Structural Interpretation of Yamama and Naokelekan Formations in Tuba Oil Field Using 2D Seismic Data

Belal M Odeh

doi:10.46717/igj.54.2b.5ms-2021-08-25

Abstract

This research includes structure interpretation of the Yamama Formation (Lower Cretaceous) and the Naokelekan Formation (Jurassic) using 2D seismic reflection data of the Tuba oil field region, Basrah, southern Iraq. The two reflectors (Yamama and Naokelekan) were defined and picked as peak and tough depending on the 2D seismic reflection interpretation process, based on the synthetic seismogram and well log data. In order to obtain structural settings, these horizons were followed over all the regions. Two-way travel-time maps, depth maps, and velocity maps have been produced for top Yamama and top Naokelekan formations. The study concluded that certain longitudinal enclosures reflect anticlines in the east and west of the study area representing Zubair and Rumaila fold confined between them a fold consist of two domes represents Tuba fold with the same trending of Zubair and Rumaila structures. The study confirmed the importance of this field as a reservoir of the accumulation of hydrocarbons.

Highlights

There is through its high analytical capacity and ability to give a close picture to the subsurface geological situation, delineation the type of the oil traps with a good estimation of the reservoir characterizations (Telford et al, 1990; Lines and Newrick, 2004; Al-Sadi, 2017; Awadh et al, 2018; Awadh et al, 2019; Awadeesian et al, 2019)
Interpretation includes a description of the seismic sections, identify the target reflectors and horizons, their quality, continuity of the reflectors and create two-way time maps, velocity maps, and depth maps to recognize any seismic structures features that may help in interpretation
There is a difference in the direction of velocity between the Yamama and Naokelekan formations due to the difference in the age of the basin

Summary

Introduction

There is through its high analytical capacity and ability to give a close picture to the subsurface geological situation, delineation the type of the oil traps (structural, stratigraphic) with a good estimation of the reservoir characterizations (porosity, lithofacies, fluid content and water saturation) (Telford et al, 1990; Lines and Newrick, 2004; Al-Sadi, 2017; Awadh et al, 2018; Awadh et al, 2019; Awadeesian et al, 2019). The main steps of the seismic reflection method are the acquisition field seismic data, processing interpretation to get an image, which closes, to the real subsurface geology. Interpretation of 2D seismic data of one of the important oilfields in Iraq named Tuba oil field. The Tuba oil field was discovered in 1960 as one of the most oil fields in the Mesopotamian basin. The Mishrif Formation, which makes up about 65% percent of, the extraction rate, is the main reservoir of carbonates in Tuba oil field (Oil Exploration Company, 2013). The main goal of this, article is to interpret the 2D seismic data and the logs of the well of Tuba oil field in order to get an image of the subsurface structure

Methods

Results

Conclusion