Santiago Basin Petroleum Systems The Santiago Basin is an elongate, NNE-SSW trending tectonic basin, 200 km long and 100 km wide, covering about 40 million acres and is part of the Sub-Andean fold thrust belt (PARSEP, 2001). The basin lies at the western edge of the Marañon Basin and was continuous with the Marañon prior to the Late Tertiary Andean Orogeny. A N-S trending tectonic uplift, the Manseriche/Campanquiz Mountains, separates the two basins. The pre-Cambrian/Igneous Condor Cordillera bounds the basin on the north and west and the southern boundary is formed by the E-W trending Huancabamba Deflection. The NNE-SSW trending uplifted belts provide Cretaceous to Tertiary stratigraphic sections from which source rock samples were collected and analyzed (Brand et. al., 1985; Brand and Sweeney, 1985 and Core Lab, 1996). Mature Cretaceous Chonta source rock sections and low maturity, oil-prone Tertiary source beds of the Pozo Formation were identified in these studies. The main topographic feature of the present-day basin is the NNE-SSW trending Santiago/Nieva Tectonic Depression that is bordered by the uplifted belts. All exploratory activity has been in the southern 150 km of this depression, while the northern 90 km section remains unexplored at this writing. Over 20 oil seeps have been identified in the depression, indicating the existence of a petroleum system(s). The PARSEP (2001) report discusses the exploratory work in the basin, which is summarized, below. The data cited by PARSEP (2001) for the Santiago Basin was supplied by Perupetro; these include 1566 km of 2D seismic collected as part of exploration activities in the 1960’s through 1996. The basin is covered by a 19,150 km2 aerogravity/magnetic survey performed by Carson Geophysical for Quintana Minerals Corporation (QMC) Sucursal Peruana in 1997. |
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Seven exploratory wells have been drilled starting with three wells in the 1960’s: Dominguza-1X, Piuntza-1X, and Putuime-1X. In the 1970’s and 1980’s, Petroperu conducted field studies and acquired seismic and gravity data. Petromineros del Peru conducted exploration studies in the 1990’s. In 1995, QMC entered a contract with Perupetro to explore Block 50. Following their exploratory analysis, QMC and several partners drilled four exploratory wells in 1996 through 1998: Caterpiza-1X, Pupuntas-1X, Manseriche-1X and Tanguintza-1X. All 7 wells had oil and or gas shows but were completed as dry holes, and presently there is no production in the Santiago Basin. The location of the seven wells, seismic lines acquired from the 1970s through the 1990s, and a composite seismic line prepared by PARSEP (2001) are shown in Figure 1.4. Well summaries listing the depths and quality of gas and oil shows are provided in the PARSEP (2001) report together with composite seismic lines. There is no charge for this report. |
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Download Montage: 1 Contact Rick Schrynemeeckers, Managing Director: Call: 1-281-681-8811 |
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