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    • Fracture Sustainability Test, Pre- and Post-Test Photomicrographs

    Metadata Updated: July 17, 2021

    The primary objective of this research is to understand how different rock types, mineral and fluid compositions, and fracture surface textures determine the longevity of fracture apertures, so that selection of reservoir rock can be economically optimized to reduce future refracturing. We are performing laboratory tests to study this in a custom apparatus at conditions relevant to EGS, with temperatures up to 250 degrees C (design maximum 300 degrees C). Our approach is to perform a number of long term (up to several months) laboratory experiments using relevant rock samples with different mineralogies to explore fracture sustainability under EGS conditions. We use an apparatus that allows direct application of a normal force on the fracture faces of a single fracture in a sample having a sheared, tensile fracture. We flow brine of a specified composition through the aperture, and simultaneously measure the fracture permeability and closure. We collect the effluent water for chemical and isotopic analysis. We are numerically modeling our tests and comparing experimental and numerical results.

    This submission includes photomicrographs of pre-test (unreacted) and post-test (reacted) samples from Brady well BCH-03 at various depths, Desert Peak well DP 35-13, and samples of Stripa granite. The photomicrographs are provided using uncrossed and crossed polarized light (xpl). UN is uncrossed nicols, CN and xpl are crossed nicols (crossed polars). The magnification listed is just referring to the objective lens that was used, not the total magnification of the images. With a 5x objective, the bottom dimension of an image is 1.75 mm. With 10x the bottom dimension of an image is 0.875 mm, and with 2x the bottom dimension of an image is 4.375 mm.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: Creative Commons Attribution

    Downloads & Resources

    Dates

    Metadata Created Date June 24, 2021
    Metadata Updated Date July 17, 2021

    Metadata Source

    Harvested from OpenEI data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date June 24, 2021
    Metadata Updated Date July 17, 2021
    Publisher Lawrence Berkeley National Laboratory
    Maintainer
    Doi 10.15121/1666365
    Identifier https://data.openei.org/submissions/3872
    Data First Published 2016-09-26T06:00:00Z
    Data Last Modified 2021-05-17T16:19:17Z
    Public Access Level public
    Bureau Code 019:20
    Metadata Context https://openei.org/data.json
    Metadata Catalog ID https://openei.org/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Data Quality True
    Harvest Object Id a3f54ec4-7e3d-49d0-82c7-5c1473a11dd4
    Harvest Source Id 7cbf9085-0290-4e9f-bec1-91653baeddfd
    Harvest Source Title OpenEI data.json
    Homepage URL https://gdr.openei.org/submissions/1234
    License https://creativecommons.org/licenses/by/4.0/
    Old Spatial {"type":"Polygon","coordinates":-119.2167,39.55,15.097133109728262,39.55,15.097133109728262,59.70006252784378,-119.2167,59.70006252784378,-119.2167,39.55}
    Program Code 019:006
    Projectlead Lauren Boyd
    Projectnumber FY13 AOP 5.1
    Projecttitle Sustainability of Shear-Induced Permeability for EGS Reservoirs
    Source Datajson Identifier True
    Source Hash b3112e8e954b95c9b344288f138e083c50f1cee2
    Source Schema Version 1.1
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