Influences of Al, Mg, and K on Calculating Concentrations of Other Formation Elements and Their Corrections in Geochemical Logging

• Autorzy: Wu W. , Tong M. , Niu W. , Luo L.

Identyfikatory

DOI

10.1515/acgeo-2015-0004

• Języki publikacji: EN

Abstrakty

EN

In geochemical logging, the standard capture gamma-ray spectra of Al, Mg, and K have no distinct characteristic energy peaks. This feature easily influences the spectral bands of characteristic peaks of other elements and thus affects the accuracy of calculating their concentrations. To study this influence, we constructed a model formation containing Al, Mg, and K, and employed the Monte Carlo N Particle Transport Code (MCNP) program to simulate their capture spectra. The results indicate that the calculated dry weights of Si are almost free from the influences of Mg, K, and Al. The ones of Ca and Fe are influenced, but only to a minor extent. The dry weight of S is concurrently influenced. Specifically, the K concentration causes S concentration to deviate significantly from its real concentration. By correcting for such influences, we can obtain relatively accurate values. Data processing for a real well validates the finding that Mg, Al, and K in the formation influence the precision of calculation of other elements and also testifies to the effectiveness of the correction method.

Słowa kluczowe

EN

geochemical elemental logging; spectral stripping; elemental concentration

PL

geochemia; stężenie pierwiastków; promieniowanie gamma; analiza spektralna

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2015
• Tom: Vol. 63, no. 2
• Strony: 451--467
• Opis fizyczny: Bibliogr. 13 poz., tab., wykr.

Twórcy

autor

Wu W.

• State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, China

autor

Tong M.

• Daqing Drilling Corporation, PetroChina, Daqing, China

autor

Niu W.

• State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, China

autor

Luo L.

• CCDC Well Logging Company, Chongqing, China

Bibliografia

• [1] Chapman, S., J.L. Colson, B. Everett, C. Flaum, M.M. Herron, R.C. Hertzog, G. Pirie, H. Scott, J.S. Schweitzer, J. La Vigne, J. Querein, and R. Wendlandt (1987), The emergence of geochemical well logging, Tech. Rev. 35, 2, 27-35.
• [2] Ellis, D.V., and J.M. Singer (2008), Well Logging for Earth Scientists, 2nd ed. Springer, Dordrecht.
• [3] Galford, J.E., J.A. Quirein, S. Shannon, J.A. Truax, and J. Witkowsky (2009), Field test results of a new neutron-induced gamma-ray spectroscopy geochemical logging tool. In: Proc. SPE Ann. Technical Conference and Exhibition, 4-7 October, 2009, New Orleans, USA, Society of Petroleum Engineers, DOI:10.2118/123992-MS.
• [4] Grau, J.A., and J.S. Schweitzer (1989), Elemental concentrations from thermal neutron capture gamma-ray spectra in geological formations, Nucl. Geophys. 3, 1, 1-9.
• [5] Helmer, R.G., R.L. Heath, L.A. Schmittroth, G.A. Jayne, and L.M. Wagner (1967), Analysis of gamma-ray spectra from NaI(Tl) and Ge(Li) spectrometers. Computer programs, Nucl. Instrum. Methods 47, 2, 305-319, DOI: 10.1016/0029-554X(67)90445-4.
• [6] Herron, M.M. (1986), Mineralogy from geochemical well logging, Clays Clay Miner. 34, 2, 204-213, DOI: 10.1346/CCMN.1986.0340211.
• [7] Herron, M.M., S.L. Herron, J.A. Grau, N.V. Seleznev, J. Philips, A. El Sherif, S. Farag, J.P. Horkowitz, T.J. Neville, and H. Kai (2002), Real-time petrophysical analysis in siliciclastics from the integration of spectroscopy and triple-combo logging. In: Proc. SPE Ann. Technical Conference and Exhibition, 29 September – 2 October 2002, San Antonio, USA, Society of Petroleum Engineers, DOI: 10.2118/77631-MS.
• [8] Herron, S.L., and M.M. Herron (1996), Quantitative lithology: An application for open and cased hole spectroscopy. In: SPWLA 37th Ann. Logging Symp., 16-19 June 1996, New Orleans, USA, Society of Petrophysi- cists and Well-Log Analysts, SPWLA-1996-E, 14 pp.
• [9] Hertzog, R., L. Colson, O. Seeman, M. O’Brien, H. Scott, D. McKeon, P. Wraight, J. Grau, D. Ellis, J Schweitzer, and M. Herron (1989), Geochemical logging with spectrometry tools, SPE Formation Eval. 4, 2, 153-162, DOI: 10.2118/16792-PA.
• [10] Pang, J.F. (1991), γ-Ray Spectrum Data Analysis, Shanxi Science & Technology Press, Xi’an (in Chinese).
• [11] Pemper, R.R., A. Sommer, P. Guo, D. Jacobi, J. Longo, S. Bliven, E. Rodriguez, F. Mendez, and X. Han (2006), A new pulsed neutron sonde for derivation of formation lithology and mineralogy. In: Proc. SPE Ann. Technical Conference and Exhibition, 24-27 September 2006, San Antonio, USA, Society of Petroleum Engineers, DOI: 10.2118/102770-MS.
• [12] Radtke, R.J., M. Lorente, B. Adolph, M. Berheide, S. Fricke, J. Grau, S. Herron, J. Horkowitz, B. Jorion, D. Madio, D. May, J. Miles, L. Perkins, O. Philip, B. Roscoe, D. Rose, and Ch. Stoller (2012), A new capture and inelastic spectroscopy tool takes geochemical logging to the next level. In: SPWLA 53rd Ann. Logging Symp., 16-20 June 2012, Cartagena, Colombia, Society of Petrophysicists and Well-Log Analysts, SPWLA-2012-103, 16 pp.
• [13] Sweezy J.E., T.E. Booth, and F.B. Brown (2004), MCNP-A general Monte Carlo N-particle transport code. Version 5, MCNP user manual, LA-UR-03-1987, Los Alamos National Laboratory, Los Alamos, USA.