Construction of a Reservoir Model by Integrating Geological and Engineering Information - Bell Creek Field, a Barrier/Strandplain Reservoir

Convective fluid flow through heterogeneous country rocks during contact metamorphism

“…Variance of country rock permeability in the models ranges from 0.25 to 1.5 which is within the range estimated from geostatistical studies of sedimentary rocks (---0.04 to 3 [Gelhat, 1993]). The 2500-m range used for most of the hypothetical contact aureoles in this study is comparable to measured horizontal ranges in some sedimentary rocks [Jackson et al, 1991;Clifton and Neuman, 1982]. However, vertical correlation distances in layered sedimentary rocks are shorter than their corresponding horizontal correlation distances [Fogg and Lucia, 1990;Davis et al, 1993].…”

“…Geostatistical estimates of the mean, variance, and spatial correlation structure of a permeability field can be derived from field data when available [e.g., Varljen (1) N A series of •,(h) values can be calculated using different pair sets for each different lag distance to evaluate how the variability between samples changes as the distance between samples changes. A common observation is that as the lag distance h between measurement pairs increases, the difference between each pair of measured values is also likely to increase [e.g., Clifton and Neuman, 1982;Jackson et al, 1991]. This corresponds to an increase in •,(h) and indicates less correlation between measurement pairs.…”

Field guide to Muddy Formation outcrops, Crook County, Wyoming

“…Comparison _f subsurtace and outcrop permeability cumulative distribution functions. Similar frequency functions exist liar outcrop middle shoreface facies and subsurface, Iow-diagenetic cement content ti)reshore facies (a), as well as outcrop and subsurface lower shoreface facies (b) (Jackson et al, 1991 ).…”

“…Based on outcrop and subsurface studies it was found that while calcite cemented zones could be traced laterally for thousands of feet in outcrop, no such zones were presenl within the reservoir at Bell Creek ( Jackson et al, 1991 ). Additionally, no tight clay-cemented zones were recognized in the oulcrop, while in the reservoir such zones affect the entire reservoir section and vary over lateral dislanccs of about 1,5()(} ft.…”

Integration of a Geological-Engineering Model With Production Performance: A Case Study at Patrick Draw Field, Wyoming

“…The water-oil contact serves as a flow barrier for nearby injection wells due to the low compressibility of water, resulting in a high Hall plot slope. (2) (3)…”