|Publisher||Offshore Technology Conference||Language||English|
|Content Type||Conference Paper|
|Title||MALVINAS BASIN - OFFSHORE ARGENTINA|
|Authors||Mateo A. Turic, Enrique Mainardi, Stanley Hogg, and Rodolfo Stubelj, YPF|
Offshore Technology Conference, 5-8 May 1980, Houston, Texas
|Copyright||1980. Offshore Technology Conference|
Within the South Atlantic waters adyacent to the Malvinas islands and the Argentine mainland there are three sedimentary basins with potential major hydrocarbon resources; the Magallanes, Malvinas, and Malvinas rise. The Magallanes basin an offshore extension of the producing areas in Chile and Tierra del Fuego lies entirely in water less than 300 feet. The assesment of undiscovered hydrocarbon for this offshore portion is at least equivalent to that already found onshore. East of the Rio Chico or Dungeness arch between the Malvinas islands and the mainland lies the Malvinas basin. YPF the Argentine state oil company has run more than 16.000 km of seismic reflection lines which have provided a fairly detailed knowledge of the structural configuration and basin evolution. Three distinct tectonic environments are present, a platform area with a sedimentary section up to 4.000 m thick, a transitional hinge zone and a deep trough parallel to the Andean belt.
The hydrocarbon potential of the sedimentary sequence composed of marine Tertiary and Cretaceous is now being tested by the Ciclon wildcat the first offshore well drilled in these waters.
The purpose of this paper is to give a broad outline of the structure and stratigraphy of the Malvinas basin in southern Argentina where YPF the Argentine Government Oil Company is now drilling Ciclon x-1 the first offshore exploratory well. We shall highlight here some of the more recent information available, particularly from this wildcat. Much of this, however, will be necessarily of a preliminary nature as many of the paleontologic and geochemical studies are still being completed.
The western portion of this basin has a fairly detailed seismic coverage some of it on a 5× 3 km grid. On the other hand the areas adjacent to the Malvinas islands in water depths greater than 200 meters have only some w1dely spaced regional reconnaissance lines. This seismic data has provided a good control of the regional tectonic framework, the basin boundaries and its total sedimentary fill. This is not the case for the stragraphy because the lack of exploratory drilling offshore requires us to correlate the seismic sequences here with those of the Magallanes basin to the west.
In certain aspects both areas have shared a common sediment history. The main difference is in their early depositional sequences and latter tectonic evolution, Magallanes is a typical as symetric basin related to plate subduction along its Pacific margin; Malvinas on the other hand could have its origin as an initial stage of pull apart related to the opening of the Atlantic. As a result the basal section in Malvinas could be older than those deposited in the platform area of the Magallanes basin.
The present day structural configuration of the basin can be seen in fig. 1; the Rio Chico or Dungeness high, separates it from the Magallanes basin, the northern and eastern boundaries are less precisely defined; partly because lack of seismic control; the Malvinas high an area of Paleozoic basement with the Mesozoic section missing limits this portion of the basin.
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