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Search Petrowiki: Mesozoic
...Glossary:Mesozoic A geologic time era from 65 million to 250 million years ago...
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Production from this field is from several Upper Cretaceous sandstone formations. The producing zones are in pressure communication in the gas cap and aquifer but separate in the oil column. The structure is a complexly faulted anticline with a major fault separating the west and east flanks. There is minor communication across the fault. Gross thickness is 384 ft, and net-to-gross thickness is 0.7.
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Permeability values of rocks range over many factors of 10; therefore, permeability is plotted on a logarithmic scale. Values commonly encountered in petroleum reservoirs range from a fraction of a millidarcy to several darcies. This page discusses factors affecting permeability associated with different rock types. The log10(k)-ฮฆ plot of Fig.1 shows four data sets from sands and sandstones, illustrating the reduction in permeability and porosity that occurs as pore dimensions are reduced with compaction and alteration of minerals (diagenesis). In these examples: * k of newly deposited beach sands exceeds 30 darcies * k of partially consolidated sandstones ranges from 300 to 2,000 md * k of consolidated sandstones ranges from 0.01 to 100 md * k of tight gas sandstones is 0.01 md Porosity is reduced from a maximum of 52% in newly deposited sandstones to as low as 1% in consolidated sandstones.
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For a clear knowledge of unconventional resources, the one firstly have to know the difference between both the conventional and the unconventional reservoirs. The conventional reservoirs are those in which wells can be drilled so that oil and natural gas can be produced at economic flow rates without large stimulation treatments or any special recovery process. On the other hand, the unconventional reservoir is the one that cannot be produced at economic flow rates or that does not produce economic volumes of oil and gas without the assistance of massive stimulation treatments or special recovery processes and technologies. With that rapid continuous decline in conventional oil and natural gas resources around the world that we witness, we became in a great need to exploit the unconventional resources to cover our shortages in energy.As the technology used in the petroleum industry is expanding and developing, introducing a new technology that exploits unconventional reservoirs has become a must to increase the world reserve by producing "unconventional" oil and natural gas resources that were previously out of the productivity scope. These unconventional reservoirs contain the future of our hydrocarbon supply.
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