced briefly was drilled at gas-water-contact and most likely watered out

• Project currently on-going

Offshore Guyana 3D

• Project consists of 3500 km2 of 2 overlapping seismic surveys

• Well-tied 3 wells

• One survey required significant post-migration data conditioning that consisted of residual parabolic and linear

noise removal (significant interbed multiples)

• Datasets were evaluated zero phased and matched. Long window amplitude scaling (AVO friendly) was applied,

then the surveys were merged, as best as reasonably possible, by re-binning and re-numbering inlines and crosslines

• Multiple angle stacks were generated for preliminary interpretation and attribute analysis

• Oversaw vendor reprocessing of above mentioned seismic data

Offshore Brazil – Santos Basin 3D

• Evaluated recent discovery and proposed new well location for AVO character and amplitude conformance to

structure at oil-water-contact (OWC)

• Examined wide-azimuth depth migrated seismic data for migration artifacts and other noise elements

• Complex survey geometry and processing consisted of merging earlier (2001) narrow-azimuth multi-client survey

with proprietary wide-azimuth two-boat acquisition

• Well-tied 1 well and generated offset synthetics in both in-situ and fluid substituted cases to confirm Class 4 AVO

character

• Generated rock property cross-plots to delineate sand/shale and pay/brine separation

• Created intercept, gradient, and curvature volumes, examined gathers at key locations

• Depositional environment interpreted as tidal flat with winnowing leading to tight zones of calcareous material.

Significant heterogeneities are of concern

• Currently working on probabilistic AVO by looking at P10/P50/P90 p-wave, s-wave, density and, porosity values

for input into a five-layer models perturbing thickness, rock properties and, fluids

Software Expertise

Promax, Hampson-Russell, Petral

1

Duane A. Pankhurst

1006 Woodland St. Houston, TX 77009

713-***-**** (home) 713-***-**** (mbl)

abmg3a@r.postjobfree.com

12/12 – 4/13 Sr. Reservoir Geophysicist – Unconventional Resources - Global Geophysical Services, Houston. TX

Eagle Ford – Multi-Client Seismic

• Project encompasses 800 square miles of proprietary seismic data

• Well-tied 16 wells

• Mapped the Austin Chalk, Top and Middle Eagle Ford, Top Buda, Base Buda/Top Del Rio, Top and Base Edwards,

Top and Base Pearsall

• Generated short window (8ms), medium window (60ms) and, long window (120ms) coherence volumes and

extracted fault probability volumes over the same windows using a near stack (higher fidelity) and full stack (less noise) to

understand the regional to local fault regime.

Software Expertise

Transform, Hampson-Russell

2/12 – 10/12 Senior Seismic Geophysicist - Rock Solid Images, Houston, Texas

Analyze seismic data for reservoir properties and prepare inversion products

PL-557

• Post-Migration Data Conditioning (PMDC) of 900 km2 Offshore Norway 3D seismic dataset that included 3-2D

lines approximately 50 km each.

• Each 2D seismic line was shot using the same boat and streamer configuration as the 3D data and designed to pass

through existing wells and into the 3D survey.

• Processing was amplitude compliant and targeted a primary objective. However secondary objectives were

subsequently observed and added mid-project.

• Seven wells were used for rock property analysis, 5 of which were along the 2D lines while two wells were within

the 3D survey.

• Three-layer AVO models were generated perturbing thickness and porosity for 3 fluid substituted cases (brine, oil

and, gas) for the primary target sands.

• Three-layer wedge models were also generated.

• An interesting and important observation of modeling was observed: both the overlying and the underlying shales

have lower impedance than the hydrocarbon charged rocks leading to a trough event at the top and base of the sands.

• The 3D dataset was inverted using 7 wells for the low frequency model.

• P-impedance, S-impedance, Poisson’s Ratio, Lambda Rho, Mu Rho, Porosity as well as Coherence volumes were

generated.

• For the target sands, a sand fairway on Coherence volume was observed as well as an amplitude cut-off in several of

the inverted volumes.

• A hydrocarbon-water contact was suspected and analyzed. Gathers in the hydrocarbon leg were compared and

matched to the models. Similarly, the brine leg was compared and matched to the same thickness and porosity model as the

hydrocarbon gathers.

Software Expertise

Paradigm Suite, PsPro

2

Duane A. Pankhurst

1006 Woodland St. Houston, TX 77009

713-***-**** (home) 713-***-**** (mbl)

abmg3a@r.postjobfree.com

6/07 – 12/11 Geophysicist – Chevron Corporation, Houston, Texas

Amplitude and Custom Processing – Energy Technology Company

Major Projects

Captain 3D

Post-Migration Data Conditioning of a North Sea seismic dataset. This dataset was the first Q-

marine acquisition by Schlumberger. Due to hard water bottom and thick chalk horizon, multiple

events and energy conversion due to critical angle dominated data. Target was to image sands at

base of chalk.

• Originally the vendor simply muted the data at ~30degrees

• Using a suite of proprietary tools, multiple energy was removed as well as noise due to

converted energy

• Delivered gather data to 45degrees and in some locations 60degrees depending on velocities

• Response from the business unit was very positive and considered this volume the dataset of

choice

• Although their drilling budget was cut by they drilled 6 successful wells within a year

based on the confidence of the dataset

• Norway 2D

Project consisted of 12-2D lines within the Outer Voring Basin for evaluation prior to bid round.

Challenges consisted of hard water bottom and sub-basalt imaging. Water bottom, interbed, and

top basalt multiples dominated the data. Data was from a proprietary acquisition with no vendor

pre-processing.

• Developed iterative workflow to define multiples from primaries

• This consisted initially of generating constant velocity stacks to define first cut velocity field

for NMO

• Found there were several ‘families’ of multiple events (short path and long path).

• The strategy was to iteratively flatten primaries with velocity analysis and run radon

multiple attenuation that parameterized for long path multiples

• Further, radon was parameterized to leave events that weren’t optimally flat alone (within

750ms window)

• Found that the data required up to 5 iterations of velocity and radon work to feel confident

multiples were removed and primaries remained

• This was one of the first pre-migration data conditioning projects done at Chevron

• Interpreter felt this was one of the cleanest sub-basalt imaging he had seen

• Chevron got into the block

Angola Block 0 3D

PMDC project that consisted of a test area within a larger dataset. The objective was to provide

an amplitude compliant PMDC product for better imaging of a carbonate reservoir and pre-salt

sediments.

Glenlivet 3D, Moulavi Bazaar 3D, Labrador 2D, and Swanson River 3D

PMDC projects in North Sea, Bangladesh, Offshore Labrador, and Alaska land based,

respectively

Temporary Rotation Assignment to Lekki office in Nigeria

Most of 2011 was on assignment to Nigeria BU. Position was originally defined as a

continuation of a business model to supply processing services in-country due to cost recovery

3

Duane A. Pankhurst

1006 Woodland St. Houston, TX 77009

713-***-**** (home) 713-***-**** (mbl)

abmg3a@r.postjobfree.com

mandates. However the need for Reservoir Properties from Seismic work developed. Time was

spent mentoring nationals and working on AVO and inversion related projects.

• Most of the work was a fit for purpose geophysical effort

• Guide interpreters with seismic stratigraphic mapping and amplitude understanding

• Train nationals on fluid substitution, rock property trend analysis, and gradient stack cross-

plotting

• Work on inversion for sand pinch-out potential on Agbami development well

• Evaluate rock property AVO trend deepening analysis below geopressure for Funiwa and

Chioma North fields as part of commercialization of deep gas for Brass LNG plant

Additional Work/Accomplishments

Won two team level awards for technical excellence. These were for Angola Ultra Deep 3D and

Norway 2D projects.

Provide input to research team for improvement to processing algorithms

Benchmarked CPU speed versus CPU processors for many typical flows (radon, stack,

interpolation, etc.)

Software Expertise

Promax, JavaSeis, Paradigm EPOS

8/03 - 6/07 Geophysicist – Chevron Corporation, Houston, Texas

Reservoir Properties from Seismic – Energy Technology Company

Major Projects

Nigeria Regional AVO Database (NRAD)

Develop and construct analysis methodologies and standardized workflows into a range of both local

and regional AVO data building a compendium of information for the business unit to readily access

and utilize in exploration efforts.

• Compiled data from approximately 20 Nigeria deepwater wells. These include wells from fields: Agbami, Aparo,

Bonga, Bilah, Iroko, Nsiko, Nnwa-Doro, Obeje, Tubara, Ukot, and Usan

• Work included QC and standardize well logs (interactive with petrophysicists)

• Generate regional and local fluid properties for correct fluid substitution

• Create cross-plots to examine shale, brine, and hydrocarbon trends

• Calculate full elastic wave synthetics

• Compare full elastic wave synthetic to acquired gathers

• Create half-space AVO models including fluid vector calculations of each producing horizon at each well

• Generate tuning curves and porosity sweeps at each producing horizon

• One of the outcomes of the work showed that AVO character (Class) was controlled by depth below mudline except

where cemented rocks were thrust upward. These rocks tend to retain their AVO character of pre-thrusting

Taught specialized work-flows to new team members. Traveled to Nigeria for ‘technology transfer’ to

present workflows and analysis

Nsiko Prospects

Evaluated three prospect locations for AVO characterization and analysis. Presented results to

Exploration Risk Team (ERT).

• In addition to NRAD developed workflows, a probabilistic AVO approach was employed

whereby, on a sample by sample basis, rock property ‘triplets’ (Vp, Vs, density) from well logs

were used in a Monte Carlo simulation to define probabilistic reflectivity ranges for hydrocarbon,

brine, and shale at a zone of interest

4

Duane A. Pankhurst

1006 Woodland St. Houston, TX 77009

713-***-**** (home) 713-***-**** (mbl)

abmg3a@r.postjobfree.com

• Further, this was the first time within Chevron that seismic data was calibrated to well

synthetic data and at the prospect locations the brine and hydrocarbon legs were extracted and

shown to fall within the modeled probabilistic gradient stack space from the well

5

Duane A. Pankhurst

1006 Woodland St. Houston, TX 77009

713-***-**** (home) 713-***-**** (mbl)

abmg3a@r.postjobfree.com

Angola Ultra Deep Prospects

Evaluated several prospect locations for AVO characterization and analysis in 4000 km2 block.

Presented results to Exploration Risk Team (ERT) in preparation for bid round.

• Work consisted of calibrating seismic from a single well location at nearby block (approximately 80km away),

continuing calibration across two 2D lines and into the block

• Generated ‘pseudo’ gathers by stacking small angle ranges of data

• This took advantage of the power of stack to reduce noise in conjunction with time varying trim static algorithm

(long window parameters) to align events while preserving Class 2 AVO character

Obo/Kianji Evaluation

Developed a new workflow for ‘shallowing’ rock properties to a proposed prospect location

• Used velocity analysis as a proxy for rock properties at existing well locations to compare and predict properties at

prospect location

• Due to cemented/non-cemented and geopressure/non-pressure responses, a two-end member scenarios were

presented

Additional Work/Accomplishments

Won division level award for NRAD work

Mentored Nigerian nationals and several interns.

Taught AVO analysis classes.

Presented results of Nsiko work to Dr. Daukuro the Nigerian Oil minister as part of a group of

presentations showcasing technical work done by ETC.

Software Expertise

Hampson-Russell, Syntool, GoCad, Geolog, proprietary packages

9/99 - 8/03 Geoscientist (contract) – TEXACO, Houston, Texas

Latin America Business Unit – Venezuela: Hamaca Team

• Inspected suites of well log curves for 150 wells for consistency

• Earmarked problematic curves for petrophysical evaluation

• Generated cross-sections and built maps

• Used ZMap for reserve calculations

• Manage Landmark database including overseeing work of data loading personnel

Software Expertise

SeisWorks, StratWorks, ZMap, PetroWorks, Petrosys, ArcView, and Canvas

Education University of Colorado, Boulder, Colorado, Geology, B.A.

University of Houston, Houston, Texas, Geophysics, M.S.

Professional Registered Geophysicist – Texas #6793

Registration Registered Geologist - California #6185

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