On the definition of abnormally high reservoir pressures and the anomaly coefficient using the equivalent depth method

Abstract

The exploration of zones with abnormally high reservoir pressures in the Yamalo-Nenets and Khanty-Mansi Autonomous Okrugs has become essential due to the development of deep hydrocarbon fields. This has led to various technical challenges during reservoir exposing and testing. Elevated and high reservoir pressures are observed in nearly all hydrocarbon-bearing formations, starting from the cap rock of the Achimov sequence, extending through the Upper and Lower Jurassic deposits, and continuing down the geological section. Understanding elevated and high reservoir pressures, along with the mechanisms of their formation, is vital for enhancing the efficiency of deep drilling operations and preventing well control incidents. To address this, a variety of pressure evaluation methods are employed before, during, and after the drilling process. Geophysical methods used during drilling are particularly important for tackling this task.  

This study investigates the potential for determining reservoir pressure using data from wells drilled in multiple fields.  

It demonstrates how the equivalent depth method can be applied to estimate both reservoir pressure and the pressure anomaly coefficient. The results of the study show that this method provides reliable data when applied to the evaluation and testing of deep reservoirs.