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Identification and Characteristics of Tight Oil & Gas Reservoirs; Central Portion of the Chicontepec FormationGold Open Access

Authors: H. Avalos Torres and J. Aguayo-Camargo
Event name: First EAGE/AMGP/AMGE Latin-American Seminar in Unconventional Resources
Session: Understanding Geological Risk And Uncertainties On Unconventional Plays II
Publication date: 23 November 2017
DOI: 10.3997/2214-4609.201702655
Organisations: EAGE
Language: English
Info: Abstract, PDF ( 3.82Mb )

Summary:
Unconventional resources are important for exploration and production in Mexico. The Formation Chicontepec is considered unconventional tight oil & gas reservoirs. The tight reservoirs (TR) are called like that for their low permeability and porosity by petroleum and petrophysical field. This paper provide a research about concepts, classification, physical properties and petrophysical characteristics of TR, Identification of TR with cores and well logs, geological occurrence and sedimentary characteristics of unconventional tight reservoir in Mexico. Tight oil must not be confused with shale oil & gas, because they varied through API gravity, viscosity of fluids, extraction method and other aspects. Reservoirs connectivity is a modifying attribute, usually limited and discontinuous; for these reason, the stratigraphic correlation is discontinuous, because its heterogeneity. The Production cost is closed to economic limit and sometimes is overtaked. Well electrical logs are limited by their vertical resolution in these reservoirs; the only exception is the micro-resistivity image log. In future studies, is appropriated use equations and inversion models of well logs focus on TR.

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