Reservoir Model ofNorthern Platform, Sacroc

Field

F. Jerry Lucia, Charles Kerans, Fred Wang, Hongliu Zeng

Bureau of Economic GeologyJackson School of Geoscience

The University of Texas at Austin

From oil atlas

Make small production table

Salt Creek356 MMBO

Cogdell264 MMBO

Sacroc1,264 MMBO

Structure Top of Sacroc North

Platform

40-8 40-5 38-4 38-5 34-11 34-9 34-6 34-10 35-5 35-4 32-3 32-5 34-24 32-16

CN 1

CN 2

CN 3

EC 1Late Cisco

Three Miles

0

300

(ft)

Cross Section of Northern PlatformSacroc Field

West East

0.001

0.01

0.1

1

10

100

1000

104

105

0 1 10 100

Sacroc Northern Platform Reservoir

Per

mea

bilit

y (m

d)

Porosity (%)

Approach•Calculate average apparent rock-fabric number from core data for each stratigraphic layer.

•Calculate permeability profile for each well using apparent rock-fabric number from stratigraphy and total porosity from logs as input into global permeability transform.

•Interpolate permeability between wells constrained by seismic stratigraphy.

Problem•Only porosity and gamma-ray logs available.•Highly variable rock fabrics typical of icehouse conditions.

Apparent Rock Fabric

Number

Total Porosity (fraction)

ARFN =10^((9.7982+8.6711*LOG10(cpor)-LOG(Cperm))/(12.0838+8.2965*LOG(cpor)))

ARFN =10^((9.7982+8.6711*LOG10(cpor)-LOG(Cperm))/(12.0838+8.2965*LOG(cpor)))

ARFNPhi Perm

0.11 0.3 3.060.128 0.6 3.070.123 1 2.630.174 14.9 2.250.187 3.2 3.11

0.2 4.1 3.140.167 7.4 2.450.15 1 3.20

0.178 3.3 2.980.123 1.1 2.580.028 0.01 121.620.033 0.01 113204.120.11 3.2 1.73

0.151 54.3 1.510.185 251.3 1.49

Core Data

ARFN =10^((9.7982+8.6711*LOG10(cpor)-LOG(Cperm))/(12.0838+8.2965*LOG(cpor)))

Apparent Rock Fabric NumberAssuming total porosity = interparticle porosity

0

2

4

6

8

10

12

14

16

0 1 2 3 4 5

ARFN Profile

Dep

th

ARFN

ARFN = 2.8

ARFN = 1.6 Cycle 1

Cycle 2

40-8 40-5 38-4 38-5 34-11 34-9 34-6 34-10 35-5 35-4 32-3 32-5 34-24 32-16

CN 1

CN 2

CN 3

EC 1Late Cisco

Three Miles

0

300

(ft)

Cross Section of Northern PlatformSacroc Field

West East

Location of Core Analysis DataCanyon 2 and 3

17-5

18-5

19-6

20-120-15

27-7

32-5

34-634-8

37-2 37-4

56-2 56-4

New Core Analysis

Old Core Analysisand core

Legend

Old Core Analysisno core

49-2

CN 2

CN 3