Charles Cusack Expert Witness

Experts in all aspects of upstream oil and gas

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Specialties & Experience of this Expert Witness

General Specialties:

Oil and Gas and Geology

Keywords/Search Terms:

Land, Engineering, HSE, Structural mapping, Title, Drilling Operations, Production, Horizontal wells, Geophysics, Completion Operations, Exploration, Reservoir Engineering, Safety, Stratigraphy

Education:

BS Geological Engineering, Texas A&M

Years in Practice:

43

Additional Information

AREAS OF EXPERTISE Oil and gas exploration, exploitation, and development • Proficient in all areas of upstream oil and gas • Have supervised the drilling, completion, and production of over a thousand oil and gas wells • Familiar with industry accepted and customary practices Gulf Coast, Gulf of Mexico, US shale plays • Have extensive experience throughout these areas • Have worked 249 distinct trends, fields and prospects (see addendum) Operational planning and oversight of drilling programs • Preparing geological prognosis • Review drilling procedures • Adherence to state and local regulations • Monitoring daily mud logs, directional targeting, MWD, and geosteering • Recommending specific coring and logging programs • Interpreting well logs, core analysis, and mud logs • Deciding on major drilling decisions such as whether to complete a well, sidetrack, or plug it • Review of completion design and procedures including fracking operations • Review facilities design including handling of H2S • Marketing for oil and gas • Disposing of produced water Reservoir characterization and reserves • Making structure maps • Interpreting faulting • Assessing stratigraphic continuity • Generating isopach maps • Performing petrophysical evaluations • Determining original and current hydrocarbons in place • Determining remaining proved, probable, and possible reserves • Determining remaining number of potential drilling locations including PUD’s, probable, and possible locations Prospect generation, evaluation, and risk assessment • Generated numerous prospects throughout these basins • Evaluated countless company and third-party prospects throughout these basins • Made decisions to drill or not drill them based on the potential reserves, risk assessment and economics Seismic interpretation (2D & 3D) • Proficient in 2D and 3D seismic interpretation • Experienced with AVO and attribute work • Used SMT and Landmark workstations • Negotiated seismic contracts Risk assessment and valuation • Expert at risk assessment because of unique ability to look at all the variables combined with my years of experience doing the same • Valuation expert due to critically questioning all the mapping, petrophysical, and reservoir properties needed to calculate the same Oil and gas leasing • Have provided oversight for over 1 million acres of leased lands • Directed the areas to lease based on geology, reservoir conditions, and economics • Personally negotiated numerous leases, farm-ins, and acquisitions PROFESSIONAL SUMMARY Petroleum geologist and executive with over 40 years of experience in oil and gas exploration and development across the Gulf Coast, Gulf of Mexico, and major U.S. shale plays. Extensive experience evaluating and developing oil and gas assets, negotiating transactions, managing multidisciplinary teams, and generating drilling prospects. Has worked in over 249 oil and gas fields and prospects and has direct experience across nearly all major Gulf Coast trends and play types. Currently provides consulting and expert witness services for both plaintiff and defense counsel. EXPERT WITNESS EXPERIENCE LEGOIL CONSULTING — Managing Partner (2026 – Present) • Provide expert witness and consulting services in oil and gas matters • Available for deposition and trial testimony