Innovation Technology Using Acoustic Impedance Modeling For Reservoir Characterization at Tanjung Oil Field, Barito Basin, South Kalimantan, Indonesia

Rusalida Raguwanti and Darwin Tangkalalo
Pertamina EP, Jakarta, Indonesia

Tanjung Field is Pertamina own operation area located to the north east of Barito basin, which is known as the largest basin in South Kalimantan. It was discovered in 1937 by successfully exploration well T-001. Recently, production performance is achieved up to 5200 BOPD from 86 production wells. The common problem in subsurface reservoir characterization in Tanjung Field is determining the lateral connectivity of sand distribution along the Tanjung structure.
When well to well correlation is not sufficient to overcome this difficulty, acoustic Impedance modeling is then approached to solve the reservoir problem. The use of inverted P-impedance data using Constrained Sparse Spike Inversion method can be used to recognize sand geometry, the different lithological bodies and the development of stratigraphic framework.
The non-unique solution extracted from stratigraphic slicer map over 3D cube with four millisecond interval for each layer give more detailed options to choose the best development well location. On the bases of analysis, combining seismic inversion modeling, well log correlation and petrophysical analysis provided a better understanding of the estimation of porosity and lithology distribution. Multi characterization sand for each layer can be distinguished by various range of acoustic impedance value. It is also controlled by facies changing within the deltaic setting.
As the implementation of innovation technology, integrating between inversion modeling and geological evaluation are found useful in terms of enhance the resolution and confident level to increase the production optimazion and development campaign

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece