Question

Geology help: Do the following on the log sheet provided.

1. Use the information on the scout ticket below to plot on the log the depth interval that was perforated (Perfs:).
2. Look at the logs and subdivide the section in terms of lithology
3. Fill in the central depth track with your interpreted lithology using the symbols.in the attached Graphic Lithology Key
4. Assign informal names (your choice) to these different rock types.
5. Look at the perfed interval and the corresponding lithology and describe the pay interval in terms of rock type and porosity.

NDIC File No: 7243     API No: 33-007-00408-00-00     County: BILLINGS     CTB No: 206085 Well Type: OG     Well Status: A     Status Date: 11/23/1991     Wellbore type: DIRECTIONAL Location: SENW 3-144-98     Footages: 2100 FNL 2460 FWL     Latitude: 47.323042     Longitude: -103.085897 Directional Bottom Hole Coordinates 123 N 192 W From Wellhead Current Operator: PETRO-HUNT, L.L.C. Original Operator: GULF OIL CORP. Current Well Name: ZABOLOTNY OBSERVATION 2 Original Well Name: ZABOLOTNY OBSERVATION #2 Elevation(s): 2572 KB     Total Depth: 10150     Field: LITTLE KNIFE Spud Date(s):  5/15/1980 Digital or Image Log(s) available: BCS 2.3MB, CND 1.3MB, DLL 2.4MB, TND1 480KB, TND2 943KB, TND3 908KB, TND4 1.4MB, TND5 551KB Formation Tops    K-GH 4780    K-M 5224    K-N 5345    K-IK 5622    J-S 6096    J-R 6533    T-S 7042    PM-MK 7430    PM-OP 7475    PM-BC 7810    PN-T 8374    M-BS 8490    M-KL 8796    M-MD 8950    M-MDR 9354    M-MDLS 9412    M-MDFA 9607 Casing String(s): 9.625" 3224'   5.5" 10139'   Completion Data    Pool: MADISON     Perfs: 9724-9870 G     Comp Dt: 1/19/1981     Status: AL     Status Dt: 11/23/1991     Spacing: NW Cumulative Production Data    Pool: MADISON     Cum Oil: 716601     Cum MCF Gas: 2167866     Cum Water: 1255815     [Interactive Performance Curve] [PDF Curve] Production Test Data    IP Test Date: 1/19/1981     Pool: MADISON     IP Oil: 181     IP MCF: 1120     IP Water: 77 Cores and Samples       Type: LS    Top: 9775    Bottom: 9882    Formation: M-MD     Type: LS    Top: 9882    Bottom: 9893    Formation: M-MD 9700 9890 9900

Answer 1

Hi Most of the answers you will get from the attached image.

Formation tops: 9690-9790: Sandstone, Name can be given as M-SD1

9791- 9870: Interbedded sandstone, Name can be M-INSD

9870-9912: Sandstone. Name can be M_SD2

Payzone: The pay zone consists of Sandstone and interbedded sandstone. The porosity and permeability of sandstone are good for production.

9700 9724 9800 9870 9900