reservoir rock in fuel geology
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This document discusses reservoir rock, which is subsurface rock with sufficient porosity and permeability to allow for the accumulation of petroleum. It defines porosity as the capacity for rocks to contain fluids, describing primary porosity from spaces between deposited particles and secondary porosity from post-depositional dissolution. Permeability is the ability of fluid to pass through porous rock. Major reservoir rock types include siliciclastic rocks from weathered igneous and sedimentary materials, and marine, lacustrine, and fluvial rocks formed in various depositional environments.
reservoir rock in fuel geology
- 1. RESERVOIR ROCK BY: THOMAS CHINNAPPAN . A , M.SC.APPLIED GEOLOGY, PERIYAR UNIVERSITY, SALEM.
- 3. 3 RESERVOIR ROCKS A reservoir rock is a subsurface volume of rock that has sufficient porosity and permeability to permit the migration and accumulation of petroleum under adequate trap conditions.
- 4. 4 • Major and minor reservoir rocks are determined from the percentage of in-place petroleum that originated from a particular pod of active source rock. • If the volume of in-place petroleum is unavailable, the volume of recoverable hydrocarbons are used
- 5. 5 POROSITY Is also defined as a measure of the capacity of reservoir rocks to contain or store fluids. The porosity is genetically classified basing on standard sedimentologic description of reservoir rock; there are • primary and • secondary porosity.
- 6. 6 (a) The primary porosity types are: i) Inter-particle- In this type by which rock content was quickly lost in muds and carbonate sands through compaction and cementation respectively. This type is mostly found as siliciclastic sands. ii) Intra particle porosity by which the porosity is made of interiors of carbonate skeletal grains.
- 7. 7 Secondary porosity, the porosity formed after deposition leads to other couple of reservoirs types. i) Dissolution porosity type is made of carbonate dissolution and leaching. It is also called carbonate reservoirs. ii) Fracture porosity which is characterized by not being voluminous.
- 8. 8 Primary and Secondary porosity
- 9. 9 PERMEABILITY • Permeability is a measure of the ability of a fluid to pass through its porous medium. Permeability is one of important to determine the effective reservoir. • Porosity and permeability are two properties describing the reservoir rock capacity with regard to the fluid continence. • Moreover, a reservoir rock can be porous without being permeable.
- 10. Major type of reservoir rocks Siliciclastic Reservoir Shallow and Deep Marine Reservoir Lacustrine Reservoir Fluvial Reservoir
- 11. 11 Siliciclastic sedimentary rocks are the most abundant of the sedimentary rock. They are formed from the detritus left over from the weathering of igneous, metamorphic, and older sedimentary rocks. Siliciclastic Reservoir
- 12. 12 Shallow and Deep Marine Reservoir On the clastic sedimentary, contained some precipitation area, as one in marine area. Rock type can be formed in deposition marine areas such as shelf sandstone and turbidity sandstone. Shelf sandstones are formed from precipitating in the shallow marine area. Turbidity sandstones: rock formed in deep marine area with rotation force existing rotation deep current so as formed the coarse layer
- 13. 13 Lacustrine Reservoir This type of reservoir formed in basin containing water surrounded by land and initially formed by tectonic processes, volcanic, rifting, soil movement, the erosion by the wind on the coast or in land. The texture of sedimentary rocks in the environments usually granules grained and the size between 2 mm–4 mm.
- 14. 14 Fluvial Reservoir Type reservoir generated by the flow of the river where the process is formed by the erosion, transport and deposition of forming depositional formation.
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