Earth Models

Earth Models

CHALLENGE
Earth models form the foundation for understanding of the reservoir and are used for all manner of E&P activities such as exploration evaluation, well planning, frac modelling, reservoir simulation, etc… These models necessarily require the most comprehensive data to most accurately represent reservoir heterogeneity for business decisions. However, when it comes to fundamental geomechanical properties, the data in these models is often sparse and incomplete due to the complexity in handling input data. First and foremost, data from the field logs must be QC’d – this is very often a problem when it comes to sonic data and most particularly shear data where expertise of the acquisition/QC process is limited. Then the problem of anisotropy comes into play when dealing with the various well geometries as both horizontal and vertical well data should all be included in models.   In order to obtain complete models, geomechanical properties can be derived for wells without running open hole logging tools via Quantico’s QFrac process.  Incorporating seismic evaluation into Earth Models is increasingly gaining traction as seismic inversion technology improves, but again requires specific expertise to evaluate when and how this should be done. Finally, updating/maintaining the models as new wells are drilled or new data is obtained can be a difficult chore.

SOLUTION
Quantico leveraged its experience with a wide variety of geological settings and its vast library of well data – with more horizontal logging and drilling data than possessed by virtually any single oil and gas company – to develop workflows for integrated geomechanical Earth Model generation. Experience shows that lateral variability should be taken into account when modelling reservoirs. Horizontal wells in particular provide a means to assess a reservoir in much higher resolution. A typical horizontal well has approximately 20-40 times more samples in the target zone than a corresponding vertical well and with large lateral coverage. Quantico can work closely with client personnel (i) to economically obtain geomechanical properties on a large volume of horizontal wells, and (ii) to provide fit-for-purpose expertise to assist or build/maintain these models for clients in their native Earth Model system or provide new models in any desired format.

VALUE
Deciding if a given area is worthy of development, deciding on a well path, or determining frac design are all big decisions – with potential impact in the millions to hundreds of millions of dollars. Providing an operational process with all the necessary expertise to dependably deliver a complete, timely, accurate geomechanical Earth Model to the customer ensures these key decisions are made optimally.