Reservoir modeling in the Bunyu Tapa Gas Field - an integrated case study

Conference · Fri Jul 01 00:00:00 EDT 1994 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7015792

Nugroho, S ^[1]; Hansen, S; Susanto, M ^[2]

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1. Pertamina Unit IV, Balikpapan (Indonesia)
2. Schlumberger, Balikpapan (Indonesia)

Bunya Tapa gas field is located on the western edge of Bunyu Island, approximately 12 km northwest of Bunyu Nibung oil field; it is the main gas producer for the Bunyu methanol plant. Initially, the Bunyu Tapa sands were believed to be deposited as a blanket-type sheet sand, but after drilling 21 wells in this field, it is obvious that these sands lack lateral continuity. The Bunyu Tapa reservoir sands were deposited in a deltaic environment. Several wells, which were producing gas close to the structurally high western edge of this field, are exhibiting a high-water cut. This water production is not expected in a deltaic lens environment, especially since these wells are updip to other gas-producing wells. This Bunyu Tapa reservoir modeling study is an integrated investigation of 2-D seismic data, electric logs, dipmeter, petrophysical analysis, and production history data. The results of this integrated study show that the sands were deposited as distributary channel sands across the field and extend offshore. Structurally, the wells on the western edge are in fact on the eastern flank of a north-south-trending anticline, close to the gas/water contact and are separated from the eastern wells by north-south-trending normal faults. In the near future, as a result of this study, a deviated well is planned to evaluate the offshore area to the west.

• OSTI ID: 7015792
• Report Number(s): CONF-940803-; CODEN: AABUD2
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 78:7; Conference: American Association of Petroleum Geologists (AAPG) international conference and exhibition, Kuala Lumpur (Malaysia), 21-24 Aug 1994; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
INDONESIA
NATURAL GAS DEPOSITS
GEOLOGIC MODELS
DIPMETER LOGGING
RESERVOIR ROCK
SANDSTONES
SEISMIC SURVEYS
ASIA
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
ISLANDS
MINERAL RESOURCES
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SURVEYS
WELL LOGGING
030200* - Natural Gas- Reserves
Geology
& Exploration