Shale and inorganic salts are common types of this type of featureThe two main types of traps are as follows: structural and stratigraphic (Levorsen, 1967, p.64; North, 1985, p. 50). Just as the name suggests the structural traps are formed when the sedimentary rock is deformed. Through volcanic activity, plate tectonics, faulting and folding, the sedimentary rock might be deformed into seals. Due to the difference in the densities, the natural gas will form a layer on top of the crude oil and the oil floats atop the water in the saturated points of the crude oil reservoir. The formation of stratigraphic traps, however involves no external force. Meaning that just as the rocks are originally stratified the different strata that exist means that the reservoir may be sandwiched between two layers of traps. When this happens often the pressure from the water, gas and oil in the reservoir level, creates pressure and thereby making the landscape to form an undulating form which show that there exists a reservoir.To access oil we therefore have to engage in drilling of wells. Exploratory techniques of trying to find if there are commercially viable oil deposits in a region. One of the methods is referred to as seismic exploration and it is utilized in the location of traps that are slightly below the surface. Geology formation in the oil fields.
Hunt, M. J. Petroleum geochemistry and geology. WH Freeman and Company, 1979. Print
Hyne, Norman J. Nontechnical guide to petroleum geology, exploration, drilling, and production. PennWell Books, 2012. Print
Levorsen, Arville Irving. Geology of petroleum. Ed. Frederick Almet Fulghum Berry. San Francisco: WH Freeman, 1967. Print
North, F. K. Petroleum geology. Boston et al.: Allen and Unwin, 1985. Print
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