Determination of Pore Pressure from Sonic Log: a Case Study on One of Iran Carbonate Reservoir Rocks
Author(s):
Abstract:
Pore pressureis defined as the pressure of the fluid inside the pore space of the formation, which is also known as the formation pressure. When the pore pressure is higher than hydrostatic pressure, it is referred to as overpressure. Knowledge of this pressure is essential for cost-effective drilling, safe well planning, and efficient reservoir modeling. The main objective of this study is to estimate the formation pore pressure as a reliable mud weight pressure using well log data at one of oil fields in the south of Iran. To obtain this goal, the formation pore pressure is estimated from well logging data by applying Eatons prediction method with some modifications. In this way, sonic transient time trend line is separated by lithology changes and recalibrated by Weakleys approach. The created sonic transient time is used to create an overlay pore pressure based on Eatons method and is led to pore pressure determination. The results are compared with the pore pressure estimated from commonly used methods such as Eatons and Bowerss methods. The determined pore pressure from Weakleys approach shows some improvements in comparison with Eatons method. However, the results of Bowerss method, in comparison with the other two methods, show relatively better agreement with the mud weight pressure values.
Keywords:
Language:
English
Published:
Iranian Journal of Oil & Gas Science and Technology, Volume:4 Issue: 3, Summer 2015
Pages:
37 to 50
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