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AAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain

Magnetically Inferred Basement Structures in the Central Part of the Kuwait Arch

Parmjit Singh1; Riyasat Husain1; Abdul Aziz H. Sajer1

(1) Exploration, Kuwait Oil Company, Ahmadi, Kuwait.

Previous HitMagneticNext Hit data over the Kuwait Arch concealed by overlying Phanerozoic strata, shows a broad circular Previous HitmagneticNext Hit high over the Kuwait Bay area and a conspicuous E-W trending associated Previous HitmagneticNext Hit low on the north over the Bahrah area of nearly comparable amplitude. The gravity and seismic data shows a major high over the same area which is as per the tectonic events in the area. The present study is focused on the conspicuous Previous HitmagneticNext Hit low over the crestal part of the dominantly N-S trending Kuwait Arch where a comparatively complex Bahrah oil field is located. On the basis of Previous HitmagneticNext Hit signatures, it appears that shield elements (basic metavolcanics like basalt and rhyolite with high Previous HitmagneticNext Hit susceptibility) extend beneath Phanerozoic cover resulting in a dipole signature of Previous HitmagneticNext Hit anomaly. In order to infer the basement structures lying beneath the Bahrah and Kuwait Bay areas, Previous HitmagneticNext Hit anomaly data has been processed, filtered and integrated with the gravity and seismic data.

To locate the observed Previous HitmagneticNext Hit anomalies directly over the Previous HitmagneticNext Hit source bodies that caused these anomalies, the Total Previous HitMagneticNext Hit Intensity (TMI) data has been transformed into Reduced-To-Pole (RTP) map. The TMI data also processed for 3D Analytic Signal, produces maxima over Previous HitmagneticNext Hit contacts regardless of the direction of magnetization. The enhancement of Previous HitmagneticNext Hit anomalies associated with faults and other structural discontinuities was achieved by the application of bandpass filter (4-12km) to the TMI-RTP data which defined the best continuity and resolution of the linear features.

Basement structures, faults and shear zones can easily be traced along linear features which prove the effectiveness in the interpretation. Faults and shear zones coincide with zones of significant changes in Previous HitmagneticNext Hit and structural characteristics. The NNE-SSW orientation of basement-involved structures over Bahrah and Kuwait Bay area are easily identified on bandpass filtered TMI-RTP data. The Bahrah oil & gas wells producing from Cretaceous/Jurassic levels are located on magnetically inferred basement highs. Basement structural highs control the structural development of the sedimentary cover. The Previous HitmagneticTop data after integration with gravity, seismic, borehole and geologic data reveals the elements of basement structures over which the Bahrah oil field is located. This study can assist in effective placement of future wells in Kuwait Bay and Bahrah area.