Geology and Petrophysics of a Reservoir from Cañón Field, Burgos Basin, México

Hugo A. Torres, Heriberto C. Aguayo, Victor M. Alvarez, and Maya y Manual Morales Leal
Pemex Exploraciòn y Producciòn, PEMEX, Reynosa, Mexico

In the last years the Burgos basin has become one of the most important non-associated gas producer basin of Mexico.

The present work shows the geologic and petrophysics study of a gas reservoir of the Cañón field, which is located in the eastern portion of the Burgos basin. The study was born of the necessity to integrate the data collected during the drilling and completion stages, and to detail with better precision the characteristics of the reservoir.

The Cañón field was discovered in the 60 years, with the drilling of the Cañón 1 well. The field is made up of 6 wells (5 producers and 1 unproductive).

The Cañón field was reactived with the wells Bazuka 1 and Cañón 8 in 2000 and 2001 respectively. More than 100 wells have been drilled in the field so far; 93 are producers, most of them crossed this sand and 40 of them have produced gas in this reservoir, and some workovers are left.

This reservoir has a net thickness between 15 and 70 meters; it is located in siliciclastics sediments of Oligocene, in the Vicksburg formation. These sands have good porosity "ø" (between 14 and 18 %) and permeability "k" (between 0,1 to 5 Md), both calibrated with core analysis.

Their sedimentary environment, rock types and petrophysical properties are described here, as they are: reservoir quality index, flow units, R35 and FZ1 (using Windland and modified Lorenz plots), salinity (NaCl) and Rw, electrical properties (a, m and n) and mineralogy, all of this using core analysis (conventional and sidewall), crossplots, petrography and scanning electronic microscope (SEM) images and some special logs ran in the area (elemental capture spectroscopy ECS, compensated spectral natural gamma ray CSNG and magnetic resonance).

This reservoir has produced gas and condensate with initial flow rates from 1 to 7 MMscfd, initial wellhead flowing pressures

AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas