Guideline for a Sonic Studio Model

Transcription

1 Sonic Studio Model Pg.1 Guideline for a Sonic Studio Model A model will be constructed to demonstrate a how to demonstrate how to use Sonic Studio in UTAPWeLS. The model will be created to represent soft and hard formations and the utilization of field data measurements for each condition. Model Setup: 1. Open a well:. a. The default measurement Meters will be used here. b. Right click in the Reference Track on the right side of the Well Interpreter. c. Specify Focus Interval: Top 1485; Bottom d. Specify Modeling Interval: Top 1500; Bottom e. Add a Petrophysical Bed Boundary at 1750m. i. This can be done with the Create New Petrophysical Boundary Mode Icon, or using a right mouse click at the measured distance and choose New Petrophysical Boundary. 2. Open the Detect Boundaries panel in the Earth Model Builder. a. Click on the Populate Properties tab. The following values are from field data: i. Borehole column 1. radius: Bulk Density (ρ B): 1 for water 3. P-Wave Slowness (V P): 189 ii. Zone 1 column 1. Bulk Density (ρ B): 2.15 (converted from 30PU) 2. P-Wave Slowness (V P): S-Wave Slowness (V S): 260 iii. Click Populate Properties and then Reset Master Curves to prevent changes then X-out. 3. In the Well Interpreter open the Track Editor a. Clicking on the Tracks icon b. or a left double click in the track. c. In Track 2 click the Add Log icon. i. Soft Formation values: ρ = φρ + (1 φ) ρ B f m ρb = 0.3(1) + (1 0.3)2.65 ρ = 2.15 B Type: Earth Model Property: P-Wave Slowness (Parallel or Homogenous). Zone: Formation (Uninvaded). Limits: 200 < 60. Type: Earth Model. Property: S-Wave Slowness (Parallel or Homogenous). Zone: Formation(Uninvaded). Limits: 300 < 140. Type: Earth Model Property: Bulk Density Zone: Formation (Uninvaded) Limits: 1.65 > 2.65 d. Hard formation from 1750m to 2000m. Right click on each log in the lower portion of the track and change the values to the following: i. DT P, Set P-Wave Slowness value: 90 ii. DT S, Set S-Wave Slowness value: 160 iii. ρ B, Set Bulk Density: 2.35 (18PU well log)

2 Sonic Studio Model Pg.2 For example: Modifying the P-Wave Slowness value : A right click on the DTp,t log opens this menu: All 3 values changed in the hard formation: The same were done for DTs,t and Bulk Density values. Sonic Studio: 4. Open the Sonic Studio module: a. The Sonic Studio icon menu bar: This will open the Sonic Tool Editor: Enter New Tool: Three available tools plus a New Tool can be created. Fill in the information for the Names, Type, etc. for the New Tool.

3 Sonic Studio Model Pg.3 b. Open the Simulation/Processing Settings window: Change Source: From ALL to Far Monopole Specific Depth: Soft: 1625 Hard: 1875 Give a name to this simulation and repeat for the 1875 Hard. c. The simulation can be started from the Simulate button, or the menu icon,. d. A command window will open and the simulation will run: The results from the simulations for both the Soft and Hard Formations:

4 Sonic Studio Model Pg.4 Modify the Plot: The scales of the plots can be changed: Frequency pre-scale change: Frequency post-scale change:

5 Sonic Studio Model Pg.5 # of Receivers. To increase/decrease the plot area: -Move the mouse to the side/bottom of the plot. -Double arrow enables the plot size to be increased or decreased. To increased/decreased the amplitude of the plots move the bar up/down. Amplitude change: Frequency Change: (From 8 khz to 14 khz) 5. To change the frequency of the tool open the Sonic Tool Editor, : -In the Sonic Tool(s), the first Far Monopole will be changed from 8 f C (khz) to 14 f C (khz):

6 Sonic Studio Model Pg.6 a. Run the simulation. b. Results: Note that the Shear waves are now seen: Soft formation 14 khz at 1625m: Hard formation 14 khz at 1875m: 6. Simulating with another Source: Open Sonic Tools, change the Far Monopole f c back to 8 khz and click OK. a. Open Simulation Settings. i. In Tools/Source choose Source: X-Dipole ii. In Save Results In, create New: 1625-X-Dipole iii. Click on Simulate. iv. The Waveform Set for 1625-X-Dipole displayed the Time and Frequency plots below. v. In Advanced Plot Options,. 1. Time was changed to 0 to Frequency was changed to 0 to 10. X-Dipole 4kHz at 1625m:

7 Sonic Studio Model Pg.7 To show more than one plot a simulation for each condition will need to be run under the same file name. For this example, Far Monopole and X-Dipole will be run at a Depth of 1625m. 1. In the Simulation Setting Panel: a. Choose your first source: Far Monopole. b. Specific Depth: c. In Save Results In, check New and create a file name, for example: 1625_Combo_FarMono_X-Dipole. d. Simulate. e. After the simulation is finished, choose the second Source, X-Dipole. f. In the Save Results click on Current and choose the 1625 Combo_FarMono_X-Dipole file. g. Simulate. h. The file will not have both simulation information which will enable viewing the plots together. 2. Different depths using the same file can also be created. a. This example, similar to the one above will use the Far Monopole tool and Simulate at 1625 and then 1875 m. b. When displaying, choose the Waveform Set and the Depth can be switched from 1625 to 1875:

8 Sonic Studio Model Pg.8 7. Slowness-Time-Coherence (STC) and Dispersion simulation for Far Monopole: Far Monopole 8kHz; STC & Frequency Dispersion at 1625m Far Monopole 8kHz; STC & Frequency Dispersion at 1875m 4 Far Monopole 14kHz; STC & Frequency Dispersion at 1625m Far Monopole 14kHz STC & Frequency Dispersion at 1875m

9 Sonic Studio Model Pg.9 8. Slowness-Time-Coherence (STC) and Dispersion simulation for X-Dipole: (Black was chosen as the color for the images below instead of red used in examples of the X-dipole above.) X-Dipole 4kHz; STC & Frequency Dispersion at 1625m X-Dipole 4kHz; STC & Frequency Dispersion at 1875m X-Dipole 6kHz; STC & Frequency Dispersion at 1625m X-Dipole 6kHz; STC & Frequency Dispersion at 1875

10 Sonic Studio Model Pg.10 X-Dipole 10kHz; STC & Frequency Dispersion at 1625m X-Dipole 10kHz; STC & Frequency Dispersion at 1875m