CAMBODIA KHMER BASIN DEVELOPMENT MECHANISME AND ITS IMPLICATION TO HYDROCARBON EXPLORATION

• Main Author: Triany, Novi
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/73609
• Institution: Institut Teknologi Bandung

Khmer Basin is located on the offshore of Cambodia. The basin has a very complex structural setting; however, the basin is potentially high for hydrocarbon generation. A large number of subsurface data acquisitions have been completed; those are 2D seismic and several drilling. Eight wells were drilled and five of them are proven to have hydrocarbon content. The hydrocarbon discovery represents Khmer Basin as an excellent area for exploration. Unfortunately, detailed discussion regarding the Khmer Basin for further hydrocarbon exploration and exploitation was still on debate these days. The discussion includes questions regarding the successful and failure of hydrocarbon discovery on a drilling program in the Khmer area. The research area covers the Khmer Basin and eastern Khmer ridge. Two dimensional subsurface and drilling data are used to explain the basin development mechanism and its implication on hydrocarbon exploration. Research phase includes the regional and tectonic study; determine structural pattern, stratigraphical layer and sedimentation distribution on every sequence by creating depth structure map and isopach, cross section reconstruction and basin modeling. By studying the thickening and thinning sequence from the isopach map and seismic analysis and flattening then the basin geometry and the existence of structural influence can be describe. Afterward, the regional regime affecting the research area will easily be recognized. Khmer Basin is a Tertiary Basin. Ten horizons were interpreted on the seismic data. Structural pattern on the research area is mostly on north-south trending, produced from an extensional regime as the aftermath of a pull-apart influence by strike-slip movement. Basin evolution was marked by several stages; they are pre-rift (basement interval or S-0), syn-rift (S I and S II interval), and post-rift (S III, S IV, S V, S VI, S VII, S VIII, and S IX). Based on well drilling and seismic interpretation, hydrocarbon potential such as the source rock identification, reservoir, closure and trap were recognize. From the cross section reconstruction and basin modeling analysis, hydrocarbon accumulations were affected by hydrocarbon migration and structural development (hydrocarbon trap).