Upload
mahmoudalkafaji
View
233
Download
0
Embed Size (px)
Citation preview
8/13/2019 Combining Gamma Ray Logs With Boring Logs
1/31
Combining Gamma Ray
Logs with Boring Logs
By:Leonard Billingsley
Frank VernonOklahoma Corporation Commission
Petroleum Storage Tank Division
8/13/2019 Combining Gamma Ray Logs With Boring Logs
2/31
What Does the Gamma Ray
Tool Detect? Natural Gamma Rays
Energetic form of electromagneticradiation produced by radioactivedecay**Wikipedia
8/13/2019 Combining Gamma Ray Logs With Boring Logs
3/31
What ProducesGamma Rays?
Most common sources: Potassium
Thorium Uranium - Radium
8/13/2019 Combining Gamma Ray Logs With Boring Logs
4/31
Where Are TheseElements Found?
In zones containing potassiumfeldspars (i.e. granites, feldspathicsands)
Volcanic and igneous rocks Sands containing volcanic ash
Clays
8/13/2019 Combining Gamma Ray Logs With Boring Logs
5/31
The Gamma Logging Tool:What Does It Do?
Detector is a thallium-doped sodium-iodide crystal Crystal emits light when it absorbs a
Gamma Ray Light emissions are counted and
ultimately displayed as counts persecond (CPS) vs. depth on a graph This graph is then referred to as a
Gamma Ray Log
8/13/2019 Combining Gamma Ray Logs With Boring Logs
6/31
8/13/2019 Combining Gamma Ray Logs With Boring Logs
7/31
Gamma
RayLog
8/13/2019 Combining Gamma Ray Logs With Boring Logs
8/31
Applications of Combining GammaRay Logs and Boring Logs
Zone identification Zone correlation Zone content Seal identification Boring log interpretation Potential transport zone identification Potential source zone identification
8/13/2019 Combining Gamma Ray Logs With Boring Logs
9/31
Assumptions: Unconsolidated formation (can split-spoon)
Sand and clay sequence Have field screening values Have cut-off values (OVM value between
source and non-source interval) Contaminants are volatile organics
Only natural radioactive sources are present Bentonite has a high K content Other exceptions
8/13/2019 Combining Gamma Ray Logs With Boring Logs
10/31
Zone Identification
Seal
Sand Clay
8/13/2019 Combining Gamma Ray Logs With Boring Logs
11/31
Zone Identifications
Sampledescriptionssimilar to theGamma Raylog
8/13/2019 Combining Gamma Ray Logs With Boring Logs
12/31
Zone Identifications
Sampledescriptionsdissimilarfrom theGammaRay log
8/13/2019 Combining Gamma Ray Logs With Boring Logs
13/31
Zone Identifications
Overlay ofGamma Raycurves forboring logswith similardescriptions
8/13/2019 Combining Gamma Ray Logs With Boring Logs
14/31
Potential Transport
Zones
Lower CPS zones
8/13/2019 Combining Gamma Ray Logs With Boring Logs
15/31
Potential Source
Zones Lower CPS zones with high OVM
values
Medium CPS zone with high OVMvalues
8/13/2019 Combining Gamma Ray Logs With Boring Logs
16/31
Non-Source Zones When dealing with risk
assessments, non-source zones
are: High CPS zones with high OVM values
Zones with low OVM values
8/13/2019 Combining Gamma Ray Logs With Boring Logs
17/31
Semi-Quantitative Analysis forCombined Gamma Ray and
Boring Logs
1. Identify bentonite seal
2. Identify the range without thebentontite seal
3. Identify potential transport intervals
4. Identify potential source intervals
8/13/2019 Combining Gamma Ray Logs With Boring Logs
18/31
1: Bentonite SealIdentification Gamma Ray log with bentonite seal
Gamma Ray log without bentoniteseal
Gamma Ray log with bentonite sealerroneously reported
8/13/2019 Combining Gamma Ray Logs With Boring Logs
19/31
Gamma Ray With Bentonite Seal
8/13/2019 Combining Gamma Ray Logs With Boring Logs
20/31
8/13/2019 Combining Gamma Ray Logs With Boring Logs
21/31
Gamma Ray Log With Bentonite
Seal Erroneously Reported
8/13/2019 Combining Gamma Ray Logs With Boring Logs
22/31
2: Identify the Range
8/13/2019 Combining Gamma Ray Logs With Boring Logs
23/31
3: Identify the Intervals
(20 and 50 )
8/13/2019 Combining Gamma Ray Logs With Boring Logs
24/31
4: Identify Potential Transport
and Source Intervals
8/13/2019 Combining Gamma Ray Logs With Boring Logs
25/31
Semi-Quantitative Transportand Continuing Source Zone
Potential transport zone isopach
map Potential source zone isopach map
Combined transport and sourceisopach map
8/13/2019 Combining Gamma Ray Logs With Boring Logs
26/31
Potential Transport Zone Isopach Map
8/13/2019 Combining Gamma Ray Logs With Boring Logs
27/31
Potential Source Zone Isopach Map
8/13/2019 Combining Gamma Ray Logs With Boring Logs
28/31
Combined Transport and
Source Isopach Map
What doesthis map dofor you?
Where do
you putyour effort?
8/13/2019 Combining Gamma Ray Logs With Boring Logs
29/31
Conclusions: Combining GammaRay and Boring Log Data
Allows mapping of potentialcontaminant zones Allows mapping of potential transport
zones Identifies contaminant source zones for
maps and cross-sections Leads to 3-D delineation models
idenitifying the area of concern
8/13/2019 Combining Gamma Ray Logs With Boring Logs
30/31
Questions???
8/13/2019 Combining Gamma Ray Logs With Boring Logs
31/31
Thank you Leonard Billingsley 405-521-3504
Frank Vernon 405-521-6719 [email protected]
mailto:[email protected]:[email protected]:[email protected]:[email protected]