Abstract
The West Qurna I and II supergiant oilfields are one of the largest oil-producing fields, southern Iraq. They are parts of a supergiant anticline that extends more than 120 km. This anticline is oriented north-northwest and it's included the South Rumaila, North Rumaila, West Qurna I, and West Qurna II. The aim of this study is to integrate all available data to provide a better understanding of the subsurface structure for both West Qurna I and II. 3-D high-quality seismic data (in SEGY format) that executed for both oilfields independently were used as a key tool to supply perfect structural images. In addition to Zero-Offset Vertical Seismic Profile, set of well logs and well tops from 569 wells that distributed over the study area, 423 wells are located in West Qurna I, 146 wells situated in West Qurna II. OpenWorks, DecisionSpace G1 10ep and Seismic Analysis 10ep software of Halliburton were used to perform the 3D seismic interpretation and create structure maps (in-depth domain). While the cross-sections were done by Schlumberger software (Petrel 2018). Finally, the well tops were picked using Geolog 8.0. The study concludes that the structure of West Qurna I and II can be classified as an antiform, non-cylindrical, horizontal, gentle, brachy, asymmetrical anticline.
Highlights
The supergiant West Qurna I (WQI) and West Qurna II (WQII) oilfields are located in Mesopotamia hydrocarbon province (Abdullah et al, 2018)
This study focuses on the Khasib Formation that was divided into the upper Khasib member and the lower Khasib member (Mohammed, 2018) and the main objective is to provide highly precise structure maps of the three reflectors in order to provide an accurate horizontal and vertical extension of WQI and WQII structure using all available and reliable data (well logs, well tops, 3D seismic surveys, check shot, and Vertical Seismic Profile (VSP))
Numerous geometrical fold classifications of the Khasib Formation in both WQI and WQII oil fields have been done using highly precise structure maps of the three reflectors using the high quality of the 3D seismic survey, precise time-depth relationship drives from seven VSPs and one check shot, in addition, to use well tops from well logs to make some necessary adjustments to the structure maps
Summary
The supergiant West Qurna I (WQI) and West Qurna II (WQII) oilfields are located in Mesopotamia hydrocarbon province (Abdullah et al, 2018). Within these oilfields, there are several hydrocarbonbearing zones have been identified in the Cretaceous period. The first 2D seismic survey in West Qurna I & II was done in 1972 and the first well was not drilled until 1973 and 12 exploration and appraisal wells were drilled starting from 1983 (Kunakbayeva and Gauder, 2019). High-quality 3D seismic surveys were executed in West
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