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    A New Five-step Method for Advanced Evaluation of Shale Gas Formations and a Field Case Study of Marcellus Shale

    Source: Journal of Energy Resources Technology, Part B: Subsurface Energy and Carbon Capture:;2025:;volume( 001 ):;issue: 002::page 21006-1
    Author:
    Yildirim, Levent Taylan Ozgur
    ,
    Wang, John
    ,
    Elsworth, Derek
    DOI: 10.1115/1.4066417
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper presents a new five-step method to evaluate shale gas formations with intricate pore networks. The method overcomes challenges posed by traditional workflows through an improved workflow and a new unconventional petrophysical model: (a) the new model accurately defines components of shale gas formations, including effective and isolated pores occupied by free and adsorbed gas; (b) total organic carbon (TOC) is evaluated using three techniques using conventional well logs to determine which techniques are more accurate; and (c) the improved method provides integrated evaluation of geomechanical properties, resources in place, and selection of stimulation candidate. Our field case study on Marcellus shale shows that (a) density-based TOC technique is more accurate and average TOC in the study area is 2.8%; (b) density porosity model is more reliable and average porosity in the study area is 8.5%. Positive correlation between TOCs and porosities in the upper and lower Marcellus suggests that effective pores contribute more significantly to the pore network than isolated pores; (c) gas in place is 120 Bcf with 60% free gas for a drilling unit of 640 acres. Large contrasts in Young's modulus (1 million psi) and minimum in situ stress (893 psi) along the upper Marcellus-Stafford limestone boundary, and resistivity separations in the lower Marcellus member, show that the upper Marcellus is a good stimulation candidate. This method and field case study provide valuable insights to evaluate Marcellus shale reservoirs and improve economic recovery of the resources in place.
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      A New Five-step Method for Advanced Evaluation of Shale Gas Formations and a Field Case Study of Marcellus Shale

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4306591
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    • Journal of Energy Resources Technology, Part B: Subsurface Energy and Carbon Capture

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    contributor authorYildirim, Levent Taylan Ozgur
    contributor authorWang, John
    contributor authorElsworth, Derek
    date accessioned2025-04-21T10:38:05Z
    date available2025-04-21T10:38:05Z
    date copyright1/10/2025 12:00:00 AM
    date issued2025
    identifier issn2998-1638
    identifier otherjertb_1_2_021006.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4306591
    description abstractThis paper presents a new five-step method to evaluate shale gas formations with intricate pore networks. The method overcomes challenges posed by traditional workflows through an improved workflow and a new unconventional petrophysical model: (a) the new model accurately defines components of shale gas formations, including effective and isolated pores occupied by free and adsorbed gas; (b) total organic carbon (TOC) is evaluated using three techniques using conventional well logs to determine which techniques are more accurate; and (c) the improved method provides integrated evaluation of geomechanical properties, resources in place, and selection of stimulation candidate. Our field case study on Marcellus shale shows that (a) density-based TOC technique is more accurate and average TOC in the study area is 2.8%; (b) density porosity model is more reliable and average porosity in the study area is 8.5%. Positive correlation between TOCs and porosities in the upper and lower Marcellus suggests that effective pores contribute more significantly to the pore network than isolated pores; (c) gas in place is 120 Bcf with 60% free gas for a drilling unit of 640 acres. Large contrasts in Young's modulus (1 million psi) and minimum in situ stress (893 psi) along the upper Marcellus-Stafford limestone boundary, and resistivity separations in the lower Marcellus member, show that the upper Marcellus is a good stimulation candidate. This method and field case study provide valuable insights to evaluate Marcellus shale reservoirs and improve economic recovery of the resources in place.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA New Five-step Method for Advanced Evaluation of Shale Gas Formations and a Field Case Study of Marcellus Shale
    typeJournal Paper
    journal volume1
    journal issue2
    journal titleJournal of Energy Resources Technology, Part B: Subsurface Energy and Carbon Capture
    identifier doi10.1115/1.4066417
    journal fristpage21006-1
    journal lastpage21006-12
    page12
    treeJournal of Energy Resources Technology, Part B: Subsurface Energy and Carbon Capture:;2025:;volume( 001 ):;issue: 002
    contenttypeFulltext
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