GEOLOGICAL MODELING IN BERUK NORTH FIELD, COASTAL PLAINS PEKANBARU BLOCK, CENTRAL SUMATRA BASIN, INDONESIA

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32nd HAGI, The 36th IAGI, and The 29th IATMI Annual Conference and Exhibition

GEOLOGICAL MODELING IN BERUK NORTH FIELD, COASTAL
PLAINS PEKANBARU BLOCK, CENTRAL SUMATRA BASIN,
INDONESIA

Reza Satria N.1, Budi A.1, Doni H.1, Fadhli R.2

1Reservoir Management Team, 2Exploration Team,
Badan Operasi Bersama PT. Bumi Siak Pusako – Pertamina Hulu

ABSTRACT

Beruk North Field is located in the southern part of Coastal Plains Pekanbaru (CPP) Block. The first exploration well was drilled in 1985 and the field has been producing since 1988. It has four ways dip closures resulting from highly structural influence. The complex structural setting and less data availability added with the high decline rate above 16% in the early 2007 and the cumulative production by the end of 2006 is around 36 % of initial reserve, has challenge us to work on a better understanding of the reservoir for future development.

This study which objective is for reservoir simulation and field development forecast, combined all available data (geology, geophysics & petrophysics) into a representative 3D geo-model. Core data provide stratigraphic marker and various depositional facies. The heterogeneity gained from core collaborated with well logs using multimin petrophysical analysis and MRGC electrofacies method. Controlled with detail structural framework, those properties are then distributed across the reservoir using stochastic modeling techniques. Obtained detail facies properties, geometry and distribution reduces infill drilling risk, better reservoir management and gives more accurate reserve calculation.

This innovation of good interpretation and the usage of high technology have overcome the less data problem and have successful in building an integrated 3D geological model of Beruk North field. Our understanding of connectivity’s between facies and petrophysical properties combined with production actualization has helped us in developing the Beruk North Field into a more productive field. Our 3D model have been proven successfully with the drilling of several infill wells in Beruk North Field this year where they had rejoicing initial productions.

FURTHER EXPLORATION STRETAGY AT TAWAU GEOTHERMAL AREA, SABAH, MALAYSIA

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32nd HAGI, The 36th IAGI, and The 29th IATMI Annual Conference and Exhibition

FURTHER EXPLORATION STRETAGY AT TAWAU GEOTHERMAL AREA, SABAH, MALAYSIA

Takashima, I1., Sanudin, T2., Eddy Sucipta I G.B. 3, Irzal Nur4 and Myint Soe1

1Akita University, Akita 010-8502, Japan
2Univesiti Malaysia Sabah, 88999 Kota Kinabalu, Malaysia
3Institut Teknologi Bandung, Bandung 40132, Indonesia
4Hasanuddin University, Makassar 90245, Indonesia

ABSTRACT

Five geothermal fields are recognized in Tawau area, SW Sabah, Malaysia. Geothermal potential of the Tawau area is not clear but surface manifestation, heat discharge and existence of heat source young volcanoes lead us to next exploration step. First priority area is the Apas Kiri where the maximum temperature is 75.6oC with neutral pH (6.8) and total heat discharge is 29.4MWt. Another four geothermal areas scattered throughout the Maria volcanic region. Accordingly, identify the whole geothermal system is very important. One of the heat source rock is Maria volcano with the age range of 0.35-0.45Ma determined by recent thermoluminescence (TL) dating. However, details of volcano stratigraphy and magma-geothermal system model are not established. For further exploration, we propose following four techniques. First is Remote sensing. Second is detailed volcano-stratigraphic survey combined with shallow drilling. Third is precise petrology of volcanic rocks including chemistry of whole rock and minerals, geo-thermometric/barometric evaluation. Fourth is dating to identify both volcanic rocks and alteration products. Remote sensing include newly proposed spectral analyses by field digital spectrometer (camera). We plan to develop and use modified multi-band digital camera for field observation of outcrops.
It is possible to get two dimensional mineral distribution by precise spectral analysis. Shallow drilling is an introduction of recently developed portable machine and can get a grade up geological map. Magnetite-Illumenite analysis gives the precise magma temperature and oxygen fugacity. TL dating is the best way to evaluate age of geothermal activity. Following to the construction of precise geothermal model, geochemical and geophysical exploration must be carried out for suitable areas not limited thermal
manifestation areas.

SELF-POTENTIAL STUDY FOR LABORATORY MEASUREMENTS OF ELECTROKINETIC POTENTETIAL FROM FLUID FLOW IN POROUS MEDIA

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32nd HAGI, The 36th IAGI, and The 29th IATMI Annual Conference and Exhibition

SELF-POTENTIAL STUDY FOR LABORATORY MEASUREMENTS OF ELECTROKINETIC POTENTETIAL FROM FLUID FLOW IN POROUS MEDIA

Hamzah, M.1,2, Djoko, S.1, Wahyudi, W.P.1 , Sulistijo, B.3

1. Department Geophysics Engineering ITB.
2. Physics Department, Hasanuddin University
3. Department Mining Engineering ITB

ABSTRACT

Self-potential is potential difference of parameters generated by various of physical properties of subsurface. For example by fluid flow, salinity, hydrolic conductivity, pH, and temperature. This research is focused on self-potential study generated potential by electrokinetic. Electrokinetic potential can also be called streaming potential. Streaming potential are generated by fluid flow through porous media or fractures of rock. Therefore, elektrokinetic potentian can be use to fluid flow detecting and environment quantification. We have conducted an experiment fresh water fluid flow in celinder, which is in celider contain material porous. The material porous are made from various grain size. This experiment resulted electrokinetic coefficient (C ) of grain size respectively. The conductivity coefficient are computed by using Helmholtz-Smoluchowski equation. From eight samples determined the its conductivity electrohydraulic coefficient can be shown, the bigger grain size of sample, the bigger conductivity electrohydrolic coefficient obtained.