Characteristics of the Micro-Nanopore System in a Pelitic Dolomite Reservoir: A Case Study of the Lower Cretaceous Xiagou Formation in the Qingxi Depression Based on Nuclear Magnetic Resonance Experiments.

Journal of Nanoscience and Nanotechnology
Weifeng SunYong Qin

Abstract

The Lower Cretaceous Xiagou Formation is an important tight oil reservoir in the Qingxi Depression of the Jiuxi Basin. The micro-nanopore system within the reservoir requires a comprehensive analysis to improve the production of tight oil there. Nuclear magnetic resonance (NMR) experiments have been widely used for the petrophysical characterization of sandstones and carbonates. In the present study, the NMR experiment was applied to obtain the characteristics of the micro-nanopore system and permeability in the Lower Cretaceous Xiagou pelitic dolomite reservoir. According to the distribution shape of the transversal relaxation time (T₂) obtained under the 100% water-saturated condition (Sw), the samples are divided into four groups: (i) group I, two obvious peaks (P1 and P2); (ii) group II, an obvious high peak of P1 at 0.1˜1.0 ms and a relatively low peak of P2; (iii) group III, an obvious high peak of P2 and a relatively low peak of P1; and (iv) group IV, three peaks. In general, the distribution shape of T₂ under the initial condition (Sini) is unimodal, with all its peaks lower than those under the Sw condition. The NMR T₂ spectrum reflects the distribution of the rock pore radius. Most of the pore radius distributions are...Continue Reading

References

Jan 1, 1996·Magnetic Resonance Imaging·D MardonG R Coates
Dec 3, 2014·Journal of Magnetic Resonance·Kathryn E WashburnSarah L Codd

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