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Engineering and Construction
Pages 5 (1255 words)
Name Institution Lecturer Course Date Sandstone Reservoirs Introduction A reservoir is defined as a natural chamber below the earth’s surface comprising of rock material where fluids migrate and are stored. The underground rocks have different levels of permeability and porosity.
Important factors geologists consider in reservoir studies are structure, depth, stratigraphy, faults, reservoir pressure, fractures and aquifer system (Abdus, Iqbal and Buchwalter 27). It has been observed that reservoir rock properties vary widely from one location to another. Reservoirs allow transmission of fluids under the influence of certain forces. The origin and development of reservoir properties are the deposition processes that occurred during prehistoric times. The main types of reservoirs include sandstones, carbonate rocks, shales and conglomerates (Abdus, Iqbal and Buchwalter 40). Types of Reservoirs 1. Sandstone Reservoirs Sandstone refers to a mass of a sedimentary rock made up of small sand sized rock grains or minerals. A continuum of sandstone rocks is what makes up a sandstone reservoir. Sandstone reservoirs generally have high permeability and porosity distributions represented by stochastic reservoir heterogeneity. The textural features of these reservoirs give an indication of the environment where they are deposited. Their characteristic colors are dark brown, light beige and tan. Sandstones are classified based on amount of grains of a specific chemical composition. Examples are arkosic and quartz sandstones. The predominant grains in arkosic and quartz sandstones are feldspar and quartz respectively. ...
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