Page 69 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Basic Principles, Definitions, and Data 57

Data [56] from a number of different reservoirs for the values of m, the
cementation or shape factor, and n, the saturation exponent, in Equation 5-71
are presented in Table 513.
Based on these data and other reasoning, Coats and Dumanoir [56] have
proposed that the two exponents, m and n, can be assumed to be equal for
water-wet, consolidated reservoirs. Ransome [65] has proposed that the satura-
tion exponent may be a special case of the porosity exponent, and the two
exponents may bear certain similarities but not necessarily the same value.
As recently pointed out by Dorfman [86], data in Table 5-13 strongly suggest
that assuming a saturation exponent of 2 can result in serious errors in the

Table 5-13
Values of Constants in Equation 5-71
~~
Lithology Avg. m Avg. n
Ordovician Simpson, W. Texas ss 1.6 1.6
and E. New Mexico
Permian, W. Texas ss 1.8 1.9
Ellenburger, W. Texas LS and Dol. 2.0 3.8
Pennsylvanian, W. Texas LS 1.9 1.8
Viola, Bowle Field, No. Texas LS 1.77 1.15
Edwards, So. Texas LS 2.0 2.8
Edwards Lime, Darst Creek, So. Texas LS 1.94, 2.02 2.04, 2.08
Frio, So. Texas ss 1.8 1.8
Frio, Agua Duke, So. Texas ss 1.71 1.66
Frio, Edinburgh, So. Texas ss 1.82 1.47, 1.52
Frio, Hollow Tree, So. Texas ss 1.80, 1.87 1.64, 1.69
Government Wells, So. Texas ss 1.7 1.9
Jackson, Cole Sd., So. Texas ss 2.01 1.66
Miocene, So. Texas Cons. SS 1.95 2.1
Uncons. SS 1.6 2.1
Navarro, Olmos, Delmonte, So. Texas ss 1.89 1.49
Rodessa, E. Texas LS 2.0 1.6
Woodbine, E. Texas ss 2.0 2.5
Travis Peak and Cotton Valley, HD. SS 1.8 1.7
E. Texas and W. Louisiana
Wilcox, Gulf Coast ss 1.9 1.8
Annona, No. Louisiana Chalk 2.0 1.5
Cockfield, So. Louisiana ss 1.8 2.1
Frio, Chocolate Bayou, Louisiana ss 1.551.94 1.73-2.22
Sparta, So. Louisiana (Opelousas) ss 1.9 t .6
Nacatoch, Arkansas ss 1.9 1.3
Pennsylvanian, Oklahoma ss 1.8 1.8
Bartlesville, Kansas ss 2.0 1.9
Simpson, Kansas ss 1.75 1.3
Muddy, Nebraska ss 1.7 2.0
Lakota Sd., Crook Co., Wyoming ss 1.52 1.28
Madison, No. Dakota LS 1.9 1.7
Mississippian, lilinois LS 1.9 2.0
Mississippian, lilinois ss 1.8 1.9

After Reference 56.