Reserve Estimation Technique for Low Permeability Shale Gas Formations of Lower Indus Basin, Using Simulation Approach

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.