Basin analysis in a Tertiary delta by numerical modeling: Mahakam case study (Indonesia)

Conference · Tue May 01 00:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:6762006

Burrus, J; Brosse, E ^[1]; Grosjean, Y; Choppin de Janvry, G; Oudin, J L ^[2]; Bessereau, G ^[1]

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1. Institut Francais du Petrole, Rueil Malmaison (France)
2. TOTAL, Ruiel Malmaison (France)

The evolution of the Mahakam delta is discussed on the basis of a quantitative reconstruction using the two-dimensional TEMISPACK software developed at Institut Francais du Petrole. The following steps are achieved. (1) An east-west 80-km-long regional seismic line tied on wells is used to establish a depth-section divided in 25 chronostratigraphic levels, and 40 vertical columns. Fifteen different lithologies are distinguished (between shales and sandstones, with variable total organic carbon), as interpreted from well data and seismic profiles. (2) Porosity-depth relations derived from log-data are used to backstrip the section and reconstruct the past geometries. The development of geopressures is investigated after calibration of the permeabilities on the observed lithologies. In particular, the authors account for the small-scale variations of the sandshale ratio by introducing a high anisotropy of the permeabilities. The model is shown to reproduce well observations such as depth at which geopressures appear, and gradient of pressure in the overpressured zone. The simulations show that the geopressures essentially are controlled by the distribution of the sandy layers, and are due to compaction disequilibrium (3) The generation of hydrocarbons simulated by a kinetic model and the migration (separate phase flow) of hydrocarbons is discussed. Boundary conditions and underconstrained parameters, such as capillary forces, past heat flow, etc., are discussed on the basis of a sensitivity analysis.

• OSTI ID: 6762006
• Report Number(s): CONF-900605-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 74:5; Conference: Annual convention and exposition of the American Association of Petroleum Geologists, San Francisco, CA (USA), 3-6 Jun 1990; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
58 GEOSCIENCES
INDONESIA
PETROLEUM DEPOSITS
SEDIMENTARY BASINS
EXPLORATION
ALLUVIAL DEPOSITS
COMPUTER CODES
GEOLOGIC MODELS
MATHEMATICAL MODELS
PERMEABILITY
POROSITY
RESERVOIR ROCK
SANDSTONES
SHALES
STRATIGRAPHY
ASIA
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOLOGY
ISLANDS
MINERAL RESOURCES
RESOURCES
ROCKS
SEDIMENTARY ROCKS
020200* - Petroleum- Reserves
Geology
& Exploration
580000 - Geosciences