Magnetic enhancement caused by hydrocarbon migration in the Mawangmiao Oil Field, Jianghan Basin, China


Liu, Q.S., Liu, Q-S., Chan, L.S., Yang, T., Xia, X.H. and Cheng, T.J. (2006) Magnetic enhancement caused by hydrocarbon migration in the Mawangmiao Oil Field, Jianghan Basin, China. Journal of Petroleum Science and Engineering, 53, (1-2), 25-33. (doi:10.1016/j.petrol.2006.01.010).

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Description/Abstract

Magnetic parameters (volume-specific susceptibility κ, and hysteresis parameters and ratios) of 47 samples, collected from an oil-producing well (M36) and a dry well (M46) from the oil-bearing II-You Formation of Paleogene Xingouzui Group in the Mawangmiao Oil Field in China, were measured to address the secondary alteration of iron-bearing minerals associated with hydrocarbon migration. Our results indicated that both κ and magnetization (saturation magnetization Js and saturation isothermal remanent magnetization Jrs) of oil-bearing formation have been dramatically enhanced. Further grain size estimation reveals that the background samples (samples both in M46 and outside the oil-bearing formation in M36) contain coarser-grained magnetic particles (30 μm) of detrital origin. In contrast, the alteration of hydrocarbon produces finer-grained (25 nm) magnetic particles. The new constraints on grain sizes and its origin of the hydrocarbon-related magnetic particles improve our understanding of the mechanism of formation of these secondary finer-grained particles, even though the precise nature of this process is still unknown.

Item Type: Article
ISSNs: 0920-4105 (print)
Related URLs:
Keywords: Rock magnetism; Hydrocarbon alteration; Mawangmiao Oil Field, China
Subjects: Q Science > QE Geology
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 49744
Date Deposited: 27 Nov 2007
Last Modified: 27 Mar 2014 18:33
URI: http://eprints.soton.ac.uk/id/eprint/49744

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