Asmari anticline shows the exclusive outcrop of the Asmari formation in the Dezful embayment. In ... more Asmari anticline shows the exclusive outcrop of the Asmari formation in the Dezful embayment. In order to estimate the strain parameters and shortening values, 26 geological cross sections were prepared perpendicular to the anticline axis. The interlimb angles of the northern and central parts of the anticline are lower than the southern parts. The strain ratio (R) is between 1.12-1.52. The strain ratio zoning map shows the higher strain values in the northern and central parts of the Asmari anticline. The length of folded layer of Asmari formation (L0) and the straight length (L1) were measured in the geological cross sections and amount of shortening were calculated in each section. Results indicate that the shortening in the different parts of the Asmari anticline is 1.8% to 12%. Shortening zonation map of the Asmari anticline shows higher shortening in the northern and central parts of the anticline than the southern parts.
This paper proposes a new method for 3D finite strain analysis. This method utilizes a Mohr circl... more This paper proposes a new method for 3D finite strain analysis. This method utilizes a Mohr circle construction combined with stereographic projection of the geometry of no finite longitudinal strain and with the strain ratio on the XZ-plane of the finite strain ellipsoid. The ...
Carbonate rocks form the central part of hydrocarbon reservoirs worldwide, about 60% (Lamarche et... more Carbonate rocks form the central part of hydrocarbon reservoirs worldwide, about 60% (Lamarche et al., 2012). Fractured reservoir contributes about 85% of hydrocarbon reservoirs. Thus, the main reason to study this type and fracture analysis is to understand the fracture behavior (Bourbiaux, 2010; Guerriero et al., 2011; Tarazona, 2017) due to their importance because of production and drilling process. Core samples, image logs, and sonic tools are the foremost valuable tools for fracture analysis in subsurface studies (Esmersoy, 1995). Of these sonic plots (e.g., compressive, shear, and Stonely waves), they have higher efficiency than other methods due to estimating the primary porosity of matrix and are sensitive to reservoir properties such as permeability (Han et al., 2018). There are available numerous research publications (
Finite strain and vorticity analyses were carried out in the deformed conglomerate and micro-cong... more Finite strain and vorticity analyses were carried out in the deformed conglomerate and micro-conglomerate of Goushti shear zone in the Sanandaj-Sirjan metamorphic belt (Zagros Mountains Iran). These deformed rocks are bounded between two NE and SW major thrust faults. Finite strain measurements on three principal planes of strain ellipsoid show the higher amounts of strain ratios near the major thrust faults. Strain ellipsoid shape (K-value) and strain intensity (D-value) of the Flinn diagram reveal more prolate shape of strain ellipsoid and more amount of strain intensity around the major thrust faults. According to the amounts of natural logarithmic strain (e), mylonite and protomylonite rocks have been formed in lower and higher distances from the main basal and dorsal faults respectively. Kinematic vorticity (Wm) analysis reveals an important strain partitioning in the Goushti shear zone. Results show simple shear dominant deformation near the major thrust faults and pure shear ...
Fractures within a reservoir play an influential role in the porosity and permeability, therefore... more Fractures within a reservoir play an influential role in the porosity and permeability, therefore affect the fluid flow. By analyzing properties of fractures, such as fracture height, density and mutually spacing and compare them with different tectonic locations and different lithologies, one could gain insight in the mechanical behavior of a rock mass, when distorted by tectonic forces. The velocity deviation log (VDL) can be used for determination of effective porosity. The result indicated that there is a high fractures density in the Asmari Formation which shows high correlation with VDL. They are mainly strike N75E, S75W direction and are chiefly observed in the upper Asmari zones. Fractures and vuggy have been also observed in the well. Image log showed a range of bedding dip from 53-89 degree with strike N55W, S55E in the well indicating of reverse limb in the field. Image log show tow set fracture which azimuth 347 for discontinuous fracture and 220 with strike N55W, S55E for continuous fracture. Main type of lithology determined by petrophysical log showed that dolomite is dominant constituent. Induced fractures and breakouts haven't seen observed in this well. After correlating image logs with VDL and lithology, zones with dominant pure dolomite presented higher aperture rather zones with dolomite and anhydrite. Fracture density is more affected by bed thickness to mineralogy. Zones with negative deviation velocity have high fracture density or high fracture aperture.
Determination of finite strain and vorticity analysis are important aims in the structural geolog... more Determination of finite strain and vorticity analysis are important aims in the structural geology to characterize the strain geometry and the partitioning of pure shear and simple shear components in the deformed area. Application of anticlines as strain markers can use to quantifying the strain parameters. In this study we suppose the earth surface as maximum principal finite strain ellipsoid
Egu General Assembly Conference Abstracts, May 1, 2010
Tang-e-Hana region is located in the Snandaj-Sirjan structural zone in the Northwestern of Neyriz... more Tang-e-Hana region is located in the Snandaj-Sirjan structural zone in the Northwestern of Neyriz in the East of Fars province. The area mainly consist of ultramafic (harzburgite, dunite, wehrlite), mafic (gabbro) and marble rocks which partly changed to skarn. Contact of ultramafic rocks and Cretaceous calcite unites cause to form marble and skarn rocks in the study area. The main
Microstructural, finite strain and vorticity analyses of quartz-rich mylonites were used in order... more Microstructural, finite strain and vorticity analyses of quartz-rich mylonites were used in order to investigate kinematics of rock flow and deformation temperature in the Sirjan thrust sheet exposed in a structural window within the Sanandaj–Sirjan High Pressure – Low Temperature (HP–LT) metamorphic belt that forms part of the hinterland of the Zagros orogenic belt of Iran. A dominant top-to-the-SW sense of shear in the study area is indicated by several shear sense indicators such as asymmetric boudins, rotated porphyroclasts, mica fish and S/C fabrics. Quantitative analyses reveal approximately plane strain deformation conditions with Rxz values ranging from 2.5 to 4.3 and increasing towards the Sirjan thrust. Opening angles of quartz c-axis fabrics and recrystallization regimes suggest deformation temperatures vary from 430 to 625 ± 50°C in the hanging wall rocks. Oblique grain shape and quartz c-axis fabrics were used to estimate the degree of non-coaxiality during deformation....
Asmari anticline shows the exclusive outcrop of the Asmari formation in the Dezful embayment. In ... more Asmari anticline shows the exclusive outcrop of the Asmari formation in the Dezful embayment. In order to estimate the strain parameters and shortening values, 26 geological cross sections were prepared perpendicular to the anticline axis. The interlimb angles of the northern and central parts of the anticline are lower than the southern parts. The strain ratio (R) is between 1.12-1.52. The strain ratio zoning map shows the higher strain values in the northern and central parts of the Asmari anticline. The length of folded layer of Asmari formation (L0) and the straight length (L1) were measured in the geological cross sections and amount of shortening were calculated in each section. Results indicate that the shortening in the different parts of the Asmari anticline is 1.8% to 12%. Shortening zonation map of the Asmari anticline shows higher shortening in the northern and central parts of the anticline than the southern parts.
This paper proposes a new method for 3D finite strain analysis. This method utilizes a Mohr circl... more This paper proposes a new method for 3D finite strain analysis. This method utilizes a Mohr circle construction combined with stereographic projection of the geometry of no finite longitudinal strain and with the strain ratio on the XZ-plane of the finite strain ellipsoid. The ...
Carbonate rocks form the central part of hydrocarbon reservoirs worldwide, about 60% (Lamarche et... more Carbonate rocks form the central part of hydrocarbon reservoirs worldwide, about 60% (Lamarche et al., 2012). Fractured reservoir contributes about 85% of hydrocarbon reservoirs. Thus, the main reason to study this type and fracture analysis is to understand the fracture behavior (Bourbiaux, 2010; Guerriero et al., 2011; Tarazona, 2017) due to their importance because of production and drilling process. Core samples, image logs, and sonic tools are the foremost valuable tools for fracture analysis in subsurface studies (Esmersoy, 1995). Of these sonic plots (e.g., compressive, shear, and Stonely waves), they have higher efficiency than other methods due to estimating the primary porosity of matrix and are sensitive to reservoir properties such as permeability (Han et al., 2018). There are available numerous research publications (
Finite strain and vorticity analyses were carried out in the deformed conglomerate and micro-cong... more Finite strain and vorticity analyses were carried out in the deformed conglomerate and micro-conglomerate of Goushti shear zone in the Sanandaj-Sirjan metamorphic belt (Zagros Mountains Iran). These deformed rocks are bounded between two NE and SW major thrust faults. Finite strain measurements on three principal planes of strain ellipsoid show the higher amounts of strain ratios near the major thrust faults. Strain ellipsoid shape (K-value) and strain intensity (D-value) of the Flinn diagram reveal more prolate shape of strain ellipsoid and more amount of strain intensity around the major thrust faults. According to the amounts of natural logarithmic strain (e), mylonite and protomylonite rocks have been formed in lower and higher distances from the main basal and dorsal faults respectively. Kinematic vorticity (Wm) analysis reveals an important strain partitioning in the Goushti shear zone. Results show simple shear dominant deformation near the major thrust faults and pure shear ...
Fractures within a reservoir play an influential role in the porosity and permeability, therefore... more Fractures within a reservoir play an influential role in the porosity and permeability, therefore affect the fluid flow. By analyzing properties of fractures, such as fracture height, density and mutually spacing and compare them with different tectonic locations and different lithologies, one could gain insight in the mechanical behavior of a rock mass, when distorted by tectonic forces. The velocity deviation log (VDL) can be used for determination of effective porosity. The result indicated that there is a high fractures density in the Asmari Formation which shows high correlation with VDL. They are mainly strike N75E, S75W direction and are chiefly observed in the upper Asmari zones. Fractures and vuggy have been also observed in the well. Image log showed a range of bedding dip from 53-89 degree with strike N55W, S55E in the well indicating of reverse limb in the field. Image log show tow set fracture which azimuth 347 for discontinuous fracture and 220 with strike N55W, S55E for continuous fracture. Main type of lithology determined by petrophysical log showed that dolomite is dominant constituent. Induced fractures and breakouts haven't seen observed in this well. After correlating image logs with VDL and lithology, zones with dominant pure dolomite presented higher aperture rather zones with dolomite and anhydrite. Fracture density is more affected by bed thickness to mineralogy. Zones with negative deviation velocity have high fracture density or high fracture aperture.
Determination of finite strain and vorticity analysis are important aims in the structural geolog... more Determination of finite strain and vorticity analysis are important aims in the structural geology to characterize the strain geometry and the partitioning of pure shear and simple shear components in the deformed area. Application of anticlines as strain markers can use to quantifying the strain parameters. In this study we suppose the earth surface as maximum principal finite strain ellipsoid
Egu General Assembly Conference Abstracts, May 1, 2010
Tang-e-Hana region is located in the Snandaj-Sirjan structural zone in the Northwestern of Neyriz... more Tang-e-Hana region is located in the Snandaj-Sirjan structural zone in the Northwestern of Neyriz in the East of Fars province. The area mainly consist of ultramafic (harzburgite, dunite, wehrlite), mafic (gabbro) and marble rocks which partly changed to skarn. Contact of ultramafic rocks and Cretaceous calcite unites cause to form marble and skarn rocks in the study area. The main
Microstructural, finite strain and vorticity analyses of quartz-rich mylonites were used in order... more Microstructural, finite strain and vorticity analyses of quartz-rich mylonites were used in order to investigate kinematics of rock flow and deformation temperature in the Sirjan thrust sheet exposed in a structural window within the Sanandaj–Sirjan High Pressure – Low Temperature (HP–LT) metamorphic belt that forms part of the hinterland of the Zagros orogenic belt of Iran. A dominant top-to-the-SW sense of shear in the study area is indicated by several shear sense indicators such as asymmetric boudins, rotated porphyroclasts, mica fish and S/C fabrics. Quantitative analyses reveal approximately plane strain deformation conditions with Rxz values ranging from 2.5 to 4.3 and increasing towards the Sirjan thrust. Opening angles of quartz c-axis fabrics and recrystallization regimes suggest deformation temperatures vary from 430 to 625 ± 50°C in the hanging wall rocks. Oblique grain shape and quartz c-axis fabrics were used to estimate the degree of non-coaxiality during deformation....
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