The estimation of rock petrophysical parameters is an essential matter to characterize any reserv... more The estimation of rock petrophysical parameters is an essential matter to characterize any reservoir. This research deals with the evaluation of effective porosity (Pe), shale volume (Vsh) and water saturation (Sw) of reservoirs at Kumait and Dujalia fields, which were analyzed from well log and seismic data. The absolute acoustic impedance (AI) and relative acoustic impedance (RAI) were derived from a model which is based on the inversion of seismic 3-D post-stack data. NahrUmr formation’s sand reservoirs are identified by the RAI section of the study area. Nahr Umr sand-2 unit in Kumait field is the main reservoir; its delineation depends on the available well logs and AI sections information. The results of well logging interpretation showed a decrease of Sw and Vsh and an increase of effective porosity in the oil reservoir area, which coincides with the decrease of AI values. The existence of the water reservoir in Du-2 well revealed a convergence of the results of AI and effec...
The detailed data of the Vp/Vs ratio and porosity logs were used to detect the Oil-Water Contact ... more The detailed data of the Vp/Vs ratio and porosity logs were used to detect the Oil-Water Contact Zone (OWCZ) of Nahr Umr sandstone and Mishrif limestone reservoir formations in Kumiat (Kt) and Dujaila (Du) oil fields, southeastern Iraq. The results of OWC were confirmed using P-wave, Resistivity, and Water Saturation (Sw) logs of Kt-1 and Du-1 wells. It was found that the values of the oil-water contact zone thickness in Nahr Umr sandstone and Mishrif limestone were approximately one meter and eight meters, respectively. These results suggest that the OWCZ is possibly thicker in the carbonate rock than clastic rock formations. The thickness of OWCZ in the clastic rocks changed from one part to another, depending on several factors including mineral composition, grain size, porosity, pore shape, and fluid type.
Four hundred and seventy eight gravity base stations in Iraq were used to obtain a new local theo... more Four hundred and seventy eight gravity base stations in Iraq were used to obtain a new local theoretical gravity equation. The obtained equation was used to construct a Bouguer anomaly map of Iraq depending on the available gravity base stations. This map was compared with the Bouguer map constructed for the same stations using the international formula (1930). Good similarity in shapes and locations of the anomaly were observed, while the gravity anomaly values in the new map were increased by about 30 mGal. The eastern zero gravity contour line of the new obtained gravity map coincides with the western boundary of the tectonic Mesopotamian zone, while the main negative gravity values coincide with the Mesopotamian area, which contains most oil fields in eastern Iraq. All negative gravity anomaly areas coincide with the deepest basement rocks (the sedimentary basins) in Iraq. The obtained results are very valuable in geological applications.
A geoelectrical investigation is carried out for a geological consideration in the Shewasoor dam ... more A geoelectrical investigation is carried out for a geological consideration in the Shewasoor dam site, which is situated 40 km northeast Kirkuk city. Symmetrical Schlumberger array were applied for fifteen electrical sounding (VES) points, with a maximum spread distance (120-200) meters. Seven vertical electric sounding (VES) points were surveyed in the main valley. Two (VES) points were taken at the area behind the dam, and two other points at the right side of the dam body. Additional four (VES) points measured at the left side within the spillway area. In order to achieve the qualitative and quantitative interpretations manual partial matching technique and (IPI2 WIN) (ID) software are used. The results show that the surface is comprise of recent silt, clay, sand and gravel sediments with trace of water. The subsurface within the valley nearby the dam body is dominanted by claystone underlined by pebbly sandstone with water table condition, while the spillway is characterize by silt and gravel sediments. The area behind the dam body subsurface is composed of silty sandstone underlined by sandy siltstone. It is concluded that the subsurface layers of the dam site are suffering from heterogeneity.
Seismic refraction survey is conducted for geotechnical evaluation to the soil of Tikrit universi... more Seismic refraction survey is conducted for geotechnical evaluation to the soil of Tikrit university at allocated site to construct a new building for housing the professors of the university. The measurements of compressionnal and shear waves velocities are conducted along six profiles at the study area. Four main layers were recognized from the results of the seismic data interpretation. Depending on the (Vs/Vp) ratio, three geotechnical properties were calculated for geotechnical evaluation to the different layers, these are Poisson's ratio(σ), Material index (Im) ,Plasticity index (P.i). The contour maps for different layers are plotted to show the distribution of geotechnical properties at the study area. These maps are divided into two zones, Zone A represents the area which has good geotechnical properties ,and Zone B represents the area which has weak geotechnical properties such as loose unconsolidated sediments or weak zones. The results of evaluation show that the first and third layers are fairly competent to intermediate competent layers because they have good geotechnical properties by comparing with second and fourth layers which have poor geotechnical properties which represent incompetent layers. Depending on the values of plasticity index , the sediments of the study area ranges between low plasticity to intermediate plasticity sediments except some of the places characterized by high values of plasticity index representing high plasticity sediments. .
The present study aims to investigate the possible causes of cracks, in the walls of buildings an... more The present study aims to investigate the possible causes of cracks, in the walls of buildings and storage tanks, in Al-Hussian water project of Kerbalaa city. Eight seismic refraction profiles and seven cross-hole sections were made to investigate the pumping station hall in the studied site.
A new method, depends on the determination of the horizontal and vertical gradients of gravity da... more A new method, depends on the determination of the horizontal and vertical gradients of gravity data, is introduced for estimating the depth of gravity source. The distance of the nearest intersection point, of horizontal and vertical gradient, to the central axis of the gravity anomaly (x) is found to be related directly to depth of gravity source. Two relations were obtained to estimate the depth of the source that is approximated to spherical or horizontal cylinder bodies. The suggested method is applied on four groups of gravity data, where the depths to the sources are well known, and the results are generally confirming the actual depth. The introduced method is applied for two gravity anomalies in Iraq of which the depth is unknown and acceptable results are obtained.
The estimation of rock petrophysical parameters is an essential matter to characterize any reserv... more The estimation of rock petrophysical parameters is an essential matter to characterize any reservoir. This research deals with the evaluation of effective porosity (Pe), shale volume (Vsh) and water saturation (Sw) of reservoirs at Kumait and Dujalia fields, which were analyzed from well log and seismic data. The absolute acoustic impedance (AI) and relative acoustic impedance (RAI) were derived from a model which is based on the inversion of seismic 3-D post-stack data. NahrUmr formation’s sand reservoirs are identified by the RAI section of the study area. Nahr Umr sand-2 unit in Kumait field is the main reservoir; its delineation depends on the available well logs and AI sections information. The results of well logging interpretation showed a decrease of Sw and Vsh and an increase of effective porosity in the oil reservoir area, which coincides with the decrease of AI values. The existence of the water reservoir in Du-2 well revealed a convergence of the results of AI and effec...
The detailed data of the Vp/Vs ratio and porosity logs were used to detect the Oil-Water Contact ... more The detailed data of the Vp/Vs ratio and porosity logs were used to detect the Oil-Water Contact Zone (OWCZ) of Nahr Umr sandstone and Mishrif limestone reservoir formations in Kumiat (Kt) and Dujaila (Du) oil fields, southeastern Iraq. The results of OWC were confirmed using P-wave, Resistivity, and Water Saturation (Sw) logs of Kt-1 and Du-1 wells. It was found that the values of the oil-water contact zone thickness in Nahr Umr sandstone and Mishrif limestone were approximately one meter and eight meters, respectively. These results suggest that the OWCZ is possibly thicker in the carbonate rock than clastic rock formations. The thickness of OWCZ in the clastic rocks changed from one part to another, depending on several factors including mineral composition, grain size, porosity, pore shape, and fluid type.
Four hundred and seventy eight gravity base stations in Iraq were used to obtain a new local theo... more Four hundred and seventy eight gravity base stations in Iraq were used to obtain a new local theoretical gravity equation. The obtained equation was used to construct a Bouguer anomaly map of Iraq depending on the available gravity base stations. This map was compared with the Bouguer map constructed for the same stations using the international formula (1930). Good similarity in shapes and locations of the anomaly were observed, while the gravity anomaly values in the new map were increased by about 30 mGal. The eastern zero gravity contour line of the new obtained gravity map coincides with the western boundary of the tectonic Mesopotamian zone, while the main negative gravity values coincide with the Mesopotamian area, which contains most oil fields in eastern Iraq. All negative gravity anomaly areas coincide with the deepest basement rocks (the sedimentary basins) in Iraq. The obtained results are very valuable in geological applications.
A geoelectrical investigation is carried out for a geological consideration in the Shewasoor dam ... more A geoelectrical investigation is carried out for a geological consideration in the Shewasoor dam site, which is situated 40 km northeast Kirkuk city. Symmetrical Schlumberger array were applied for fifteen electrical sounding (VES) points, with a maximum spread distance (120-200) meters. Seven vertical electric sounding (VES) points were surveyed in the main valley. Two (VES) points were taken at the area behind the dam, and two other points at the right side of the dam body. Additional four (VES) points measured at the left side within the spillway area. In order to achieve the qualitative and quantitative interpretations manual partial matching technique and (IPI2 WIN) (ID) software are used. The results show that the surface is comprise of recent silt, clay, sand and gravel sediments with trace of water. The subsurface within the valley nearby the dam body is dominanted by claystone underlined by pebbly sandstone with water table condition, while the spillway is characterize by silt and gravel sediments. The area behind the dam body subsurface is composed of silty sandstone underlined by sandy siltstone. It is concluded that the subsurface layers of the dam site are suffering from heterogeneity.
Seismic refraction survey is conducted for geotechnical evaluation to the soil of Tikrit universi... more Seismic refraction survey is conducted for geotechnical evaluation to the soil of Tikrit university at allocated site to construct a new building for housing the professors of the university. The measurements of compressionnal and shear waves velocities are conducted along six profiles at the study area. Four main layers were recognized from the results of the seismic data interpretation. Depending on the (Vs/Vp) ratio, three geotechnical properties were calculated for geotechnical evaluation to the different layers, these are Poisson's ratio(σ), Material index (Im) ,Plasticity index (P.i). The contour maps for different layers are plotted to show the distribution of geotechnical properties at the study area. These maps are divided into two zones, Zone A represents the area which has good geotechnical properties ,and Zone B represents the area which has weak geotechnical properties such as loose unconsolidated sediments or weak zones. The results of evaluation show that the first and third layers are fairly competent to intermediate competent layers because they have good geotechnical properties by comparing with second and fourth layers which have poor geotechnical properties which represent incompetent layers. Depending on the values of plasticity index , the sediments of the study area ranges between low plasticity to intermediate plasticity sediments except some of the places characterized by high values of plasticity index representing high plasticity sediments. .
The present study aims to investigate the possible causes of cracks, in the walls of buildings an... more The present study aims to investigate the possible causes of cracks, in the walls of buildings and storage tanks, in Al-Hussian water project of Kerbalaa city. Eight seismic refraction profiles and seven cross-hole sections were made to investigate the pumping station hall in the studied site.
A new method, depends on the determination of the horizontal and vertical gradients of gravity da... more A new method, depends on the determination of the horizontal and vertical gradients of gravity data, is introduced for estimating the depth of gravity source. The distance of the nearest intersection point, of horizontal and vertical gradient, to the central axis of the gravity anomaly (x) is found to be related directly to depth of gravity source. Two relations were obtained to estimate the depth of the source that is approximated to spherical or horizontal cylinder bodies. The suggested method is applied on four groups of gravity data, where the depths to the sources are well known, and the results are generally confirming the actual depth. The introduced method is applied for two gravity anomalies in Iraq of which the depth is unknown and acceptable results are obtained.
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Papers by Ahmed Al-Banna