Carbonate reservoirs: porosity evolution and diagenesis in a by Clyde H. Moore

By Clyde H. Moore

This accomplished textual content and accompanying CD-ROM will give you the reader with an built-in evaluation of diagenesis and porosity evolution in carbonate petroleum reservoirs and historic carbonate rock sequences. The preliminary chapters of this quantity offer an outline of the carbonate sedimentologic process and the applying of series stratigraphic thoughts to carbonate rock sequences. the character of carbonate porosity and its keep an eye on via diagenesis is explored. Porosity type schemes are targeted, in comparison, and their application tested. the character and features of diagenetic environments and instruments for his or her acceptance within the old list are unique. the center chapters of the ebook include an intensive exam of the key, surficial diagenetic environments, resembling basic marine, evaporative marine and meteoric environments, emphasising porosity enhancing strategies illustrated by means of a variety of case histories. There f

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Extra resources for Carbonate reservoirs: porosity evolution and diagenesis in a sequence stratigraphic framework

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_ . 8. Sequence stratigraphic models for rimmed shelves. A ) Transgressive systems tract B} Highstand systems tract C) Lowstand systems tract D ) Type 2 unconformity and development of a shelfmargin wedge E} Drowning unconformity, Used with permission of Blackwell Science. prograding complexes developed on the outer ramp slope. The rimmed shelf sequence stratigraphic model As previously discussed, a rimmed carbonate shelf may evolve from a distally steepened ramp, or it may form over relict rimmed shelf topography inherited from an earlier sedimentary episode.

The smaller, atoll-like platforms are generally associated with oceanic volcanism. Isolated platforms are generally steep-sided rimmed platforms with reefing along windward margins of the larger platforms; or, in the case of the smaller platforms, they may be totally rimmed with reefs. Mature, well-developed isolated carbonate platforms are generally siliciclastic free. Their interior platform facies are generally low-energy mudstones and wackestones with possible patch reefs. Under arid conditions, the central lagoon, or platform interior may become hypersaline and develop evaporite deposition.

The I ;-NET DEPOSITIONALREALM--NET 41 predepositional stage begins when individual sedimentary particles form and includes intragranular porosity such as is seen in forams, pellets, ooids, and other non-skeletal grains. This type of porosity can be very important in certain sediments. The depositional stage is the time involved in final deposition, at the site of final burial of sediment or at the site of a growing organic framework. Porosity formed during this stage is terrned depositional porosity and is important relative to the total volume of carbonate porosity observed in carbonate rocks and sediments (Choquette and Pray, 1970).

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