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EXPLORATION |
Geologically, the JDA lies in the northern part of the prolific Malay Basin where thick sediments of Tertiary sandstones, siltstones and shales are abundant which provide source as well as reservoir for oil and gas.
Prior to the signing of the MOU in 1979, a Contractor from Malaysia had drilled one well, the Pilong-1, in 1971 and discovered gas. This area was then relinquished. In the neighbouring area, a concessionaire from Thailand had also drilled one well, the 17-B-1 in 1976 and discovered gas. After the physical formation of MTJA Office and Management in 1992 and the award of production sharing contracts in April 1994, the MTJA's Contractors/Operators have made significant progress in carrying out the petroleum exploration in their respective contract areas (Block A-18 and Blocks B-17 & C-19). |
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Since the signing of the PSCs in April 1994, a total of 5,800 line km of 2D seismic data and 2,366 square km (1,200 sq.km. from Western Flank in mid 2005) of 3D seismic data was acquired and interpreted by CTOC in Block A-18. CPOC acquired a total of 6,100 lines km of 2D seismic data and 1,938 square km of 3D seismic data in Blocks B-17 & C-19.
In year 2006 to 2007, CPOC acquired a total of 1,154 square km of 3D seismic data in Block B-17-01. Carigali Hess acquired a total of 1,560 square km of seismic data over the Carigali Hess and CSM combined full fold area in 2006.
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3D seismic in the
JDA
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Exploration period for Blocks A-18, B-17 and C-19 has expired since 20 April 2002. Current contractors retain the Gas Holding Areas (GHA) in these blocks.
Those areas that were relinquished to MTJA have been merged as a new block in the JDA with an area of approximately 3,475 square kilometers (refer to the map below).
The Production Sharing Contract (PSC) for new Block B-17-01 was signed between MTJA and Contractors on 30 September 2004 for the right to explore and exploit petroleum in the JDA. As of the end of 2009, 7 exploration wells were drilled.
2D seismic in the JDA
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From 1994 to 2009, a total of sixty-three (63) exploration and appraisal wells were drilled in the JDA: with thirty-seven (37) wells in Block A-18, and twenty-six (26) wells in Block B-17 and B-17-01.
Twenty-five (25) gas fields were declared in the JDA; 9 fields in Block A-18, namely, Cakerawala, Bulan, Suriya, Bumi, Bumi East, Senja, Samudra, Wira, and Samudra North; 9 fields in Block B-17, namely, Muda, Tapi, Jengka, Amarit, Mali, Jengka South, Jengka West, Jengka East and Muda South; and 7 fields in Block B-17-01, Tanjung, Jinda, Andalas, Muda South East, Andalas East, Thanthong and Melati. Some of these fields also have minor oil accumulations.
Todate, there are total of 114 development wells were drilled in JDA with 71 wells in Block A-18 and 43 wells in Block B-17.
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As of the end of 2009, approximately 8.6 Trillion Standard Cubic Feet of 2P gas reserves (Proved + Probable), exclusive of CO2, from twenty-five (25) fields have been discovered, there are 116 million barrels of 2P condensate and approximately 22 million barrels of 2P oil reserves in the JDA.
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