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Book Chapter

The Fate of Primary Porosity During and After Burial-Diagenetic Constraints on the Depositional Model Strategy

Published:
January 01, 1979

Abstract

As mentioned earlier the utilization of the depositional model as an exploration tool necessitates the preservation of at least some of that porosity during and after burial. This however, is not a valid working strategy for carbonate rock sequences. The preservation of effective primary porosity under deep burial conditions is an exception rather than the rule, since most carbonate reservoirs seem to be characterized by secondary leached porosity, or at best, intercrystalline porosity associated with later dolomitization — both situations controlled by chemical diagenetic processes rather than physical depositional processes. Indeed, under those circumstances where primary porosity is preserved, the actual detailed distribution of primary pore space may be controlled to a great extent by presence or absence of pore fill cement, rather than a change of facies associated with the physical processes present at the site of deposition.

The relative solubility of carbonate minerals as a group, particularly at the time of formation (aragonite and magnesian calcite), makes carbonate sediments and rock sequences particularly susceptible to chemical diagenetic changes through time, particularly when it is realized that pore fluid composition changes and evolves during the burial process. This susceptibility necessitates an expansion of the basic exploration predictive strategy when dealing with carbonate rock sequences to include potential porosity controlling diagenetic pathways after burial.

The following two papers illustrate the point forcefully. The first paper by Moore, et al., describes a Lower Cretaceous beach sequence that contains all the sedimentary structures normally associated with quartzose clastic beaches, including both texture

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Contents

AAPG Continuing Education Course Notes Series

Geology of Carbonate Porosity

Don Bebout
Don Bebout
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Graham Davies
Graham Davies
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Clyde H. Moore
Clyde H. Moore
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Peter S. Scholle
Peter S. Scholle
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Norman C. Wardlaw
Norman C. Wardlaw
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American Association of Petroleum Geologists
Volume
11
ISBN electronic:
9781629811888
Publication date:
January 01, 1979

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