By Wayne M. Ahr
* An available source, protecting the basics of carbonate reservoir engineering* comprises discussions on how, the place and why carbonate are shaped, plus reports of simple sedimentological and stratigraphic rules to give an explanation for carbonate platform features and stratigraphic relationships* deals a brand new, genetic class of carbonate porosity that's specially beneficial in predicting spatial distribution of pore networks.* encompasses a resolution handbook
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Extra resources for Geology of Carbonate Reservoirs: The Identification, Description and Characterization of Hydrocarbon Reservoirs in Carbonate Rocks
Example text
These muddy, grainy mixtures in which the grains are widely dispersed (“floating”) in the mud matrix are termed wackestones. Most industry professionals use the Dunham classification today because the terms are shorter, and easier to log when working on large quantities of rock, they do not require tedious counting or percentage estimates, and they seem to evoke mental images of rock properties that can be related to reservoir properties. For the reservoir analyst, detrital rock classifications based on depositional texture are the most practical and easiest to use.
4-mm range for 1-mm diameter ooids. Porosity does not vary with grain diameter, but it does vary with packing and sorting. 9). 10), the porosity of a cubic-packed sample is reduced from about 48% to about 13%. Grain shape also affects porosity. 9 The influence of grain packing on porosity. 9%. Pores, shown below the grain packs, are “negative images” of the grains. In the cubic packing example it is clear that each pore is connected to others by three pore throats. Later this will be known as a pore system with a coordination number of 3.
This philosophy has merit in most cases, but in the end, the task of the reservoir geologist is to formulate interpretive models for use in exploration and development. In carbonate rocks, reservoir porosity and permeability can be formed by a variety of processes. These processes create the rock properties we describe with rigidly objective terms. Some of the formative processes may have affected reservoir rocks more than once; therefore an accurate reservoir description should incorporate terminology that classifies the altered properties, the processes that created them, and at least an estimate of the number of times the rock properties underwent change.
