Abstract
Produced Natural Gas from the low permeability tight shale reservoirs are called as Shale Gas, has a great importance in economic terms of supply and demand because of natural gas prices. Shale is composed of a rock having sedimentary of clastic nature that contains mudstone and siltstone under the specific reservoir conditions of pressure and temperature are called Shale gas. Shales are of the soft nature formation that formed due to pre-existing rocks which have been elated, worn out and transported into a new form of rock. Shale is found in reservoir rock where organic material migrated upward and in areas where conventional clays are normally present. Shale is known as unconventional energy source. Due to high demand in population rate and increasing consumption of natural gas in transportation sector it is challenging for Pakistan to meet the energy requirements and needs in utilizing both conventional and unconventional energy resources. In this research study, the set of data, tools and methodology applied to estimate initial gas in place (IGIP), recoverable reserves, recovery factor, and risk analysis of shale gas reservoirs. The study reveals potential and characteristics of shale reservoir to grade the areas in term of shale thickness, its hydrocarbon generation potential, current depth and maturity for shale gas exploitation.
Highlights
Shale gas is producible from its geological origin, typically an organic-rich, black shale
The shale composition depends upon the amount of total organic carbon (TOC) (Guarnone et al.,m20in1e2r)als and quartz grains and the typical color is gray
The shale composition depends upon the amount of total organic carbon (TOC) (Guarnone et al, 2012) Table 1: CompToasbitlieo1n: oCfomShpaolseitiGonasofRSehsaelervGoairssR(eSsoenrvdoeirrgsald et al, 2010)
Summary
Shale gas is producible from its geological origin, typically an organic-rich, black shale. These are the types of source rocks of oil and gas. Shale that produces the gas meaning as a type of low matrix-permeability and low porosity reservoir rocks (Suarez-Ruiz and Hackley, 2012). Shale contain clay tend to be yielding and to collapse instead of shattering Shale that produced the gas function as low porosity and low matrix-permeability reservoir rocks (Suarez-Ruiz and Hackley, 2012). The shale composition depends upon the amount of total organic carbon (TOC) (Guarnone et al.,m20in1e2r)als and quartz grains and the typical color is gray. Shale gas reserves are about 3.9 TCF in Miano field, Sindh and recovery from these reserves is about 1.5 TCF. (U.S Energy Information, 2012)
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