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
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.
2022-08
Journal of University of Duhok
(Issue : 2)
(Volume : 15)
GRAVIMETRIC SIGNATURE OF THE TECTONOSTRATIGRAPHIY OF THE MOSUL BLOCK OIL FIELDS USING MAP ENHANCEMENT TECHNIQUES
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
2012-06
Thesis
2023-11-02
PH.D: Dissertation "Using 3D seismic attributes analysis to estimate structure and properties of the reservoir in Chia Surkh field – Kalar, Kurdistan Region, Iraq"
PHD
2023
2010-08-11
M.Sc. thesis : Simulation of Gravity Data in Western Nainawa Area
Abstract:
The study area lies in the northern part of Iraq in the western part of
Nainawa governorate. It is surrounded by Tigris River to the east,
Mashuradagh anticline to the north, Sinjar anticline and Baaj area to the west
and Al- Gayara region to the south, The study area locates within the foothill
subzone including Mosul block consisting of secondary blocks which was
suggested by a stratigraphic correlation based on deep oil exploration wells.
The Bouguer gravity map covered the study area reflects a gravity high
which its centre locates near Atshan anticlinal structure. The previous gravity
high extends over many anticlinal structured surfaces Allan, Shaikh -Ibrahim,
Sasan, Ishkaft, Gusair, Ain-Zalah, Butma, Rafan, Atshan, Nwaigit, Qlaian,
Adayia and Najma. Twenty-three gravity traverses were chosen. (T1-T8) with
NW-SE direction and the others (T10-T24) with NE-SW.
The present study conducted simulation of gravity data with different
computer techniques taken in to consideration the previous studies. The
calibrated gravity field was chosen visually and upward continually avoiding
both the personal bias and the pure mathematic. Mosul block reflects a huge
mass of 120 Km length and 60 Km width which is divided into a southern
block with Zagrosian trend and a northern Taurosian trend by a strike-slip
fault might explaining why the anticlines changing their axes orientations
from NW-SE to the southern one with E-W on the northern.
The gavity anomally of Mosul block reflects density vaiation between
basement rocks and the sedimentary cover.
On the other hand, the study explained subsidiary block faults
surrounding and within Mosul block which extends in role to deep depths.
This conclusions leads to the large importance of the study area due to
presence of hydrocarbon resources in sedimentary basins as a result of
tectonic activities during the geological eras.
2010
Presentation
Dept. of Env. Science
2022-10
Student project Outline
Outlining the requirements of the student graduation project
2022
Dept. of Env. Science
2022-05
Interpretation of Geologic Features
Explain and interpret the reasons for geologic events on the earth like earthquakes, Volcanoes Mountains creations,,,,,
