Our Experts

OUR EXPERTS

Geoenergis assists companies and the government to identify the available options and factors that is necessary to be considered during planning and aim to develop the best solution in the decision-making process. The independent consultancy is conducted by experts with strong scientific and academic credential, combined with vast project experiences in the energy sector.

Our Consultants come from various backgrounds and expertise, with various level of experience.

SENIOR ADVISORS

Dr. John O'Sullivan

Geothermal Reservoir Expert

Dr John O’Sullivan is Professor Mike O’Sullivan’s son and is also a lecturer at the Geothermal Institute, University of Auckland. John continued his legacy from his father to become an expert in the field of geothermal reservoir engineering and is one of the best geothermal reservoir modellers in the world today.

John’s key skills are geothermal reservoir engineering and modelling, computational fluid dynamics, inverse modelling, and uncertainty quantification. John also has a dedicated team in Auckland that specialises in developing cutting-edge tools in geothermal reservoir modelling. Several tools in development are AUTOUGH2 (a University of Auckland TOUGH2 based simulator) and Waiwera (a new super-fast reservoir simulator), TIM (graphical user interface or GUI of TOUGH2), and a transient wellbore simulator.

Professor Mike O'Sullivan

Geothermal Reservoir Expert

Prof. Mike O’Sullivan is a globally renowned expert in geothermal reservoir engineering. He is one of the pioneers who developed the first concepts of geothermal reservoir engineering.

His research interests include modelling of geothermal fields, but more generally reservoir physics, environmental fluid dynamics, and computational fluid dynamics problems. He has pioneered computer techniques for numerical modelling of geothermal reservoir and applied them to the behaviour of many real systems. He teaches in the Postgraduate Certificate course in Geothermal Energy Technology.

Professor Adi Susilo

Sr. Geophysicist

Professor Adi Susilo is a lecturer and senior geophysicist from Universitas Brawijaya who has more than 30 years of experience in Oil & Gas and Geothermal exploration projects. He is the former dean of FMIPA from Universitas Brawijaya for 2016 – 2020; he is still active as chairman of the centre for geological studies and disaster mitigation, Universitas Brawijaya.

His key skills include geophysical surveys, including Magnetotellurics, Resistivity, Microseismic, Gravity, Magnetic, Seismic, raw data processing, and 3D data interpretation. Currently, he is working on making a UKL-UPL document for Arjuno-Welirang geothermal field, owned by PT Geo Dipa Energy.

Sam Abraham

Drilling & Project Advisor

Sam is a senior drilling engineer with 30 years’ experience on 12 countries and over 20 geothermal fields. He is specialized in project management, drilling management, rig supervision, drilling engineering, well workovers and problem well diagnosis.

His professional experience is supported by formal education background in Master of Science (MSc) of Petroleum Technology (Applied) from Pune University, India and MSc in Engineering Management from National University, CA. He is a member of Geothermal Resources Council and the International Geothermal Energy Association. Sam is also actively published papers as a SME on geothermal drilling, engineering & project management topics with hands on experience.

Agung Harijoko

Sr. Geologist

Agung Harijoko is a geologist who has been working 25 (twenty-five) years’ experience in energy industry with a half of the journey, 12 years involved in geothermal industry.

His experience in geothermal industry proved by the years of experience start from 2008 as Senior Geologist for Survey Argopuro Geothermal Area until 2019 he involved in Pre-Feasibility Study on WKP Gn. Ungaran. Now, he works as Head of Department Geological Engineering in Gadjah Mada University.

He has strong educational background in geosciences study (geology, geochemistry, and geophysics), apart from being Senior Geologist or Project Leader, in 2001 – 2018 he also active in publishing paper about geochemical, hydrothermal, geoscience study, and another topic. His key skill is, project management, geological mapping, geothermal geologist, and Geochemist.

SENIOR CONSULTANTS

Scott William Herman

Sr. Geologist

Scott W. Herman is a Geologist/Geochemist who has been working professionally in international companies and involved in many overseas projects. He has more than 12 years of geothermal experiences and have worked for several big names such as: Jacobs, Mercury, GeothermEx, Rio Tinto, Vulcan Geoscience and SYR Geociencia.

He started his journey just after he graduated from Wesleyan University U.S (1998) and started being a professional Geologist. He continued his study in University of California (2013) for a master’s degree in Geological Science.

Mary Mann

Sr. Geologist

Mary Mann is a Professional Geologist specializing in geothermal energy. She has more than 15 years of working experience. Mary has experience in all stages of geothermal energy development, from greenfield exploration program design and field work, thermal gradient, slim well, and production/injection well drilling, targeting, well site geology, geologic modeling, conceptual modeling, and drilling project planning and management. She has experience with collection and interpretation of geophysical data including EM, potential fields, reflection seismic and microseismic data.

Rony Prianto Nugraha

PhD Candidate – CEO, Res Eng, Drill Eng, and Mud Specialist

Rony P. Nugraha is the CEO of Geoenergis and is currently working on his doctoral program in geothermal reservoir engineering at the University of Auckland. Rony started his career as drilling fluid engineer for 4 years in Baroid-Halliburton and has been involved in several geothermal drilling exploration projects during that time.

After finishing his Master degree from the University of Auckland, he became a drilling engineer and mud specialist for 2 years in Rigsis and in parallel with that, he was also working as reservoir engineer and modeller for Geothermal Institute, University of Auckland. Rony’s key skills are geothermal reservoir engineering and modelling, geothermal exploration and development drilling, drilling fluids, and geothermal project management.

Daniel W. Adityatama, S.T., M.Energy

Drilling Engineer

Daniel is an engineer with experience in managing various projects in geothermal drilling planning, exploration drilling, and workover. planning, geothermal well workover planning, geothermal direct use, and geothermal exploration and development project management.

Muhammad Ghassan J. Shalihin, M.M., M.Eng.

Geothermal Geologist

Ghassan is a geothermal geologist who has been involved in several geothermal exploration projects with more than 5 years of experience.

During his Master in Universitas Gadjah Mada (UGM), he also served as junior geoscientist at Geothermal Research Center, UGM. He has strong knowledge in geothermal geology especially on subsurface geology and hydrothermal alteration, also extensive experiences in geological survey, 3D geological modelling, and petrological analysis. He worked on several geothermal field such as Sumani, Way Selabung, Candradimuka, Dieng, Candi Umbul-Telomoyo, Patuha, Sembalun, Karaha-T. Bodas, Lumut Balai, and Lahendong.

Astri Indra Mustika, S.T., M.Eng.

Geothermal Geologist

Astri is a geoscientist who has been involved in geothermal exploration and development projects for more than 5 years in several geothermal fields in Indonesia such as Darajat, Bajawa-Nage, Sembalun and Kamojang. She is a strong professional consultant with a geology and remote sensing background.

During her master study in Universitas Gadjah Mada (UGM), she joined The Geothermal Capacity Building Programme  Indonesia-Netherlands (GEOCAP) as a graduate researcher focussing on remote sensing in geothermal areas. She is also a geothermal and renewable energy enthusiast.

JUNIOR CONSULTANTS

M. Rizqi Al Asy'ari

Jr. Drilling Engineer

Al has good interpersonal skills and is able to work both as an individual as well as in a team. From early on in his career, he has shown high interests in engineering, business development, technology, and is able to work under pressure in different circumstances. These qualities makes him fit for the responsibilities of a consultant.

Nadya Erichatama, S.T.

Jr. Drilling Engineer

Nadya is part of Geoenergis and Enerka’s project. After she graduated from Petroleum Engineering ITB (2020), she started to taking part in organizing EnerKlaz, an energy online course by Enerka. During that time, she also served as Jr. Project Engineer at Geoenergis who responsible to controlling and evaluating geothermal exploration project using Ms. Project and another Project Management tools.

Triwening Larasati, S.Si.

Jr. Geologist

Triwening Larasati is a geoscientist who has an interest in geothermal and renewable energy. She is most familiar with geothermal geology, especially in 3D geological modeling and petrological analysis. Her versatile background plus passion makes her adaptable to  her works easily.

Since finishing her bachelor’s degree with a thesis in assessing the geothermal prospect of Galunggung, she has been more involved in several geothermal projects such as the ones located in Sembalun, Sokoria, and Kamojang, both in the exploration and development phase.

Triwening Larasati, S.Si.

Jr. Geologist

Triwening Larasati is a geoscientist who has an interest in geothermal and renewable energy. She is most familiar with geothermal geology, especially in 3D geological modeling and petrological analysis. Her versatile background plus passion makes her adaptable to  her works easily.

Since finishing her bachelor’s degree with a thesis in assessing the geothermal prospect of Galunggung, she has been more involved in several geothermal projects such as the ones located in Sembalun, Sokoria, and Kamojang, both in the exploration and development phase.

OUR EXPERTS

Geoenergis assists companies and the government to identify the available options and factors that is necessary to be considered during planning and aim to develop the best solution in the decision-making process. The independent consultancy is conducted by experts with strong scientific and academic credential, combined with vast project experiences in the energy sector.

Our Consultants come from various backgrounds and expertise, with various level of experience.

TEAM OF EXPERTS