Pore pressure prediction using seismic velocity modeling: case study, Sefid-Zakhor gas field in Southern Iran

Journal of Petroleum Exploration and Production Technology

Erfan Hosseini¹  Zahra Bahmaei² 

[1] Petroleum Engineering Department, Sarvak Azar Engineering and Development Company (SAED), Oil Industries Engineering and Construction Company (OIEC Group);Physics Department, Faculty of Science, Shahid Chamran University of Ahvaz;

关键词: Pore pressure;    Sefid-Zakhor;    Seismic;    Inversion;    Check shot;    Resolution;   

DOI  :  10.1007/s13202-019-00818-y

来源: DOAJ

【 摘 要 】

Abstract Pore pressure estimation is important for both exploration and drilling projects. During the exploration phase, a prediction of pore pressure can be used to evaluate exploration risk factors including the migration of formation fluids and seal integrity. To optimize drilling decisions and well planning in abnormal pressured areas, it is essential to carry out pore pressure predictions before drilling. Mud weight and fracture gradient are essential parameters to have wellbore stability, prevent blowout, lost circulation, kick, sand production and reservoir damages. Predrill pore pressure accurate prediction allows the appropriate mud weight to be selected and allows the casing program to be optimized, thus enabling safety by preventing wellbore collapse and economic drilling by reducing the cost. The goal of this study is to estimate pore pressure relation with subsurface velocity in the Sefid-Zakhor gas field. Manufactured sonic logs are modified using the check shot interval velocity of Sefid-Zakhor well No. 1. The final acoustic impedance model is converted to the velocity model by removing density. Finally, the velocity model is converted to pore pressure using Bowers (in: IADC/SPE drilling conference proceedings, 1995) relation. The results of the pore pressure model are validated by pore pressure data obtained by the MDT well test tool. Generally, the results show the normal trend for pore pressure in the area, except in the left side of the anticline in the 2D seismic section, because of tectonic uplifting.

【 授权许可】

Unknown