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Title Seal characterization for Miocene-age rocks of Texas Gulf of Mexico
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Lu, J.
Meckel, T.A.
Trevino, R.H.

The objective of the study is to characterize seal formations of Miocene age for geological storage of carbon dioxide in Gulf Coast of Mexico and to establish workflow for evaluation of sealing capacity. Two Miocene cores were studied as potential sealing units. Core samples of various lithologies, such as silty mudstone, siltstone, and fine-grained sandstones were analyzed using Mercury Intrusion Capillary Pressure (MICP), Scanning Electron Microscopy (SEM) on ion-milled samples, and high-resolution X-ray goniometry (HRXTG) analyses. The samples show varying sealing ability with capillary entry pressure ranging from 137 to 2146 psi. Sealing ability is controlled by several factors, such as grain sorting, abundance of clay and matrix, abundance of calcite cement, and clay alignment. Negative correlation between calcite abundance and porosity suggests that calcite cementation is an important porosity-reducing factor. The degree of alignment of clay fabrics shows a negative influence on porosity and permeability. SEM studies on ion-milled samples reveal that the majority of the pores are intragranular and are related to corrosion (several to hundreds of nanometers in size). Most pores are isolated within mineral grains and are not connected to an effective porosity network. The study demonstrates a series of effective methods for evaluation of sealing ability of geological formations.

Collection GCCC Bookshelf
Pages 1
Issue Number
Keywords Petrography Characterization
Year 2011
Date Published 0000-00-00 00:00:00
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Item Type Abstract

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