جستجوی مقالات مرتبط با کلیدواژه "شکستگی" در نشریات گروه "میان رشته ای"

Geometric analysis of fractures in calcareous reservoirs containing hydrocarbon resources is of particular importance. Knowing the location and distribution of fractures in such reservoirs can play an effective role in providing field development plans, determining suitable sites for new drilling and reducing exploration costs. This study was carried out to evaluate the relative frequency of fractures method to identify regional fractures in the Bibihakimeh oilfield. The required data have been extracted by analyzing the underground countor maps in the Bibihakimeh oilfield. Then, the accuracy of the fracture map prepared based on this method was evaluated with the relevant data of reservoir parameters in the studied oilfields. Data on mud loss, thermal gradient, overburden thickness, total organic carbon and production index confirm results obtained from the relative frequency of fractures in the center of the oilfield. Comparison of the results with the map of basement faults in the study area shows that the performance of these regional fractures has caused curvature development and fractures concentration in some parts of the Bibihakimeh oilfield. These regional fractures act as a conduit for heat transfer from the depth to the surface, which in turn has led to a sharp increase in thermal gradient and production in wells in the central parts of the studied oilfield.

To study of relationship between mineralization and brittle structures in Torud area field studies and analysis of more than 170 planar structures (fracture, fault and dyke) were carried out. These studies show relationship between mineralising fluid flow and fractures with special orientation, as well as densely fractured zones (fault damage zones) is clearly visible in form of the precipitation of Cu–bearing minerals in the fractures. Results show preferred orientation of the NE–SW trending fractures, which are mineralized, is related to strike–slip stress field with NE–SW trending shortening axis. Also, these results show the mineralization is controlled not only by fractures as a function of local stress field but also is controlled by fault damage zones.

Nezamabad fault zone with sinistral strike-slip (Dominant Mechanism) and NE-NW striking has located in the southwest of Iran, it is considered as one of the most important structures in the Zagros fold-thrust belt. This fault has caused complex structural deformations in the region. Also, there is an evidence for fault movement in the Khaftar anticline. This study aimed to fractal analysis, the impact of the Nezamabad fault on the lineaments extracted from the satellite image of Khaftar anticline. The box-counting method is an appropriate method for analyzing the fracture pattern for this study. Using this method, fractal dimensions were calculated for different parts of the Khaftar anticline. The difference between the fractal dimensions obtained from the lineaments associated with the Nezamabad fault well identifies how this fault is affected and the areas with different structural maturity in different parts of the Khaftar anticline. So that part A and C and their southern limbs, which include the SLA and SLC parts, have more fractal dimensions than other parts of the anticline, and these areas, especially the southern limbs of parts A and C are more active than other parts. Also, the difference in fractal dimensions of the Khaftar anticline as a result of differences in density, severity, and direction of stress due to Nezamabad fault performance in the area was evaluated.

The study of the fracture systems and their spatial extensions can help in developing oilfields, reducting the costs of exploration and improving overall understanding of the hydrocarbon reservoir systems. In this study, using different tools such as Landsat OLI-8 satellite imagery, remote sensing techniques, by Geomatica and Rockwork softwares, the structural lineaments map of the Bibi Hakimeh oil field (Surface fractures of the field in Aghajari Formation), is prepare and compared by the data obtained from FMI logs (In Asmari Formation). According to the circular diagram, in Bibi Hakimeh oil field the shear fractures (SO1) and surface axial parallel fractures (SX) have the highest percentages. According to the density map, the highest lineation densities have been seen in the middle belt of the fold from the east to the west, adjacent to the axis of the fold, that are related to the tensile joints in the axis. According to studies on the density map, extraction oil wells in the Bibi Hakimeh oilfield, mainly found in the areas with the highest fracture density. Comparison between the results of the fracture process of FMI 4 logs related to Bibi Hakimeh oilfield with the results of structural studies in this study shows that the trend of fractures in FMI data in the East part are completely compatible with the results of remote sensing studies,Therefore, studies are proposed to develop extraction wells and location for the exploration of new exploratory wells in the east and in sections with high fracture density obtained in this study.

Analysis of seismic sections perpendicular to the fold axis and draw the circles surrounding on this profiles indicate the more bending in forelimb due to the more uplift in sedimentary units in effect the compression performance and thrust faults that caused fractures development and density in the southwest limb. Increasing loss of drilling mud in the forelimb anticline wells is associated with development of tensile and longitudinal fracturs related to increase in shortening and anticline uplift, thrust faults propagation and create the duplex structures in near there wells. The maximum and minimum in-situ stresses directions in well No. 2 located in the medial part of anticline are respectively N50 and N140 which are dependent on the Zagros neogene folding. Tensile-indused fractures or maximum in-situ stress direction was inclined in the eastern part of anticline and showing N30E direction. Borehole Breakout or minimum in-situ stress direction is perpendicular to tensile frauture and has N120 orientation. In the southwest part of this anticline, UGC Map is showing that contours of similar thicknesses are inclined and respect to the adjacent anticline was sinistrally displaced. Very high drilling mud losses in well NO.4 located in fold southeast plange is due to the location of this well in minimum distance to strike slip fault trace between two anticlines and due to concentrated stresses resulting from dual intraction the northeast fault lineament releated from folding and operation the sinstral fault after the zagros neogene folding.