By T.D. van Golf-Racht
In the modem language of reservoir engineering by way of reservoir description is understood the totality of simple neighborhood info in regards to the reservoir rock and fluids which through numerous techniques are extrapolated over the whole reservoir.
Fracture detection, overview and processing is one other crucial step within the strategy of fractured reservoir description. In bankruptcy 2, all parameters concerning fracture density and fracture depth, including quite a few tactics of knowledge processing are mentioned intimately. After a couple of box examples, built in Chap. 3, the major target is still the quantitative review of actual homes. this is often performed in Chap. four, the place the assessment of fractures porosity and permeability, their correlation and the similar perfect geometrical versions as opposed to these parameters are mentioned in nice element. precise rock houses reminiscent of capillary strain and relative permeability are reexamined within the mild of a double-porosity reservoir rock. with the intention to whole the consequences acquired by way of direct measurements on rock samples, Chap. 5 examines fracturing via oblique measurements from a number of logging results.
The whole fabric contained in those 5 chapters defines the fundamental actual parameters and exhibits methods for his or her overview that may be used extra within the description of fractured reservoirs.
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Extra resources for fundamentals of fractured reservoir engineering
Confining pressure. d. Fracture or yield data Since the estimation of long term rock properties from short term triaxial compression tests performed in the laboratory is uncertain, it was proposed to use an elastic limit. In other words, to utilise the fact that in a strain-stress curve there is a limit in stress over which the linear strain-stress relationship is no longer valid. This limit, which is called a marked non-linearity in the stress-stvain curue, begins before fracturing as a result of a considerable microcracking process inside the rock.
The end of the stylolitizationprocess is due to various conditions, but it is certain that in the absence of water (hydrocarbons substitute water), or in the case of complete cementation of the pore space by calcite, stylolitization ceases. Slickolites are microfault (fault) surfaces where a solution-pressure-diffusion process has sculptured their surfaces. In general, slickolitic surfaces show displacements of millimeters, centimeters, and in extremely rare cases, layer dimensions. Field example : The presence of oil or gas in a stylolitic zone can be recognized if stylolitizationis interrupted in the same reservctir without any additional changes.
3. GEOLOGICAL MODEL FOR THE SIMULATION OF FRACTURING Models of the fracturing process have been developed recently by Quiblier" and Ramstads. The main objective of the model developed by Quiblier was to find the 24 areas of highest fracture density or highest probability of fracturing by computing a series of iso-risk maps for fracture development. His basic idea was that the tectonic stresses in the reservoir could be computed by using the present shape of different layers and assuming that the material was deformed from an original undeformed plane state.