Magnetic and mineralogical characteristics of reservoir rocks in the Yakela oil field, northern Ta rim Basin and their implications for magnetic detection of oil and gas accumulations
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The evidence about hydrocarbon migration within reservoir rocks in two wells has been obtained according to results of magnetic and mineralogical analysis of the Kapushaliang Group reservoir rocks from wells S15 and S4 located at the Yakela oil field, Tarim Basin. Results show that the secondary alteration associated with oil and gas accumulations above oil and gas field is predominantly magnetite mineralization, and that sulfur alteration occurs commonly at oil-water boundary and their products are generally pyrite and pyrrhotite, except for magnetite alteration which is closely related with hydrodynamical conditionsin situ. The spherical magnetite grains of cauliflower microtexture on surface extracted from oil-bearing cores are secondary magnetite related with hydrocarbon microseepage and their diameters are usually less than 50 μm.
Keywordshydrocarbon microseepage magnetic mineralogy magnetic hysteresis loop thermal magnetic analysis reservoir petrophysics
- 6.Liu Qingsheng, A study for relationship between hydrocarbon migration and soil magnetism above oil and gas fields in China,Chinese J. Geophysics, 1997, 40: 65.Google Scholar
- 8.Liu Qingsheng,The Basic Principle and Applications of Micromagnetic Method in Oil and Gas Exploration (in Chinese), Wuhan: China University of Geosciences Press, 1996.Google Scholar
- 10.Wasilewski, P., Magnetic properties of mantle xenoliths and the magnetic character of the crust-mantle boundary, inMantle Xenoliths (ed. Nixon, P. H.), New York: John Wiley & Sons Ltd., 1987, 577–588.Google Scholar
- 11.Dortman, N. B.,Physzcal Properties of Rocks and Minerals, Moscow: Mining Industry Press, 1976.Google Scholar