Data Acquisition and Processing of Hartha Formation in the east Baghdad oil field, Central of Iraq

A three-dimensional survey was carried out to Eastern Baghdad oil field, which consist three parts, the area of (EB South- 2 ) approximately 179,875 km2 and ( EB South-1) is about (602.03) km2, while the space segment (EB South-3) is approximately to (419.095) km2. In this research, was focused on Hartha Formation only. Based on many tests to designation of pre-planning of the survey to get good signal to noise ratio for receivers in addition to the best suit for vibrators distribution and also getting the best signal source where spread of a 60-line impact and the distance between the point of receive and the other are (2 meters), also using (5) vibrators Type (NOMAD 65) with a maximum capacity of (62000 LB) for each shock. Where all processes work such as enhancing signal at the expense of noise, correction CDP gather for Normal Move Out (NMO) and stack them, correction for influence of near-surface time delays (static correction), filtering processes, providing velocity information, increasing resolution and collapsing diffractions and placing dipping events in their correct subsurface locations (migration) This processes are achieved using computers, they include many mathematical processes depend on physical fundamentals. The main processes in seismic data processing include : stacking, deconvolution, and migration. By using the information of EB-1 Well, and making the relationship time-depth curve of EB-1 then following up on getting synthetic to be linked later with seismic data and sections to obtain a real subsurface image

Seismic stratigraphy study of the East Razzaza in Jurassic- Cretaceous succession- Central Iraq

This study is deal with seismic structural and stratigraphic interpretation that applied on the East Razzaza (central of Iraq) area, by using 2D seismic data from Oil Exploration Company. Three main seismic reflectors were picked. These reflectors are Zubair, Yamama and Gotnia Formations, which were used to define petrophysical well logs and synthetic seismograms , that are calculated from sonic-logs of the wells of East Baghdad-1 (Eb-1) and West Kifl-1(Wk-1) by Geoframe program, to interpret the Yamama basin and the boundaries of the basin (Zubair and Gotnia Formations), and suggest a stratigraphic model for the study area. Structural maps are prepared for each reflector in addition to analyze stratigraphic features on the seismic sections to obtain the location and direction of the sedimentary basin and shoreline. It is concluded that the basin lies in the east and south east of the area. Seismic stratigraphic interpretation of the area approves the presence of some stratigraphic features in the studied formations. Some distributary buildup mound and carbonate platform are determined. Yamama Formation is interpreted to represent a carbonate platform, and it is divided into three sequences; they represent progradational seismic facies (sigmoid). Maximum flooding surface (MFS) is recognized on top of Yamama Formation and system tracts are determined on the basis of seismic and log data. Seismic attributes technique was used to predict the physical properties distribution of Yamama Formation succession

3D Reservoir Study for Yamama Formation in Nasirya Oil field in Southern of Iraq

Nasriya oil field is located at the Southern part of Iraq, this field is a giant and prolific, so it take a special are from the Oil Exploration Company for development purposes by using 3D seismic reflection. The primary objective of this thesis is to obtain reservoir properties and enhance the method of getting precise information about subsurface reservoir characterizations by improving the estimation of petrophysical properties (effective porosity, P-wave, water saturation and poisson's ratio). There are five wells in the study area penetrated the required reservoirs within Yammam Formation. The Synthetic seismogram of Nasriya wells were created to conduct well tie with seismic data. These well tie was very good matching with seismic section using best average statistical wavelet. Five main horizons were picked from the reflectors by using synthetic seismogram for wells then converted to structural maps in depth domain by using average velocity of five wells. By using petrel program TWT maps have been constructed from the picked horizons, Average velocity maps calculated from the wells velocities survey data and the sonic log information and Depth maps construction was drawn using Direct time-depth conversion and the general trend of these map was NW-SE. The model of low frequency was created from the low frequency contents from well data and the five main horizons were picked. The seismic inversion technique was performed on post-stack three dimensions (3D) seismic data in Nasriya oil field

Desinging of 3D Seismic Survey And Data Processing of Abu Amood Oil Field Southern of Iraq

3D seismic reflection study was applied to Abu Amood oil field which is located to the southern part of Iraq within Dhi Qar province that carried out by oil Exploration Company to an area 1534.88 Km2 for studying Nahr Umr Formation. Field tests was the first stage in exploration to determination the best standard to get the better records of signal to noise ratio which is given for instruments to act on it to get better results: In the field of Abu Amood there are three main of field tests (noise test, signal test and geometry distribution pattern of vibrators). According to field tests the seismic selected the standard field to accomplish of the survey program. The pre-planning of the survey, the second step in oil exploration crew used specific design that ensures of execution with high quality of seismic recorded data. The processing of seismic data were carried out using Omega ve 2.7 included processing the following steps:- (Reformating, Geometry defines, Gain (Spherical Diversions), Static Correction (Elevation Static), AMPSCAL (Noise Suppression by Amplitude Scaling) or (Random Noise Attenuation), TMDDF(Trimmed Mean Dynamic Dip Filter), SCAC (Surface Consistent Amplitude Compensation), Surface-Consistent Deconvolution, CMP Sort, Stack Velocity Analysis ( First Pass) , Residual Static Correction Calculation and Application, Normal Move Out Correction / Mute / Stack, Post Stack Time Migration)