The three fields operated by PDN are the Los Angeles and Santa Lucia fields in the Tisquirama A and B licences and the Doña Maria field in the Lebrija licence. PDN's working interests in these fields are 50%, 25% and 100% respectively. All these fields produce oil from Upper Cretaceous and Tertiary Sandstones at depths ranging from 5,900' to 8,500'.
The Los Angeles field was discovered by Texaco in 1985 and came on-stream in 1987. Ten wells have been drilled on the structure, of which six are currently producing a total average of 526 bopd (383 bopd net). The main reservoir is the Basal Lisama Sandstone Formation which produces 12.9 to 13.4º API oil from good quality sandstones (porosity 17 to 25%, permeability up to 1,500 mD). At least four additional drilling locations have been identified. There are secondary reservoirs in the Upper Lisama and Umir Formations, and PetroLatina has recognised additional potential in the underlying Cretaceous fractured carbonates. An independent reservoir study has estimated remaining proven reserves of approximately 3.7 million barrels gross (1.8 million barrels net) and a further 1 million barrels (0.5 million net) of probable reserves.
The Santa Lucia field came on-steam in 1993. Three wells have been drilled on the structure and are currently producing a daily average of 415 bopd (104 bopd net). The main reservoir is the Basal La Paz Formation at approximately 8,500' depth. Oil gravity is 18º API. Proven reserves have been estimated at over 2.5 million barrels gross (0.65 million barrels net) and probable reserves are approximately 15 million barrels gross (approximately 3.75 million barrels net). There is, therefore, significant upside potential in the field. Additional structures have been mapped along strike but further work is required on these before they are ready to drill.
The Doña Maria field is a small accumulation producing oil in two wells from a 20' thick sandstone in the Lisama Formation at a depth of approximately 6,300'. Current daily average production from these two wells is 36 bopd (36 bopd net). Proven reserves are estimated to be 266,000 barrels.
Serafin Gas Development
The Serafin gas accumulation lies to the north of the Los Angeles field in the Tisquirama “B” section of the Tisquirama licence and was discovered in the early 1990’s. It tested at flow rates of up to 16 million cubic feet of gas per day but was suspended as there was no market for the gas and there was no gas pipeline nearby.
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