Evaluation of laminated shaly sand sequences in Ahwaz oil field using (via) Thomas Stieber method and conventional petrophysical logs

Abstract

Thin layers of sand between shale formations can produce hydrocarbons if the layers are studied well. These layers are often ignored because of low thickness of layers and low resolution of conventional petrophysical logging tools in conventional methods. These tools only calculate the average properties of these layers, which makes a wrong prediction of amount of oil and gas in layers. If the thin laminated shaly sand is identified accurately and the petrophysical parameters are calculated carefully, there will be some methods to analyze the layers better which results in enhancing the production of reservoir.In this paper laminated shaly sand layers (LSS) are studied by using Thomas Stieber model and conventional petrophysical logs. Thomas Stieber model was applied to the desired layer by laminated shaly sand analysis module in Geolog 7.2 software and the results of the model and conventional petrophysical logs were analyzed by using this software. Finally, by comparing the results of the analysis, it was concluded that Thomas Stieber model calculates properties of laminated shaly sand layers more accurately than the conventional petrophysical logs and this model can be used in the study of these sequences.