san isidro prospect

I suggest people take into the consideration ALL INFORMTATION when posting.

See below FROM East Visayan Basin:
DOE awarded GSEC 93 to an all Filipino consortium in February 1998
AGRC with 46.60% participating interest is the administrative operator
Trans-Asia with 33.34% is the technical operator
AGRC, PetroEnergy and Trans-Asia composed the consortium
Probable oil reserves: 30M barrels to a high of 80M barrels of oil.


The contract area is located in the central part of the Philippine Archipelago, bounded by the islands of Cebu, Leyte and Bohol. It covers 14,000 square kilometers, making it the biggest contract area in the Philippines. It also has the most number of hydrocarbon seeps and shows in the entire country .


The GSEC 93 consortium lead by Alcorn Gold focused its exploration thrust on the onshore part of the concession area. Oil has been detected on the rock samples collected from the contract area while an old asphalt mine exists in the nearby town of Villaba. Previous wells drilled in the area detected the presence of gas and oil of sub-economic quantity, presumably because they have not been ideally located.


Previously completed work programs delineated several drillable targets. The San Isidro prospect was selected because it has the best-defined onshore structure based on integrated seismic, aeromagnetic and gravity data. It was decided that drilling a slim stratigraphic hole would be the best option to test the presence of gas and/or oil in the San Isidro structure.


Over a span of eighteen months from May 2000, two core-drilling outfits were contracted to attempt and penetrate the San Isidro structure. Both attempts were unsuccessful to reach the target depth of 1,030 meters, and their best efforts were hampered either by financial or technical deficiencies. Swelling clays and over-pressured aquifers prevented both attempts from drilling beyond 305 meters.


These technical deficiencies on the part of the drilling contractors caused undue project delays. The consortium is now reviewing its options on how to complete the project.

IT seems these attempts were underfinanced and drilling a slim stratigraphic hole was folly.

Otto's latest report gives a better insight;

A region in the south central SC69 area comprises an intra-basin ridge with a likely core of early Tertiary or older rocks.
The bordering troughs appear to be synrift in character that may be filled with Oligocene to Early Miocene clastic and
coal measure deposits. These sediments have been encountered in outcrop and offset boreholes and are suitable
source rocks. In SC69 these sequences are likely to be buried in troughs to q y g depths suitable for hydrocarbon generation
and expulsion. The asymmetry to these kitchens provides clear migration routes into the carbonate highs.
SC 69
Marls, lime muds &
calcilutite
Reef & platform limestones
Igneous, metasedimentary &
volcanic basement (pre-
Tertiary)
Sands and muds in
tidal, shoreface and
coal measure facies
Clays and
interbedded muds
& silts
Composite seismic line depicting a central high with reef development
Mature Kitchen Mature Kitchen
Calagmangan Trough Pacijan Trough
Potential sandstone and limestone reservoirs have been identified across the Visayan region. Ottos recent seismic
mapping studies on the distribution and quality of reservoir units, and the definition of kitchen areas and migration routes
has enhanced the potential for clastic and carbonate reservoir plays associated with extensional and inversion
structures.

Looks good to me! IMO DYOR