Page 294 - Geology of Carbonate Reservoirs

INDEX 275

dependence on rock properties, 31–33 Reservoir(s)
diagenetic, 30, 144, 150 characterization, 5
effective, 7 compartmentalized, 170
equation defi ning, 31 depositional, checklist for identifying and
estimates of reservoir quality based on, exploiting, 136–140
33–34 description, 5
fracture, 182, 186 diagenetic, checklist for identifying and
calculating saturation (S w ) in, 189 exploiting, 172–173
scale-dependency of, 188 engineering, 5
Lonoy classifi cation of, 40–41 facies-selective, 2
Lucia classification of, 39–40, 108 fabric-selective, 2, 36–37

proxies for, 26 fracture, checklist for identifying and
reduced during burial, 33 exploiting, 195
sandstone, 9 fractured, defi ned, 177
secondary index (Schlumberger SPI), 50 geology, 5
separate vug, influence on Archie m hybrid

exponent, 60 depositional-diagenetic (type I), 106
total, 107 diagenetic-fracture (type II) 176
Poza Rica trend (Mexico), 46 net pay calculations in, 87
Pressure net sand calculations in, 87
buildup tests, 193, 251. See also Fractures, oil-wet, 63
presence in borehole, indirect evidence of values of saturation exponent in, 62
communication, 246 quality (rankings), 17
confi ning, subsurface, 177, 187 slice-map method, 234–236, 250
displacement, capillary, 66–67 recovery effi ciency, 71–72, 73
entry, capillary, 66 in karst reservoirs, 162
threshold, capillary, 66 rocks, multicomponent, 201
transient test, 8, 246 stratabound, 2
Properties, rock visualization of, 3D, 234
capillary, 57. See also Capillary pressure water-wet, 63
dependent (derived), 14, 30, 204 Resistivity

fundamental (intrinsic), 14, 116, 202 flushed zone (R xo ), 58
primary, 13, 106 formation at 100% water saturation (R o ),
secondary, 13–14 58
tertiary (latent), 14, 47 formation water (R w ), 59
invaded zone (R i ), 58
Quanah City field, Texas, 241–244 true formation (R t ), 58

Chappel Formation (Mississippian) in, 241 Rhizocretions, 115
Ellenburger Formation (Ordovician) in, 241 “Roaring 40s” latitude (environment in), 124
Spiculiferous zones in, 241 Rock typing, 34–35, 107, 205
Winland “R 35”, 205
Ramp(s) Rock units
distally-steepened, 78, 82 hierarchical classifi cation of, 83
environmental subdivisions on, 121 time-transgressive, 88
homoclinal, 78, 82 Rudstone, 15
inner, 121
middle, 121 Sabine Uplift, ancestral, 228, 231
outer, 121 Sacramento Mountains, New Mexico, 225
slope angles on, 78, 82 Saddle dolomite
Reef(s) late, in fractures, 148, 166, 248
conditions favorable for growth of, 82 late diagenetic, 238, 243
framestone, 125 thermochemical sulfate reduction (TSR) and,
framework/detritus ratio, 30 148, 166
patch, 82, 124 Saint Louis Limestone Formation, 224. See also
Stuart City trend (Cretaceous) Texas, 126 Conley fi eld
trends, continuous, 82 Salinity, hyper and hypo, 123

Reflux, brine and dolomitization, 152, 225 Salt Basin, East Texas, 231