LAS
Need complete-curve LAS? TGS digitizes 12-curve suites to provide the best data to customers and continues to add to the online database.
Discover LASThe LAS+ log curve set provides the best open hole curve data available for a given well, depth shifted geologically valid curve data that has been edited to remove sections of data adversely affected by drilling or logging (e.g. tool failures, computer glitches, tool pulls, logging drum magnetization). Petrophysicists, Geologists and Geophysicists can work confidently with LAS+ processed curve data that has been quality controlled by our specialists, who have strong backgrounds in geoscience, well logging, and data management.
The entire wellbore system is validated to ensure
A standard LAS+ curve suite will consist of all available gamma ray, spontaneous potential, caliper, resistivity, conductivity, sonic, density, density correction, neutron, tension
Using the edited curves, bearing the original logging contractor mnemonics with the “ED” suffix, key curve types are identified, merged if necessary and given generic well log curve mnemonics with a “WS” suffix to ease identification. Like curves from multiple run/logs are merged to provide a single curve with maximum depth coverage. For example, a GRWDED covering the shallower portion of a well would be merged with a GRDED covering the deeper portion of the well. The resultant curve would be called GRWS. Key curve types from the “ED” curves are duplicated and renamed with generic mnemonic. The curve descriptions are added to each curve under the Curve Information section in the LAS+ header.
* indicates type of Formation Matrix, either Sandstone (SS), Limestone (LS) or Dolomite (DL)
SPWS | Spontaneouse Potential | MV |
GRWS | Gamma Ray | GAPI |
DRESWS | Deep Resistivity | OHMM |
MRESWS | Medium Resistivity | OHMM |
SRESWS | Shallow Resistivity | OHMM |
CONDWS | Conductivity | MMHO |
DENWS | Formation Bulk Density | G/CM3 or KG/M3 |
DPO*WS | Density Porosity | V/V |
DCORWS | Density Correction | G/CM3 or KG/M3 |
NPO*WS | Neutron Porosity | V/V |
NEWTWS | Neutron | NAPI or from old GRN log |
PEFWS | Photoelectric Factor | B/E |
DTWS | Sonic, Compressional | US/F or US/M |
DTSWS | Sonic, Shear | US/F or US/M |
SPO*WS | Sonic Porosity | V/V |
CALWS | Caliper | IN or MM |
ROPWS | Rate of Penetration | FT/HR or M/HR |
The standardized TGS generic WS mnemonics can simplify the workstation environment by allowing the interpreter to use one template, minimizing the complexity associated with multiple logging contractors' mnemonics.
Process Comparison | LAS | LAS + |
---|---|---|
LAS version | 2.0 | 2.0 |
Header Info | ||
Wire-line logging - all standard curves | ||
LWD - only in the absence of WL standard curves | ||
Quality Control vs. Raster | ||
Quality Control - Geological QC | ||
Depth Shifted | ||
Calculated curves | ||
Casing Shoe clean-up | ||
SP baselined | ||
Tool pull QC | ||
Reading Logging Remarks | ||
Compose like Curve class for max coverage | ||
Standardized Units | ||
Normalized Mnemonics |
TGS has the largest library of immediately available processed well logs in the industry, workstation-ready for correlation, mapping, petrophysical evaluation, and complex integrated analysis.
Need complete-curve LAS? TGS digitizes 12-curve suites to provide the best data to customers and continues to add to the online database.
Discover LAS