scholarly journals Karst feature in Mishrif Reservoir and effect on drilling and production in Zubair oil field, Southern Iraq

2020 ◽  
Vol 10 (4) ◽  
pp. 19-32
Author(s):  
Hussein Saeed Almalikee ◽  
Hayder Kadhim Almayyahi ◽  
Methaq Khazal Al-Jafar
Keyword(s):  
Seismic Data ◽  
Economic Effect ◽  
Carbonate Reservoir ◽  
Oil Field ◽  
Static Data ◽  
Karst Feature ◽  
Negative Effect ◽  
Reservoir Connectivity ◽  
Southern Iraq

Karst features in the upper part of Mishrif carbonate reservoir can commonly create substantial vugs, pores and fissures and, thus, increasing the porosity and enhancing reservoir connectivity and permeability, this features were formed normally as a result of the carbonate rocks dissolution under the action of meteoric waters during very long periods of emersion spanning from Late Cenomanian to Turonian (about 4.5 Million years). This study deals with the presence of the karst features in Zubair oil field, southern Iraq, where Karst features were observed in the center and northern parts of the field close to the top of Mishrif Formation in most of the cored wells. Characterization of that feature can be achieved from static data at wellbore scale from core, and logs (conventional and non-conventional), and dynamic data such as mud losses, well tests combined with production logs (PLT) in addition to Seismic data. Beside the positive and economic effect of Karst, there is negative effect which includes causing mud losses during drilling in Mishrif Formation because of low reservoir pore pressure, Therefore, acid soluble cement plugs were used to heal that losses to continue drilling.

scholarly journals Structural Interpretation of Yamama and Naokelekan Formations in Tuba Oil Field Using 2D Seismic Data

2021 ◽  
Vol 54 (2B) ◽  
pp. 55-64
Author(s):  
Belal M. Odeh
Keyword(s):  
Seismic Data ◽  
Seismic Reflection ◽  
Synthetic Seismogram ◽  
Oil Field ◽  
Well Log ◽  
Seismic Reflection Data ◽  
Depth Maps ◽  
Reflection Data ◽  
Interpretation Process ◽  
Southern Iraq

This research includes structure interpretation of the Yamama Formation (Lower Cretaceous) and the Naokelekan Formation (Jurassic) using 2D seismic reflection data of the Tuba oil field region, Basrah, southern Iraq. The two reflectors (Yamama and Naokelekan) were defined and picked as peak and tough depending on the 2D seismic reflection interpretation process, based on the synthetic seismogram and well log data. In order to obtain structural settings, these horizons were followed over all the regions. Two-way travel-time maps, depth maps, and velocity maps have been produced for top Yamama and top Naokelekan formations. The study concluded that certain longitudinal enclosures reflect anticlines in the east and west of the study area representing Zubair and Rumaila fold confined between them a fold consist of two domes represents Tuba fold with the same trending of Zubair and Rumaila structures. The study confirmed the importance of this field as a reservoir of the accumulation of hydrocarbons.

Characterization of fluid-flow anisotropy in a carbonate reservoir using AVAZ inversion of wide-azimuth seismic data

2017 ◽  
Author(s):  
Lennert den Boer ◽  
Colin Sayers ◽  
Edan Gofer ◽  
Maria Lascano ◽  
Milton Walz ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Seismic Data ◽  
Carbonate Reservoir ◽  
Flow Anisotropy

Seismic Stratigraphy and Seismic Geomorphology: Insights on Characterization of a Carbonate Reservoir

2011 ◽  
Vol 138-139 ◽  
pp. 447-452 ◽  
Author(s):  
Ru Tai Duan ◽  
Zhen Kui Jin ◽  
Chong Hui Suo
Keyword(s):  
Seismic Data ◽  
Seismic Stratigraphy ◽  
Depositional Environments ◽  
Carbonate Reservoir ◽  
Oil Field ◽  
3D Seismic ◽  
Element Analysis ◽  
Hydrocarbon Production ◽  
Seismic Geomorphology ◽  
3D Seismic Data

Seismic stratigraphy and seismic geomorphology provides an indication of a carbonate platform’s internal and external architecture. High quality 3D seismic data integrated with wireline logs and core materials furthers detailed depositional element analysis, lithology prediction and diagenetic modification of the stratigraphic section, which help to build a depositional model, sequence stratigraphy framework and enhance the evaluation of the reservoir potential of this unit and a prediction of fluid flow during hydrocarbon production. This study mainly focus on using 3D seismic data calibrated with core and logs from oil field A to characterize the stratigraphy and geomorphology of the depositional elements of the carbonate reservoir (Aptaian Stage) and infer the process of the deposition where appropriate. Integration of seismic data with well data provides the frame work for reconstruction depositional evolution history the reservoir. The high seismic resolution of the A reservoirs also provides useful analogs for other subsurface reservoirs from similar depositional environments.

scholarly journals Seismic characterization of fractured reservoirs by focusing Gaussian beams

Geophysics ◽  
2013 ◽  
Vol 78 (4) ◽  
pp. A23-A28 ◽  
Author(s):  
Yingcai Zheng ◽  
Xinding Fang ◽  
Michael C. Fehler ◽  
Daniel R. Burns
Keyword(s):  
Seismic Data ◽  
Fractured Reservoirs ◽  
Oil Production ◽  
Oil Field ◽  
Critical Parameters ◽  
Gaussian Beams ◽  
Fractured Reservoir ◽  
Fracture Orientation ◽  
Double Beam

Naturally fractured reservoirs occur worldwide, and they account for the bulk of global oil production. The most important impact of fractures is their influence on fluid flow. To maximize oil production, the characterization of a fractured reservoir at the scale of an oil field is very important. For fluid transport, the critical parameters are connectivity and transmittivity plus orientation. These can be related to fracture spacing, compliance, and orientation, which are the critical seismic parameters of rock physics models. We discovered a new seismic technique that can invert for the spatially dependent fracture orientation, spacing, and compliance, using surface seismic data. Unlike most seismic methods that rely on using singly scattered/diffracted waves whose signal-to-noise ratios are usually very low, we found that waves multiply scattered by fractures can be energetic. The direction information of the fracture multiply scattered waves contains fracture orientation and spacing information, and the amplitude of these waves gives the compliance. Our algorithm made use of the interference of two true-amplitude Gaussian beams emitted from surface source and receiver arrays that are extrapolated downward and focused on fractured reservoir targets. The double beam interference pattern provides information about the three fracture parameters. We performed a blind test on our methodology. A 3D model with two sets of orthogonal fractures was built, and a 3D staggered finite-difference method using the Schoenberg linear-slip boundary condition for fractures was used to generate the synthetic surface seismic data set. The test results showed that we were able to not only invert for the fracture orientation and spacing, but also the compliance field.

scholarly journals The Seismic Interpretation for (X) Oil Field Depending on 3D Seismic Data of Nearby Oil Field, Southern Iraq

2021 ◽  
Vol 11 (4) ◽  
pp. 36-50
Author(s):  
Wessam Abdul Abbas Alhammod ◽  
Ban Talib Aljizani
Keyword(s):  
Seismic Data ◽  
Velocity Model ◽  
Oil Field ◽  
Seismic Survey ◽  
Rock Properties ◽  
3D Seismic ◽  
Water Contact ◽  
The Time Domain ◽  
Structural Closure ◽  
Southern Iraq

This research focused on using seismic data to review the structure of the (X) Oil Field, located 40 km SW of Basrah, Southern Iraq. The study utilises a 3D seismic survey conducted during 2011-2012, covering the (Y) Oil Field 2 km to the west, and with partial coverage across (X), to map the Top Zubair reflector. Seismic rock properties analysis was conducted on key (X) Oil Field wells and used to tie the Top Zubair reflector on (X) Oil Field. The reflector was mapped within the time domain using DecisionSpace Software, and then converted to depth using a velocity model. The depth structure map was then compared to the original oil water contact (OOWC) across the fields to understand the potential structural closure of the Top Zubair reservoir in both fields.

Characterization of Seismic Noise in an Oil Field Using Passive Seismic Data from a Hydraulic Fracturing Operation

2021 ◽  
Author(s):  
David Wendell Tomaz da Silva ◽  
Aderson Farias do Nascimento ◽  
Flavio Lemos de Santana
Keyword(s):  
Hydraulic Fracturing ◽  
Seismic Data ◽  
Seismic Noise ◽  
Oil Field ◽  
Passive Seismic

A Case Study of Complex Carbonate Reservoir Connectivity Analysis, Tarim Basin, China

2021 ◽  
pp. 1-41
Author(s):  
Zhangwu Meng ◽  
Zandong Sun ◽  
Guofa Li
Keyword(s):  
Tarim Basin ◽  
Seismic Data ◽  
Seismic Reflection ◽  
Carbonate Reservoir ◽  
Carbonate Reservoirs ◽  
Connectivity Analysis ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Diffraction Imaging ◽  
Reservoir Connectivity

The connectivity of complex carbonate reservoirs has an essential impact on the exploration and development of these reservoirs. From geological genesis, the connectivity of complex carbonate reservoirs is mainly controlled by faults and dissolution. Therefore, accurate identification of faults and karst caves is the key to studying reservoir connectivity. The Ordovician carbonate reservoir in the Hudson Oilfield of the Tarim Basin is used for the reservoir connectivity analysis study. Firstly, we calculate the coherence and curvature attributes and then merge the two attributes using a neural network algorithm. Finally, we use the ant tracking method to track the faults for the merged data. The results show that the approach substantially enhances deterministic faults that can be seen directly on the seismic data, and the subtle faults can also be identified. For reservoir identification, we use the diffraction imaging method to describe the karst reservoir in this study area. The results show that diffraction imaging can identify small-scale caves that cannot be well recognized on the seismic reflection data. Furthermore, the caves connected on the diffraction seismic data are isolated from each other on the seismic reflection data, making the connection between caves clearer. Based on the results of faults and caves identification, we analyze the reservoir connectivity of the study area using the oil pressure and daily production data. It indicates that the NNW and near-NS faults probably play a role in the connection of the reservoirs, while the NEE faults tend to block the connection of the reservoirs.

scholarly journals 2D Seismic Reflection Study of Mishrif and Yamama Formations in East Nasiriya Area, Southern Iraq

2021 ◽  
pp. 2603-2613
Author(s):  
Mohammed S. Faisal ◽  
Kamal K. Ali
Keyword(s):  
Seismic Data ◽  
Oil And Gas ◽  
Seismic Profile ◽  
Oil Field ◽  
Contour Map ◽  
Oil And Gas Exploration ◽  
Subsurface Geology ◽  
Depth Maps ◽  
Cretaceous Period ◽  
Southern Iraq

The structural division and stratigraphic estimation of the perceptible geological basin are the most important for oil and gas exploration. This study attempts to obtain subsurface geology in parts of east Nasiriya, southern Iraq using of seismic data and some adjacent well information for structural and stratigraphic interpretation. To achieve this goal, 2D seismic data in SEG-Y format were used with velocity and logging data. The seismic profile is then interpreted as a two-dimensional (time domain and depth domain) contour map, which is  represented  as a real subsurface geology. Reflectors from the Mishrif and Yamama Formations (Cretaceous period) were detected. According to the structural interpretation of the selected reflectors, TWT maps of the horizon were prepared, and  depth maps were drawn, which show some noses structures in the study area. The seismic interpretation in this area confirmed the existence of certain stratigraphic features in the studied strata. Some distribution mounds and flat spots were also observed which similar to the characteristics of the Nasiriya oil field stratigraphic features that are the considered as hydrocarbon indicators.

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