2022-10

Science Journal of University of Zakho (Issue : 4) (Volume : 10)

This study includes picking seven reflectors from intense sampling of 3D Seismic survey composed of 40 inlines and 30 crosslines, the distance between the seismic lines is equal to 250m. The study deals with extracting and analysing volume seismic attributes of 3D seismic data of Chia Surkh area. The area is located east of Kalar City, Sulaimani Government, Kurdistan Region, Iraq. The main aim is to determine locations of hydrocarbon accumulation by picking seven horizons as well as studying and analysing both subsurface structure and direct hydrocarbon indicators. The seismic volume attributes are calculated from the original seismic data that consist of (400) inlines and (300) crosslines, and the distance between two adjacent lines is equal to (25m). The seismic attributes used in the current study are, variance edge, curvature, root mean square, envelope and sweetness. Revealed existence of a major anticline, a major fault. As well as two small faults were detected and running parallel to the major fault, while the envelope and sweetness attributes emphasized appearance of several bright spots within Lower Fars, Dhiban, Jeribe and Euphrates Formations, which give quite evidence for accumulation of hydrocarbon. The study concluded that the complete system requires for existence of petroleum is available such as the major anticlinal structure, carbonate rocks as an excellent reservoir rocks and gypsum or (anhydrite) as an optimal cap rock. The existence of hydrocarbon is confirmed by bright spots

2022-08

Iraqi geological journal (Issue : 2) (Volume : 55)

The current study aims to detect subsurface geologic features using 3D dense sampling seismic data in the Fatha Formation, in the Chia Surkh area, Kurdistan Region, Iraq. A3D cube seismic data covering 75 Km2 were used to image the Fatha Formation subsurface geologic structures. The seismic data and appropriate information were gathered from Pet Oil Company with the permission of the Ministry of Natural Resources of the Kurdistan Region, Iraq. A cube of seismic data was used to image the three units of the Fatha Formation. In this study,  forty seismic sections with the direction of NE-SW and 30 crossline sections of NW-SE direction were used. The map shows the existence of several features such as a three-way dip closure elongated NW-SE and extended through the whole study area. The reflector three of the Fatha isochron map shows TWT ranging from 890 ms to 1720 ms. The depth map of Fatha unit 1 Formation, shows depth with seismic reference datum ranging from 838 m to 2334 m. The study concluded the existence of several structural features; a major anticline trending with the Zagros belt trend, and three longitudinal systematic reverse faults on the southwest side of the anticline, leading to the possibility for the area is considered a prospective oil reservoir, might work as a good trap, an anticline, evaporites work as a seal and limestone rocks as a reservoir.

2012-06

Journal of University of Duhok (Issue : 2) (Volume : 15)

The study area is located in the northern part of Iraq to the west of Mosul city within the foothill subzone which including secondary blocks suggested by previous tectonostratigraphic studies. The area under consideration is covered with a gravity high where its centre locates near Atshan anticline and extends over many anticlinal structured surfaces( Allan, Shaikh -Ibrahiem, Sasan , Ishkaft, Gusair, Ain-Zala, Butma, Rafan, Atshan, Nwaigit, Qlaian, Adaya and Najma). The enhanced gravity maps of the Geokriging, Modified Shepard's, Triangulation, Convolution Filter-11, Local Polynomials and subtracting the Polynomial Regression from the modified Shepard's have displayed the characteristics of a huge Mosul block which divided into a southern block (Zagros trend) and a northern block (Taurus trend) by a strike-slip fault(SF) explaining the reason of the change of anticline axes orientations. On the other hand, the enhanced gravity map of Convolution Filter-41 removed the gravity signature caused by all Mosul's secondary blocks while the map of subtracting of the Local Polynomial from modified Shepard's, and the First Directional Derivative map have identified twelve secondary blocks which have got a valuable importance of the hydrocarbon resources in sedimentary basins as a result of tectonic activities during the geological eras. KEYWORDS. Gravity signature, Mosul