Using Vp/Vs Ratio to Predict Fluid Type in oil reservoirs a case study from an oil field, southwest of iran

Publish Year: 1389
نوع سند: مقاله کنفرانسی
زبان: English
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تاریخ نمایه سازی: 3 آبان 1389

Abstract:

the compressional wave velocity is a key foe lithology and porosity prediction in petrophysical analysis sonic logs. Shear wave velocity is very useful in determing mechanical rock properties . In oil and gas reservoirs compressional wave velocity decreases and shear wave velicity increases. the increase of shear wave velocity is due to the decrease of density and the absorption of deformation by oil in pores and the decrease of compressional wave velocity is due to the decrease of bulk modulus of reservoir rocks; therefore the Vp to Vs ratio, Vp/Vs, will decrease and it is more sensitive to change of fluid type than Vp or Vs separately. the use of Vp/Vs is a key parameter in reservoir study and it plays a key role especially for lithology and fluid type prediction methods. a field example in southwest of iran is given to identify fluids type water and oil using the Vp/Vs ration form well logs . the results have shown that shear wave velosity increases and compressional wave velocity decreases when the water saturated points become oil saturated points in the studied intervals.

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Authors

m bahremandi

division of reservoir studies

m keramati

division of reservoir studies

m mirshahani

division of reservoir studies