gas hydrate - CCOP

Table-1. Summary of CBM reservoir properties and estimated CBM resources
(Stevens, 2006)
Basin Province Target Completeable Coal Avg High- CBM Resources
Form- Coal Rank Depth Graded Complet- Concenation
Thickness Area able tration
(m) (R o %) (m) (km 2 ) (Tcf) (Bcf/mi 2 )
1 S. Sumatra Sumatra M.Enim 37 0.47 762 7,350 183.0 24.9
2 Barito Kalimantan Warukin 28 0.45 915 6,330 101.6 16.0
3 Kutei Kalimantan Prangat 21 0.50 915 6,100 80.4 13.2
4 C. Sumatra Sumatra Petani 15 0.40 762 5,150 52.5 10.2
5 N. Tarakan Kalimantan Tabul 15 0.45 701 2,734 17.5 6.4
6 Berau Kalimantan Latih 24 0.45 671 780 8.4 10.8
7 Ombilin Sumatra Sawaht 24 0.80 762 47 0.5 10.7
8 Pasir/Asem Kalimantan Warukin 15 0.45 701 385 3.0 7.9
9 NW Java Java T. Akar 6 0.70 1524 100 0.8 7.6
10 Sulawesi Sulawesi Toraja 6 0.55 610 500 2.0 4.0
11 Bengkulu Sumatra Lemau 12 0.40 610 772 3.6 4.7
Total 30,248 453.3 15.0
The potential CBM resources in Indonesia (Stevens, 2006) were summarized in the following
paragraphs.
The South Sumatra Basin appears to be the most prospective for CBM development. The
preliminary prediction suggests that recoverable CBM resources in the South Sumatra Basin
at target depths of 300-1,000 m are estimated at 183 Tcf, accounting for 40% of the total
national resources. The Muara Enim Formation, as a target formation, contains a thickness of
37 m of high vitrinite sub-bituminous coal with extremely low ash content. Furthermore, the
South Sumatera basin, as a petroleum producing basin, has much data relevant to operational
logistics and gas markets.
The Central Sumatera Basin has an estimated recoverable CBM source of 53 Tcf at an
average target depth of 762 m. The target formation for CBM development is the Upper
Petani Formation. This formation contains a thickness of 15 m of lignite to sub bituminous
coal with 10% ash and 2% CO 2 contents. The Central Sumatera basin is a significant
petroleum producing basin. Gas markets and operational logistics are well established.
TheBarito basin is also prospective for CBM development. The CBM resource at a target
depth of approximately 800 m is estimated at 102 Tcf and represents the 2 nd largest CBM
resource in Indonesia. The target formation for CBM development in the Barito basin is the
Warukin Formation. This formation contains a thickness of 28 m of sub-bituminous coal with
low ash and CO 2 contents. The Barito basin is not a significant petroleum producing basin and
data concerning operational logistics and gas markets are therefore inferior to those in South
Sumatera.
The Kutai basin has an estimated CBM resource of 80.4 Tcf at a target depth of approximately
900 m. This basin contains 2 primary target formations for CBM development, the Kamboja
and Prangat Formations of the Balikpapan Group which has 21 m of bituminous coal
thickness with low ash and CO 2 contents. As a major oil and gas producing basin, the Kutai
Basin has established gas markets and operational logistics.
New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane 145