Author: Maqsood AhmadPublisher:
ISBN:
Category : Shale gas reservoirs
Languages : en
Pages : 194
Book Description
Unconventional shale gas reservoirs are over-mature potential source rocks and possess commercial quantities of hydrocarbons in a mechanism which is different from conventional gas reservoirs. These organically rich shale rocks also known as continuous hydrocarbon reservoirs represent a voluminous, long-term, global source of thermo-genic methane and other hydrocarbon gases and could be referred to as shale gas. Roseneath and Murteree shale formations in Cooper Basin have been identified as potential shale gas reservoirs in South Australia. Core samples from these carbonaceous shales were selected for this study. Petrophysical and mineralogical characterization of shale gas reservoirs is still a challenge due to ultra-fine grained micro-fabric, micro level heterogeneity and anisotropic characteristics of these sedimentary rocks. Unlike conventional gas reservoirs, shale gas reservoirs have very low effective porosity and micro to nano-scale permeability. Conventional standards applications to characterize unconventional gas reservoirs give contradictory results about the mineralogy and rock characteristics, effective and total porosity as well as estimated brine saturation. These uncertainties in the results raised the question, which tools/standards are suitable for petrophysical and mineralogical evaluation of shale gas reservoir. This research outcome tried to answer the above questions and tells how mineralogy and rock characterization, total porosity, reasons of very low effective porosity and saturation which play a key role in selection and development of a shale gas play, can be evaluated and estimated using both conventional and unconventional techniques. The Roseneath and Murteree shale formations in Cooper Basin have been identified as potential shale gas reservoirs in South Australia. Two core samples from these carbonaceous shales intercepted in Della4 and Moomba46 wells were selected for this project. Core samples were used for number of reservoir characterization phases namely, a) minerals quantification and rock classification, b) visual identification and density of pores location in grains and matrix, c) their types, size classification and interconnectivity, d) evaluation of effective and total interstitial/intergranular and intragranular porosity. While log data from Della# 4 was applied in various resistivity models for water saturation estimation in Murteree shale.