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- W1576707923 abstract "Advances in NMR technology applied to logs and core have resulted in a number of measurements that aid in building and interpreting petrophysical models in tight gas sands (TGS). This paper deals with four different measurements and concepts that were used to aid in determining both gas in place and the producibility of the gas. One of the more important of these is the measurement (in both T 2 and T 1 space) of the volume of clay bound water (V CBW ). It is shown that this measurement is used to determine R wb , V sh , φ e , and CEC. A second NMR measurement that can be made using T 2 and/or T 1 distributions is S wi (or BVWI), which leads to identifying the presence of free water in the reservoir, and to develop permeability transforms. It is shown that in these TGS reservoirs the T 1 signal separates out gas from liquid. As a result, when the gas composition and pressure/temperature are known, hydrogen index corrections can be made to this signal to determine gas volume in the invaded zone. Combining this volume with the liquid signals gives a direct measurement of φ 1 . A fourth measurement that can be made with the T 1 distributions is a determination of S xo . NMR based S xo measurements are particularly important since resistivity model estimates of S xo are inherently inaccurate, especially in low permeability rock." @default.
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- W1576707923 date "2009-04-01" @default.
- W1576707923 modified "2023-09-25" @default.
- W1576707923 title "NMR Log/Core Data In Tight Gas Sand Petrophysical Model Development" @default.
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