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CHANCO FORMATION, A POTENTIAL CRETACEOUS RESERVOIR, CENTRAL CHILE

1983; Wiley; Volume: 6; Issue: 1 Linguagem: Inglês

10.1111/j.1747-5457.1983.tb00265.x

1747-5457

Giovanni Cecioni,

Geological Studies and Exploration

The Chanco embayment lies 300 km SSW of Santiago, Chile. The sequence within this basin above the metamorphic basement is: Chanco Formation (very clean sandstone), Quiriquina Formation (glauconitic sancistone, rich in organic matter), and Navidad Group (a very good caprock). This section thus contains reservoir, source and caprocks, and is therefore very promising for petroleum investigations. The offshore C‐1 well yielded salt‐water with gas shows, andtwo wells drilled onshore yielded flows of gas. The C‐1 well lies on a gently‐dipping EW‐striking anticlinal structure, the presence of which makes the area very prospective.