Schlumberger

Evaluate Deepwater Reservoir Quality

Understanding reservoir matrix and fluid properties

A complete understanding of reservoir matrix and fluid properties, reservoir quality, producibility, and connectivity are important to meeting long-term, strategic production goals. Deepwater reservoirs are often thinly layered and highly laminated and the assessment of each is critical for decisions on completions. Carbonates in these reservoirs add matrix complexities such as fracture corridors and porosity and permeability variations.

Real-time reservoir evaluation during drilling operations

Advanced logging-while-drilling (LWD) services acquire high-quality data for real-time reservoir evaluation during drilling operations. These measurements include formation resistivity, porosity, permeability, and lithology, offering improved understanding of the reservoir matrix. Early evaluation helps to plan subsequent detailed wireline logging and fluids sampling programs.

Data from measurements of petrophysical properties are transmitted while drilling to facilitate timely decisions. Results can include lithology-independent porosity and continuous permeability.

With real-time imaging for structural features, interpreters can identify dipping beds, faults, and fractures that could potentially impact drilling performance. High-conductivity fractures can quickly drain drilling fluid, leading to total loss of circulation, which can precede well control problems. These data also aid decision making for completion design optimization.

Wireline openhole logging

A range of wireline openhole logging services delivers detailed formation evaluation to accurately characterize the reservoir. These services need to be designed for the high-pressure, high-temperature conditions often encountered in deep water. It is particularly important to configure the logging program to deliver the necessary reservoir information with an optimized number of runs in the borehole.

In addition to measurements needed to provide the scope with which to correctly determine the petrophysical properties of the reservoir and its fluid contents, a variety of geology-enabled tools provide the means to image sedimentary features and to define important reservoir geometries and reservoir structural parameters.

Wellsite data processing helps to make early decisions on further operations by providing lithology and matrix properties, including porosity, permeability, and saturation analysis.

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Detailed Reservoir Characterization

MicroScope HD High-Definition Imaging-While-Drilling Service
Analyze reservoir rocks and fluids through accurate measurements and characterization delivered while drilling or on wireline.
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Complete Volumetric Analysis Reveals Pay Zones in Sand-Shale Sequences

The proVISION Plus MR log helps characterize two additional laminated sand–shale sequences.Data showing thin-bed analysis in a deepwater sandstone reservoir.
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