Contact Information

  • Jessica Maddox
    (713) 817-8194


  • Results-driven, detail-oriented Geoscientist with 15 years of experience in exploration and development of both Conventional and Unconventional reservoirs
  • Value creation through petroleum systems analysis, sequence stratigraphy, reservoir characterization, and multi-disciplinary integration for effective reservoir appraisal and development
  • Collaborative team leader and mentor with strong communication skills and commercial focus
  • Continuous learner with desire to enhance technical expertise through continued development of reservoir modeling and business acumen


Houston, TX


2013-2019 Anadarko Petroleum Corporation – The Woodlands, TX
 2017-19 Staff Geologist, Area 1 Offshore Block Mozambique
o Lead Geologist for Golfinho-Atum Field ($20 BN LNG Development).
o Responsible for reservoir characterization of field through integration of well log analysis, core analysis, and seismic stratigraphy.
o Prepared resource estimation for post-FID initial reserve booking, verified through substantive test by 3rd party reserve auditor.
o Contributed to creation of stochastic reservoir models utilizing Petrel to evaluate range of potential GIIP and analyzed results from 500+ realizations to understand key reservoir drivers.
o Presented methodology and results of technical analysis to project partners and management.
o Prepared written documentation of subsurface technical studies and served as technical editor for other disciplines.
o Hand-contoured maps for low, mid, & high case interpretations of NTG and Vclay per geobody to guide property distribution within model realizations utilizing seismic attributes, well data, and knowledge of deepwater depositional systems.
o Responsible for well planning and data acquisition for 18 well Phase 1 development program.

 2016 Staff Geologist, Delaware Basin Asset Team
o Responsible for geological evaluation of all non-operated well proposals and collaboration with reservoir engineer to make technical recommendations for well elections to enhance Anadarko’s investments.
o Initiated new data management systems to improve tracking of well data from non-op wells, farm-outs, and data trades, resulting in improved reservoir analysis.
o Developed strong relationships with partners for improved knowledge sharing and learning; facilitated partner workshop with Shell on well spacing; conducted competitor analysis.
o Managed day to day responsibilities of 2 geotechs and mentored new hire geologists and summer intern.

 2013-15 Staff Geologist, East Texas/North Louisiana Asset Team
o Evaluated potential productivity of Cotton Valley Taylor in two prospect areas through sequence stratigraphic correlation, reservoir structure and property maps, and evaluation of offset production. Responsible for all well planning, data acquisition (whole core, SWC, well logs), analysis, and budget associated with exploitation wells.
o Conducted geological evaluations of potential acreage deals and worked with subsurface and land teams to make leasing recommendations.
o Planned and drilled Cotton Valley Taylor horizontal infill wells in Henderson Field.
o Mentored less experienced geologists to ensure technical excellence was established and valued.

2007-2013 Marathon Oil Company – Houston, TX
 2011–13 Advanced Geologist, US Onshore New Ventures
o Regional evaluation of the hydrocarbon potential of unconventional and conventional reservoirs in the Lower and Upper Cretaceous formations of the onshore Gulf Coast Basin, including Eagle Ford, Eaglebine, and Pearsall formations.
o Responsibilities included developing a regional sequence stratigraphic framework, play fairway analysis, calculating resource in place estimates for identified prospects, monitoring competitor activity and production, and presenting recommendations to upper management.
o Recommended and drilled 2 wells to test play concept. Responsible for all well planning, data acquisition (whole core, SWC, well logs, isotubes), and analysis associated with these 2 wells.
o Described core as part of regional evaluation of the Tyler Formation, Williston Basin.

 2008-11 Geologist II, Piceance Asset Team
o Development/operations geologist for 65 vertical wells. Responsibilities included well planning, creating and maintaining structure and isopach maps, formation evaluation, and pay identification for completion intervals.
o Coordinated with Drilling, Completions, Regulatory, and Land teams on an ongoing basis.
o Led subsurface recommendation (and received management approval) for data acquisition program consisting of 3D seismic, microseismic, isolated production testing, DFITs, and gas isotope analysis in an effort to optimize development and maximize well productivity of field.
o Served as Marathon Oil liaison for 2 Piceance-related JIPs and mentored summer intern.

 2008 Geologist II, Marcellus Shale Asset Team
o Conducted geological evaluation of leasing opportunities and worked with Subsurface and Land teams to make purchase recommendations.
o Worked with Subsurface team to create an acreage evaluation and data acquisition program. Identified well locations and mapped shallow formations to aid in well planning.
o Mentored summer intern.

 2007-08 Geologist II, Barnett Shale Asset Team
o Operations geologist responsible for identification of well locations, well planning, log and core acquisition, and geosteering.
o Prepared well files, maps, and presentations for Barnett acreage disposition. Presented geological overview to potential buyers in data rooms.

2005-2007 Core Laboratories, Integrated Reservoir Solutions Division – Houston, TX
 Senior Geologist, North American Gas Shales Joint Industry Project
o Responsible for integration and interpretation of sedimentological, petrographical, petrophysical, geochemical, and geomechanical data of various gas shale formations in order to improve formation evaluation and optimize stimulation and production.
o Described slabbed core, analyzed thin sections, and designed core sampling program based on petrophysical facies.
o Communicated results and interpretations to clients.

Awards and Certifications

Professional Geoscientist - Louisiana Board of Professional Geoscientists


- reservoir characterization
- petroleum systems analysis
- sedimentology/sequence stratigraphy
- well correlation
- geologic mapping
- formation evaluation
- resource estimation
- geomodel interrogation
- data acquisition
- development planning and execution
- core description and core analysis
- data integration
- Petrel
- Petra
- Geographix
- Spotfire
- Microsoft Office


2002-2005, Rice University (Houston, TX)
Master’s Degree/Geology & Geophysics, GPA 3.92

1998-2002, Millsaps College (Jackson, MS)
Bachelor of Science/Geology, GPA 3.79
Honors in Geology; Magna Cum Laude