Magnetic and mineralogical characteristics of reservoir rocks in the Yakela oil field, northern Tarim Basin and their implica- tions for magnetic detection of oil and gas accumulations

摘要

The evidence about hydrocarbon migration with reservoir rocks in two wells has been ob- tained according to results of magnetic and mineralogical analysis of the Kapushaliang Group reservoir rocks from wells S_15 and S_4 located at the Yakela oil field, Tarim Basin. Results show that the sec- ondary 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 conditions in situ.