Subcritical propagation and coalescence of oil-filled cracks: Getting the oil out of low-permeability source rocks

Details Subcritical propagation and coalescence of oil-filled cracks: Getting the oil out of low-permeability source rocks Subcritical propagation and coalescence of oil-filled cracks: Getting the oil out of low-permeability source rocks

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3701305j&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 1, CiteID L01305

Statistics

Computation

1

Structural Geology: Mechanics, Theory, And Modeling, Computational Geophysics: Modeling (1952, 4255), Structural Geology: Fractures And Faults

Scientific paper

We use a fracture mechanics model to study subcritical propagation and coalescence of single and collinear oil-filled cracks during conversion of kerogen to oil. The subcritical propagation distance, propagation duration, crack coalescence and excess oil pressure in the crack are determined using the fracture mechanics model together with the kinetics of kerogen-oil transformation. The propagation duration for the single crack is governed by the transformation kinetics whereas the propagation duration for the multiple collinear cracks may vary by two orders of magnitude depending on initial crack spacing. A large amount of kerogen (>90%) remains unconverted when the collinear cracks coalesce and the new, larger cracks resulting from coalescence will continue to propagate with continued kerogen-oil conversion. The excess oil pressure on the crack surfaces drops precipitously when the collinear cracks are about to coalesce, and crack propagation duration and oil pressure on the crack surfaces are strongly dependent on temperature.

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