oa An Integrated Method for the Lithological Characterization of an Unconventional Oil Formation and its Impact on the Porous System

The concept of an unconventional reservoir proposes to change the perspective of the rock, not only as a generator, but also a reservoir rock, this makes to focus on important characteristics as porosity and diagenesis. The deposit models of carbonates lost definition in depth sea levels environments because of the minimum variation in their slope, however if it is possible to analyze in detail the allochemicals and orthochemicals components, the deposit environment could be interpreted. This interpretation gives the results of the impact of environment on rock texture, and how the texture improves or reduces porosity.

In order to determine the main lithologic characteristics and its relation with the porosity, were used 51 thin section, 15 sample with XRD-SEM-TOC acquired of 40 cores with a total of 27 wells at the study area. The description of the core samples were made megascopically to select systematically fragments that represent the main intervals in each core samples, and thus select samples for special studies and thin sections.

All the determinate characteristics are related to the data measured in well logs and are useful to determine best quality levels in the play.