Evaluation of water saturation in the low-resistivity reservoirs of Te Giac Trang Field
Abstract
Te Giac Trang is one among a series of oil fields in the Cuu Long basin which were discovered in the low-resistivity Lower Miocene sequences. Evaluation of the water saturation of pay sands in Te Giac Trang’s reservoirs has been a challenge to geologists and petrophysicists. It is believed that low resistivity is a resulting effect of many factors such as thin beds, the low degree of sand compaction, the presence of highly conductive minerals, e.g. pyrite, and montmorillonite that significantly increases the surface conductivity. In the Te Giac Trang field, the traditional shaley sand model and modified Archie equation constants have been used to calculate water saturation. The said method combined with the results of pressure pre-test allows us to enhance the accuracy of water saturation calculation for those low-resistivity pay sands.
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