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Geomechanical properties will constrain CO_(2)injection into the lower Ordovician Rose Run sandstone deep saline reservoir,appalachian basin,Kentucky,USA

引用

Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 947-960页

作者： John Richard Bowersox Stephen F.Greb Junfeng Zhu David C.Harris Kentucky Geological Survey University of KentuckyLexingtonKY40506-0107USA

The Kentucky Geological Survey(KGS)1 Hanson Aggregates stratigraphic research well,Carter County,Kentucky,USA,was drilled to a total depth of 1474 m as a field-scale test of potential CO2 storage reservoir properties in the Central appalachian *** properties of the Rose Run sandstone(upper Ordovician Knox group)were tested for its suitability as a storage reservoir.A 9.8-m thick section of the Rose Run was penetrated at 1000 m drilled depth and a whole-diameter core and rotary sidewall cores were *** porosity and permeability measured in core plugs were 9.1%and 44.6 mD,*** vertical stress gradient calculated in the wellbore was 26 MPa/*** fractures in dolomites underlying and overlying the Rose Run follow the contemporary N53E appalachian basin stress *** Rose Run elastic geomechanical properties were calibrated to values measured in core plugs to evaluate its fracturing risk as a CO2 storage *** Young’s modulus and Poisson’s ratio values of the Rose Run were 45 GPa and 0.23,respectively,whereas Young’s modulus and Poisson’s ratio values were 77.1 GPa and 0.28,respectively,in the overlying Beekmantown dolomite,suggesting the Rose Run may fracture if overpressured during CO2 injection but be confined by the *** compressive strength measured in core plugs found the Rose Run and Beekmantown fractured at mean axial stresses of 156.5 MPa and 282.2 MPa,respectively,confirming the Beekmantown as suitable for confining CO2 injected into the Rose Run.A step-rate test was conducted in a mechanically-isolated 18.6-m interval bracketing the Rose *** Rose Run reservoir pressure was 9.3 MPa,and fracture gradient under injection was 13.6 MPa/km,suggesting step-rate testing before CO2 injection,and subsequent pressure monitoring to ensure *** the region around the KGS 1 Hanson Aggregates well is underpressured and adjacent to faulted Precambrian basement,further research is neede

关键词： appalachian basin Rose Run sandstone Geomechanics Carbon sequestration Step-rate testing

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