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Evolution of the Percolation Threshold in Muds and Mudrocks During Burial

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2019GL083723· OSTI ID:1560210
 [1];  [2];  [3]
  1. Hildebrand Department of Petroleum and Geosystems Engineering The University of Texas at Austin Austin TX USA
  2. Department of Geology and Geophysics Texas A&,M University College Station TX USA
  3. Jackson School of Geosciences The University of Texas at Austin Austin TX USA
Abstract

Muds and mudrocks are important barriers to flow and perform this role over their entire depositional history, from mediating sediment‐ocean methane exchange to preventing leakage from hydrocarbon reservoirs, CO 2 sequestration targets, or nuclear waste repositories. It is well established that the percolation threshold, which is the fluid saturation at which percolation occurs, is directly related to the pressure sealing capacity of a mud or mudrock. However, the evolution of the percolation threshold during burial and diagenesis is not well understood. Using a data set of natural muds and mudrocks and resedimented laboratory mixtures, we show that the percolation threshold is strongly controlled by porosity, achieving a minimum of 0.10–0.30 at a porosity of 0.40, and increasing as porosity increases or decreases from that value, to as high as 0.60 at deposition and >0.80 at porosity <0.10. This implies a highly disconnected pore network at high and low porosities.

Sponsoring Organization:
USDOE
OSTI ID:
1560210
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 14 Vol. 46; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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