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A Novel Method to Construct Capillary Pressure Curves by Using NMR Log Data and Its Application in Reservoir EvaluationNormal access

Authors: L. Xiao, Y. Yuan and Z. Chen
Event name: IPTC 2008: International Petroleum Technology Conference
Session: Meeting the Energy Needs of a Growing World Economy
Publication date: 03 December 2008
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 313.69Kb )
Price: € 20

By analyzing hundreds of capillary pressure curves, the controlling factors of shape and type of capillary pressure curves are
found and a novel method is presented to construct capillary pressure curves by using reservoir permeability and a synthesized
index. The accuracy of this new method is verified by mercury-injection experiments. Considering the limited quantity of
capillary pressure data, a new method is developed to extract the Swanson parameter from the NMR T2 distribution and
estimate reservoir permeability. Integrating with NMR total porosity, reservoir capillary pressure curves can be constructed,
which could be used to evaluate reservoir pore structure and calculate reservoir originality water saturation in the intervals
with NMR log data. At last, the constructed NMR capillary pressure curve by this new method is used in well site to detect the
change in reservoir pore structure and initial water saturation as a function of depth, comparision among the calculated result,
core data and Archie water saturation, demonstrate the responsibility and accuracy.

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