Contact Information

  • Iryna Marchiano
    (832) 287-2465


  • Reservoir engineer with an advanced degree and 15 years of experience working for major E&P and service companies, specializing in reservoir simulation, history matching and uncertainty management.
  • Broad experience working both green and brown field assets, domestically and internationally.
  • Passionate about innovative application of data science and analytic solutions for asset development planning, optimization and forecasting. Experience with Agile DevOps product/software development.
  • Interested in full-time or contract Houston-based or remote work opportunities.




Houston, TX



2007-2020 CHEVRON CORP (full-time)

Reservoir Engineer, 2019-2020
Tengizchevroil (Atyrau, Kazakhstan)
Ownership and maintenance of the Tengiz field dynamic model and performance of annual updates.
Support of the field development planning activities, including provision of relevant models for reserves booking; communication and reporting to partners and subsurface assurance teams; development of TIBCO Spotfire solutions for streamlining the annual field and well performance analysis, history matching quality assurance and updates.
Heavily involved with mentoring of the local workforce on the use of PetrelRE and INTERSECT as well as Business Intelligence and analytics.

Appraisal Reservoir Simulation Engineer, 2016-2019
Gulf of Mexico Business Unit (Houston, TX, USA)
Pre- and post-drill recovery efficiency evaluation of deepwater GOM prospects and discoveries. Reservoir engineering support for early appraisal of Whale (Wilcox, Shell operated) and Ballymore (Norphlet, aeolian, Chevron operated) fields including construction of the dynamic simulation models. Developed and deployed TIBCO Spotfire and Microsoft Power BI dashboards for reservoir data pre- and post-processing, field performance and project analytics.
Graduated from Chevron's internal Data Science Development Program (7 months long program to increase one's understanding of data science, analytics & ML, 100 participants selected worldwide in 2019).
1st place prize in GOM Power BI Hackathon as both project owner and project lead delivering universal asset development analytics dashboard.
Part of MVP1 team developing a corporation-wide web-based analytic tool for asset monitoring and forecasting, using the Agile DevOps framework.

Reservoir Engineer & Well Planning Lead, 2013-2016
Southern African Strategic Business Unit (Houston, TX, USA)
Built and history-matched new Malongo West field (offshore Angola) dynamic model using innovative dual porosity dual permeability modeling methodology for modelling vuggy carbonates.
Developed a new 14-well asset development plan, with EUR incremental of 66MMBOE. Developed an analytical factory model workflow for maturation of 3 new drills with projected 17.6MMBOE incremental recovery. Led a multidisciplinary team of G&G, D&C and facility engineering professionals in planning of aforementioned wells.
Recognized as a key business unit subject matter expert on the use of Petrel, INTERSECT and an in-house uncertainty assessment and optimization software.
Co-organized annual Well Jacket Reviews held jointly with the in-country asset team; streamlined reviews by developing a versatile TIBCO Spotfire dashboard for well performance analysis, well work, surveillance tracking and jacket slot inventory.

Lead Reservoir Simulation Consultant / Chevron secondee, 2011-2012
Schlumberger SIS Abingdon Technology Center (Abingdon, UK)
Chevron in-house rep at the Schlumberger Abingdon Technology Center, working on INTERSECT reservoir simulator testing and deployment within the Triple Crown industry initiative (Chevron, Schlumberger and Total). Performed benchmarking studies, provided consulting services and project support for INTERSECT software deployment (black oil and compositional models, models with priority-based re-injection logic, compositional flow tables, hysteresis). Conducted feasibility studies for well type and completion type selection for naturally fractured reservoirs. Co-authored and facilitated in-house training courses related to uncertainty assessment, assisted history matching and optimization.

Reservoir Simulation Consultant, 2008-2011
Chevron Energy Technology Company (Houston, TX, USA) &
Chevron Nigeria Limited (Lekki, Nigeria)
Conducted studies on onshore and offshore fields in Kazakhstan, Nigeria, USA (CA) and Angola with projects ranging from OOIP uncertainty estimation to field development optimization studies with the application of Design of Experiments and a variety of heuristic optimization techniques. Was actively involved in course preparation/facilitation and teaching activities within the company (Instructed the “Uncertainty Management Using Design of Experiments” training course; co-authored and instructed “Assisted History Matching” training course)

Intern, 2007
Chevron Energy Technology Company (Houston, TX, USA)
Performed a comparative study of Population-Based Incremental Learning algorithm and Genetic Algorithms for probabilistic history matching of Tengiz oil field (Kazakhstan).
Performed a comparative study of the commercially available and the in-house optimization software packages, both running Genetic Algorithms as optimization engine. Collaborated with CVX R&D department, incorporating research code written in C within the in-house optimization software package written in C++ within the span of 1 week, including appropriate testing and debugging.

Intern, Geoscience Research Center (Aberdeen, UK)
History matching of the Middle Eastern oil field using advanced evolutionary-based optimization algorithms and geostatistical modelling tools (GOCAD).

2005-2007 SCHLUMBERGER (contract)
Guest Tester
SIS Abingdon Technology Center (Abingdon, UK)
Conducted regression testing and benchmarking studies of the following software products: Eclipse 100 Black Oil, E300 Compositional, E100/300 PARALLEL. Responsible for testing and preparation of the manual material for the first commercial release of Petrel RE (specifically the Well Completions module). Performed parallel scalability studies for a variety of model types and geometries, investigating a number of model partitioning approaches.


2009 PhD, Computational Physics
Imperial College London, UK
Thesis title “Estimation of Distribution Algorithms for History Matching Optimization”

2004 Masters, Petroleum Engineering
Ivano-Frankivsk National Technical University of Oil & Gas, Ukraine
Thesis title “Deterministic inverse modeling and electro-hydrodynamic analogy based history matching of the Lukva Oil Field, Ukraine”

2003 Bachelors, Petroleum Engineering
Ivano-Frankivsk National Technical University of Oil & Gas, Ukraine