Sensitivity Explorer – The Disruptive History Matching Tool
for Superior Results in Shorter Time

Revolutionise Your History Matching Workflow

Until now history matching was a trial-and-error process, often cumbersome and time consuming, especially for big and mature fields with many wells. The industry has therefore developed computer assisted history matching tools. These tools require enormous computing power and typically hundreds of iterations yet individual well match quality is often quite poor.

Our SenEx (Sensitivity Explorer) is different: It is smart, requires only 10 – 20 simulation runs and dramatically improves the quality of your history match. What typically took months can now be achieved in days. SenEx stands for innovation and technology. It reduces turnaround time, saves manpower, licensing costs and mitigates risk as investment decisions are based on better reservoir models.

SenEx has been developed continuously over more than a decade and successfully applied in numerous field studies on reservoirs in different parts of the world.

 Why SenEx?

  • Significantly reduces number of required simulation runs, CPU and simulator usage.
  • Saves time, money and manpower
  • Is easy to use
  • Generates geologically sound and consistent models
  • Preserves known geological features of the original model to a great extent
  • Works at the grid block level eliminating the need for “multiplier boxes”
  • Fits in any history matching workflow
  • Supports various black-oil reservoir simulators


SenEx has been successfully applied in numerous field studies on reservoirs in different parts of the world.

How It Works

Will SenEx improve your history match? Yes. Will it replace expert Reservoir Engineers? No.
But SenEx helps save experts’ time during matching freeing them up for other mission-critical tasks. Using SenEx is extremely easy and can fit into most history matching workflows. After each simulation run, SenEx generates new property arrays to be used in the next run leading to a significant improvement in every simulation run. This loop is repeated until a satisfactory match is finally reached. This approach saves time and money and considerably cuts the amount of human resources required. Compared to other tools that require hundreds of simulation runs, SenEx usually achieves a high quality match after 10 to 20 iterations.

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SenEx Base

The basic module for the sensitivity analysis


The graphical user interface providing the workflow, easy objective function definition and parameter specifications & modifications as well as a flexible auto-loop function

SenEx Dual

An additional module that allows dealing with dual porosity / dual permeability models including fracture porosity & permeability and matrix-fracture connections

The Future of History Matching – What Makes The Difference

Ordinary history matching tools compute sensitivities by repeatedly running the simulator while varying the parameters. The number of required simulation runs increases dramatically as the number of parameters to be evaluated is increased.

Contrary to other tools, SenEx treats every rock property at every grid block as individual parameters and analytically calculates how the properties affect the history match in a given simulation case. Based on these analytical sensitivities, SenEx captures what grid block properties need to be changed, where, and how, in order to improve the history match quickly. The changes are kept minimal: only as needed. This leads to geologically sound and consistent models.

SenEx provides the user with maps showing how the properties at each and every grid block affect the match. This indicates how the model needs to be modified in order to improve the history match; an exercise that would otherwise be a tough and tedious trial-and-error process.

Permeability variograms remain largely unchanged

Key Publications

SPE 131627:
History-Matching with Sensitivity-Based Parameter Modifications at Gridblock Level

Authors: Hussein Almuallim, Kelly Allan Edwards (Barrick Energy Inc), Leonhard Ganzer (Tech. U. Clausthal)

SPE 165979:
Computer Assisted History Matching – A Field Example

Authors: R. H. Lind (HOT Engineering), O. Allottai (Akakus Oil Operations), A. M. Gaaim (NOC Libya), H. Almuallim (Firmsoft Technologies)

Advanced Assisted History Matching of a Large Mature Oil Field Based on a Huge Number of Grid-Block Level Parameters and Saturation Functions.

Authors: Hussein Almuallim (HOT FirmSoft Solutions FZ-LLC), Leonhard Ganzer (HOT FirmSoft Solutions FZ-LLC), Hiroshi Uematsu (ADNOC Offshore), Samir Bellah (ADNOC Offshore), Viorel Virlan (ADNOC Offshore)

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