RE: Production update28 Mar 2018 23:50
3rd time lucky - maybe.
Emily,
The Maturin Basin of eastern Venezuela, including Trinidad. has produced approximately 9.5 billion brls of oil, and is the site of significant new discoveries at El Furrial and El Carito. The present structural basin was formed by oblique compression during Oligocene to Miocene time, with the northem flank being a folded and thrusted terrane over-riding the South American continental margin. This deformed northern flank extends into the subsurface to the basin axis, and includes the southern half of the onshore and offshore territory of the Republic of Trinidad and Tobago. The basin was infilled from west to east by deep-marine shales, turbidites, pelagic oozes and deltaic sediments of Neogene age. Deltaic sands form the reservoirs of all the important oilfields in the basin. Oil occurrence on the northern flank of the basin is associated with thrust-related structures in Venezuela and wrench-related structures in Trinidad.
There are many excellent prospects along the flanks of wrench-related ridges with diapiric cores in the Trinidad and Tobago portion of the basin. Late Pliocene and Pleistocene deltaic sands shale-out northwards in very thick aggradational lobes, enhancing the prospectivity of the southern flanks of these ridges. The prospectivity of the fold-and-thrust belt in Trinidad and Tobago is limited by the distribution of reservoir facies in pre-Pliocene sediments. Candidates for non-deltaic reservoirs are Miocene limestones, Oligocene sheet-sands, Eocene turbidites and Cretaceous fractured argillites.
In 1954, Apex drilled Well 560 to test the Oligocene. This is the deepest well ever drilled onshore in Trinidad, reaching a total depth of 16,155 feet. Some 30 feet of oil pay was found in the Cruse formation (at a much higher level) but drilling was stopped on reaching the Oligocene due to the presence of water.
I'm not saying that the SWP is not going to yield any significant oil at depth as we shall just have to wait for the results of any future drilling. But Well 560 demonstrates that there is a possibility of similar results to those found at Fyzabad in which case any finds would most likely be in the shallower Cruse and not the gusher that everyone hopes for. Offshore presents better prospects in my opinion but let's wait and see.