The Estimation Method of T^sub 2cutoff^ Value for Basin Marine Facies Carbonate Cores Based on Fractal Theory
Transverse relaxation time cutoffvalue (T2cutoff) is one of the most important parameters for nuclear magnetic resonance (NMR) logging. However, traditional experimental methods to determine the T2cutoff value are timeconsuming, troublesome and expensive. In this paper, the proposed method derived f...
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| Veröffentlicht in: | Journal of coastal research 2018-01, Vol.SI (83), p.287-294 |
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| creator | Deng, Haoyang Sima, Liqiang Zhang, Fengsheng Liu, Fanglin Wu, Wen Sui, Xiuying Wang, Xin |
| description | Transverse relaxation time cutoffvalue (T2cutoff) is one of the most important parameters for nuclear magnetic resonance (NMR) logging. However, traditional experimental methods to determine the T2cutoff value are timeconsuming, troublesome and expensive. In this paper, the proposed method derived from fractal theory and Coates model helps to easily get the estimation value of T2cutoff only on the condition of brine-saturated NMR T2 spectrum. To verify the accuracy, experiments of NMR, X-ray and centrifugation have been finished on the basin marine facies carbonate cores from Syria. We find that the method not only distinguishes clay and capillary bound fluid information on the T2 spectra but also effectively estimate the T2cutoff values whose errors less than 8%. Calcite, clay, dolomite and quartz show complex influence on movable porosity derived from T2cutoff estimation. Clay and movable porosity is the reason to porosity varying little but permeability varying a lot. |
| doi_str_mv | 10.2112/SI83-047.1 |
| format | Article |
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However, traditional experimental methods to determine the T2cutoff value are timeconsuming, troublesome and expensive. In this paper, the proposed method derived from fractal theory and Coates model helps to easily get the estimation value of T2cutoff only on the condition of brine-saturated NMR T2 spectrum. To verify the accuracy, experiments of NMR, X-ray and centrifugation have been finished on the basin marine facies carbonate cores from Syria. We find that the method not only distinguishes clay and capillary bound fluid information on the T2 spectra but also effectively estimate the T2cutoff values whose errors less than 8%. Calcite, clay, dolomite and quartz show complex influence on movable porosity derived from T2cutoff estimation. Clay and movable porosity is the reason to porosity varying little but permeability varying a lot.</description><identifier>ISSN: 0749-0208</identifier><identifier>EISSN: 1551-5036</identifier><identifier>DOI: 10.2112/SI83-047.1</identifier><language>eng</language><publisher>Fort Lauderdale: Allen Press Inc</publisher><subject>Adsorption ; Brines ; Calcite ; Carbonates ; Centrifugation ; Centrifuging ; Clay ; Cores ; Dolomite ; Dolostone ; Engineering ; Experimental methods ; Experiments ; Fractal models ; Fractals ; Geophysics ; Laboratories ; Logging ; Magnetic permeability ; Methods ; Natural gas ; NMR ; Nuclear magnetic resonance ; Permeability ; Porosity ; Relaxation time ; Research methodology ; Saline water ; Sedimentary facies ; Stone ; X ray spectra</subject><ispartof>Journal of coastal research, 2018-01, Vol.SI (83), p.287-294</ispartof><rights>Copyright Allen Press Publishing Services 2018</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Deng, Haoyang</creatorcontrib><creatorcontrib>Sima, Liqiang</creatorcontrib><creatorcontrib>Zhang, Fengsheng</creatorcontrib><creatorcontrib>Liu, Fanglin</creatorcontrib><creatorcontrib>Wu, Wen</creatorcontrib><creatorcontrib>Sui, Xiuying</creatorcontrib><creatorcontrib>Wang, Xin</creatorcontrib><title>The Estimation Method of T^sub 2cutoff^ Value for Basin Marine Facies Carbonate Cores Based on Fractal Theory</title><title>Journal of coastal research</title><description>Transverse relaxation time cutoffvalue (T2cutoff) is one of the most important parameters for nuclear magnetic resonance (NMR) logging. However, traditional experimental methods to determine the T2cutoff value are timeconsuming, troublesome and expensive. In this paper, the proposed method derived from fractal theory and Coates model helps to easily get the estimation value of T2cutoff only on the condition of brine-saturated NMR T2 spectrum. To verify the accuracy, experiments of NMR, X-ray and centrifugation have been finished on the basin marine facies carbonate cores from Syria. We find that the method not only distinguishes clay and capillary bound fluid information on the T2 spectra but also effectively estimate the T2cutoff values whose errors less than 8%. Calcite, clay, dolomite and quartz show complex influence on movable porosity derived from T2cutoff estimation. Clay and movable porosity is the reason to porosity varying little but permeability varying a lot.</description><subject>Adsorption</subject><subject>Brines</subject><subject>Calcite</subject><subject>Carbonates</subject><subject>Centrifugation</subject><subject>Centrifuging</subject><subject>Clay</subject><subject>Cores</subject><subject>Dolomite</subject><subject>Dolostone</subject><subject>Engineering</subject><subject>Experimental methods</subject><subject>Experiments</subject><subject>Fractal models</subject><subject>Fractals</subject><subject>Geophysics</subject><subject>Laboratories</subject><subject>Logging</subject><subject>Magnetic permeability</subject><subject>Methods</subject><subject>Natural gas</subject><subject>NMR</subject><subject>Nuclear magnetic resonance</subject><subject>Permeability</subject><subject>Porosity</subject><subject>Relaxation time</subject><subject>Research methodology</subject><subject>Saline water</subject><subject>Sedimentary 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However, traditional experimental methods to determine the T2cutoff value are timeconsuming, troublesome and expensive. In this paper, the proposed method derived from fractal theory and Coates model helps to easily get the estimation value of T2cutoff only on the condition of brine-saturated NMR T2 spectrum. To verify the accuracy, experiments of NMR, X-ray and centrifugation have been finished on the basin marine facies carbonate cores from Syria. We find that the method not only distinguishes clay and capillary bound fluid information on the T2 spectra but also effectively estimate the T2cutoff values whose errors less than 8%. Calcite, clay, dolomite and quartz show complex influence on movable porosity derived from T2cutoff estimation. Clay and movable porosity is the reason to porosity varying little but permeability varying a lot.</abstract><cop>Fort Lauderdale</cop><pub>Allen Press Inc</pub><doi>10.2112/SI83-047.1</doi></addata></record> |
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| subjects | Adsorption Brines Calcite Carbonates Centrifugation Centrifuging Clay Cores Dolomite Dolostone Engineering Experimental methods Experiments Fractal models Fractals Geophysics Laboratories Logging Magnetic permeability Methods Natural gas NMR Nuclear magnetic resonance Permeability Porosity Relaxation time Research methodology Saline water Sedimentary facies Stone X ray spectra |
| title | The Estimation Method of T^sub 2cutoff^ Value for Basin Marine Facies Carbonate Cores Based on Fractal Theory |
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