Subsequently, with technical and financial assistance from the United Nations Development Programme (UNDP), around 26 square kilometers were divided into 3 blocks, and a total of 14 gas wells were drilled on various dates. According to the studies, tests, and exploration reports conducted in different phases, the findings include:
Gas Porosity: 35%
Gas-Water Ratio (0.4): 1:2.5
Reserve Thickness: 85 meters
Gas Reserve:
Block A: 47.6 million cubic meters (Proven)
Block B: 170 million cubic meters (Probable)
Block C: 100.8 million cubic meters (Probable)
The places and dates of gas well drilling conducted under this project are as follows:
Well No. | Location | Depth (m) | Drilling Year (BS/AD) | Block |
1 | Department of Industry Premises, Tripureshwor, Kathmandu | 305 | 2037/38 (1980/81) | A |
2 | Pachali, Teku, Kathmandu | 301, 350 | 2039/40, 2073/74 (1982/83, 2016/17) | A |
3 | Waste Management Premises, Kuleshwor, Kathmandu | 302 | 2039/40 (1982/83) | A |
4 | Hyumat, Kalimati, Kathmandu | 300 | 2042/43 (1985/86) | A |
5 | Hyumat, Kalimati, Kathmandu | 454.4 | 2042/43 (1985/86) | A |
6 | Bhrikutimandap, Kathmandu | 570.13 | 2044/45 (1987/88) | A |
7 | Teku Dobhan, Kathmandu | 358.8 | 2044/45 (1987/88) | A |
8 | Shankhamul, Kathmandu | 455.31 | 2045/46 (1988/89) | B |
9 | Koteshwor Mahadevsthan, Kathmandu | 300 | 2047/48 (1990/91) | B |
10 | Koteshwor Tinkune, Kathmandu | 300 | 2048/49 (1991/92) | B |
11 | Koteshwor Jadibuti, Kathmandu | 300 | 2048/49 (1991/92) | B |
12 | Tikathali, Lalitpur | 300 | 2049/50 (1992/93) | C |
13 | Balkumari, Lalitpur | 300 | 2049/50 (1992/93) | C |
14 | Imadol, Lalitpur | 300, 350 | 2049/50, 2071/72 (1992/93, 2014/15) | C |
Gas Reserve Estimate:
o Gas prospective zone = 26sq. km.o Average gas reservoir thickness = 85mo Porosity = 35%o Gas water ratio = 0.4o Total gas reserve = 26000000*85*0.35*0.4 = 300 million cubic meter
The reserve estimation for three blocks is as follows:
Parameter | Block A (Teku–Tripureshwor) | Block B (Koteshwor–Tinkune) | Block C (Manahara–Imadol) |
Prospective Area | 4 sq. km | 14 sq. km | 8 sq. km |
Porosity | 35% | 35% | 35% |
Gas-Water Ratio | 0.4 | 0.4 | 0.4 |
Reserve Thickness | 85 m | 85 m | 85 m |
Gas Reserve | 4,000,000 × 85 × 0.35 × 0.4 = 47.6 million m³ (Proved) | 14,000,000 × 85 × 0.35 × 0.4 = 170 million m³ (Possible) | 8,000,000 × 85 × 0.35 × 0.4 = 100.8 million m³ (Possible) |
Gas Distribution
Around the year 1983, with the support of JICA, a gas bullet with a capacity of 500 cubic meters was constructed in Teku, Pachali of Block A as a trial. Gas from Well No. 1, 2, and 3 was stored in the bullet through a pipeline system and distributed via pipelines to nearby government offices and hospitals for several years.
The brief description of those boreholes is as follows:
DMG Well No.1: Cottage Industry Office, Tripureswor
Elevation of Top of the Wall-1284.39 m; Drilled Depth-305 m; Thick clay > 25 m above screen zone 10 to 189 m; Aquifer tapped -188 to 297 m, 5 places, 85 m; Specific capacity 146 to 200 cum/day/m2
DMG Well No.2: Model Gas Plant Premises, Teku
Elevation of Top of the Wall-1281.93 m; Drilled Depth -301 m; Thick clay > 25 m above screen zone 1.5 to 42, 44 to 69, 99 to 140 and 145-183 m; aquifer tapped-190 to 296 m, 4 places, 83 m; Specific capacity-6 to 77 cum/day/m2
DMG Well No.3: Teku KMC, Kathmandu
Elevation of Top of the Wall-1279.0 m; Drilled Depth-302 m; Thick clay > 25 m above screen zone -none; aquifer tapped-170 to 297 m, 6 places, 101 m; Specific capacity-60 to 150 cum/day/m2.
DMG Well No.4: Hyumat Tole, Left bank of the Bisnumati River
Elevation of Top of the Wall-185.6 m; Drilled Depth-300 m; Thick clay > 25 m above screen zone -0 to 197; aquifer tapped-190 to 299 m, 6 places, 65 m; Specific capacity-10 to 43 cum/day/m2.
DMG Well No.5: Hyumat Tole, Left bank of the Bisnumati River
Elevation of Top of the Wall-1285.66 m; Drilled Depth-450 m; Thick clay > 25 m above screen zone -0 to 198; aquifer tapped-298 to 450 m, 4 places, 133 m; Specific capacity-9 to 20 cum/day/m2.
DMG Well No.6: Bhrikuti Mandap
Elevation of Top of the Wall-1293.5 m; Drilled Depth-577 m; Thick clay > 25 m above screen zone -20 to 173; aquifer tapped 176 to 550 m, 11 places, 214 m; Specific capacity 18 to 137 cum/day/m2, water level- 6 m above the ground surface, Weathered rock-549 to 570 m and Bed rock 570 to 577 m.
DMG Well No.7: Teku
Elevation of Top of the Wall-1278.18 m; Drilled Depth-359 m; Thick clay > 25 m above screen zone -14 to 74, 80 to 185; aquifer tapped-187 to 340 m, 5 places, 119 m; Specific capacity-9 to 20 cum/day/m2, Weathered rock-346 m and Bed rock 355 to 359 m.
DMG Well No.8: Sankhamul
Elevation of Top of the Wall-1284.55 m; Drilled Depth-455 m; Thick clay > 25 m above screen zone-23 to 182; aquifer tapped-183 to 438 m, 3 places, 414 m; Specific capacity-46cum/day/m2.
DMG Well No.9: Koteshwor
Elevation of Top of the Wall-1298.55 m; Drilled Depth -300 m; Thick clay > 25 m above screen zone -none; aquifer tapped-90 to 288 m, 14 places, 116 m.
DMG Well No.10: Tinkune
Elevation of Top of the Wall-1291.80 m; Drilled Depth-300 m; Thick clay > 25 m above screen zone-32 to 106; aquifer tapped-110 to 295 m, 11 places, 99 m; water level-0.28 m above ground surface ; discharge-118 l/min.
DMG Well No.11: Herb Production and Processing Ltd., Manohara
Elevation of Top of the Wall-1294.68 m; Drilled Depth-300 m; Thick clay > 25 m above screen zone 12 to 161; aquifer tapped-124 to 289 m, 11 places, 89 m; water level- 4.77 m above ground surface ; discharge-110 l/min; Transmisivity-3215 sq.m./day; Storage Coefficient -0.000139
DMG Well No.12: Tikathali, Lalitpur
Elevation of Top of the Wall-1300.75 m; Drilled Depth 301 m; Thick clay > 25 m above screen zone 55 to 120; aquifer tapped-159 to 292 m, 7 places, 94 m; water level-11.77 m above ground surface ; Drawdown-12.45 m, Discharge- 120 l/min.
DMG Well No.13: Balkumari, Lalitpur
Elevation of Top of the Wall-1287.72 m; Drilled Depth-300 m; Thick clay > 25 m above screen zone-89 to 152; aquifer tapped-163 to 268 m, 6 places, 70 m; water level- 1.9 m above ground surface; Drawdown-25 m, discharge-400 l/min.
DMG Well No.14: Imadole, Lalitpur
Elevation of Top of the Wall-1290.98 m; Drilled Depth-300 m; Thick clay > 25 m above screen zone -0 to 157; aquifer tapped-113 to 290 m, 7 places, 90 m; water level-2.06 m above ground surface: Drawdown-21 m, Discharge-336 l/min.
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