Journal of Petroleum Geology, Vol.6, No.2, pp.139-164, 1983

©Copyright 2000 Scientific Press, Ltd.

GEOLOGY AND ENTRAPMENT HISTORY OF THE
PORTACHUELO SALINA POOL, TALARA BASIN, PERU

H. Hay-Roe*, J. F. Zuniga**, and A. Montoya***

*Consultant, Kingwood, Texas.

**World Bank, Washington, D.C.

***Petróleos del Peru, Lima, Peru.

Abstract

Maps of pressure measurements and fluid distribution are important tools in deciphering the geology of complex reservoirs. To understand the original entrapment and present-day distribution of hydrocarbons in the Salina Pool of Portachuelo Field, NW Peru, we used pressure and production data, in conjunction with a detailed analysis of how the pool is put together structurally and stratigraphically. In Portachuelo up to 45 Lower Eocene (Salina) sands, which can be oil-, gas-, or water-bearing in different wells, have been offset by a veritable maze of normal faults. To reconstruct this jig-saw puzzle we used "composite" electric logs that provided a close approximation of the Salina sequence prior to faulting.