Schlumberger

The Reservoir View

Overview Technologies

Acquiring the right data

The decision to drill an exploration well requires the best structural image on which to base the well location. Acquiring the right data the first time is crucial in minimizing expenses and managing risk.

Surface seismic

Seismic acquisition techniques, such as broader bandwidth, wide and full azimuth, and dual-coil seismic surveys improve imaging in complex structures, such as carbonate rocks, laminated sands below salt, and basalt formations. New techniques to acquire seismic data from multiple directions and with multi-sensor acquisition help to illuminate such structures, providing higher definition images in the process.

Complementary measurements

While seismic reflections mainly respond to density and porosity to give structure, electromagnetic measurements are sensitive to pore-fluid resistivity and the resistivity of the rock matrix.

Combining data based on the measurement of seismic reflections with those based on resistivity contrasts and gravity, such as controlled-source electromagnetics or magnetotellurics, can detect broadscale resistivity anomalies in the subsurface.

Data processing and modeling

It may be necessary to reprocess existing seismic data or newly acquired data in order to proceed with the interpretation workflow. It may also be of interest to focus on specific areas of interest, e.g., reservoirs below dense or complex overburdens.

With advances in computer power it is now possible to integrate data from multiple sources for a more complete and efficient analysis of subsurface structures.

Geophysical solutions

Whenever data obtained from borehole measurements are available, these provide valuable information with which to calibrate depth-indexed acoustic and density measurements with time-indexed seismic.

Schlumberger experts integrate seismic and borehole data using ISIS simultaneous inversion software. The four-stage workflow involves wavelet extraction, static or dynamic inversion, rock physics, and reservoir modeling using ISIS simultaneous inversion software. The result is greater accuracy in reservoir characterization.

Geology and geological modeling

A model of the reservoir is constructed by combining all available information, from seismic to well data. Seismic data provide an understanding of the reservoir and overburden structure and well data deliver detailed information of rock and fluid properties. For geomechanical studies prior to drilling it is also necessary to understand the properties of the overburden. A model is used to simulate and predict reservoir behavior during production and is updated whenever new information is obtained.

Petrel seismic-to-simulation software integrates seismic surveys with LWD and MWD data and wireline logs to build a realistic model than can evolve through the life of the reservoir.

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Defining Complex Structures and Prospects

Defining Complex Structures and Prospects
A selection of recent articles and papers which discuss reservoir characterization technologies, workflows and software to reduce the uncertainty of exploration.
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UniQ System Delivers Superior Image Resolution

Oil and Gas Exploration Play, Identification and Evaluation
High-resolution data acquired using the UniQ integrated point-receiver land seismic system reveals structural details not previously visible in legacy seismic. Read case study

Electromagnetic Services Reduce Uncertainty

Oil and Gas Exploration Play, Identification and Evaluation
Electromagnetic services used in deep water, Gulf of Mexico, to image complex geological environments.
Read case study