Tectonics
Esmail Farahzadi; Seyed Ahmad Alavi; Mohammad Reza Ghassemi; Shahram Sherkati
Abstract
AbstractUnderstanding the history of uplift and folding in an area helps inferring the history of hydrocarbon genesis,migration and trapping and reducing exploratory drilling risks.Thermal model along with structural cross sections help understanding of this history and future plannings for ...
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AbstractUnderstanding the history of uplift and folding in an area helps inferring the history of hydrocarbon genesis,migration and trapping and reducing exploratory drilling risks.Thermal model along with structural cross sections help understanding of this history and future plannings for new exploration. In this paper we have used 3Dseismic reflective lines and geological maps to construct a regional balanced cross section and restore it in several stages. Combining of this cross section and a thermal model produced using vitrinite reflectance and apatite fission track, the history of exhumation and regional erosion is evaluated. Based on the results,unlike the Hormuz Series,the thickness of the Paleozoic sequence is equal throughout the region. This shows that the sedimentary-tectonic events have been the same in this period. The apatite fission track data indicate that the average time of rocks cooling is between14and24 million years ago (Late Oligocene-Middle Miocene).Based on the burial history graph, exhumation rate of the basement decrease from High Zagros to Abadan plain that show the basement in the northern part is involved in deformation earlier than in the southern part of the region. This involvement has affected the formation of structure,change of the sedimentary facies and the regional erosion pattern.
N. Kharazizadeh; M. Almasian; Sh. Sherkati
Abstract
Geometric style and deformation analysis of folding are two important aims of geological studies in Zagros, which is related to concentration of considerable of hydrocarbon reservoirs in anticlinal traps of the belt. In this study, evolution and geometry of Aghajari subsurface anticline (Dezful embayment) ...
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Geometric style and deformation analysis of folding are two important aims of geological studies in Zagros, which is related to concentration of considerable of hydrocarbon reservoirs in anticlinal traps of the belt. In this study, evolution and geometry of Aghajari subsurface anticline (Dezful embayment) is considered based on 3D seismic data and well information. Based on illustrated structural cross sections, special attention was paid to geometrical variations of folding from fold pericline to central part of this structure. Geometrical complexity along and normal to the fold axis is related to implication of intermediate soft units in sedimentary pile. Fold evolution analysis shows limb rotation and hing migration which are the main mechanism for fold growth and passing from box to chevron style as well. Development of satellite structure around main anticlines in Zagros is promising features for hydrocarbon entrapment, which related to involment of decollement levels in folding.
S. Salehi Rad; S. Sherkati; F. Taati Qoaryem; M. H. Noroozi
Abstract
The Paleozoic sediments are noteworthy for many of petroleum geologists to research within Arabian Plate during last decades. Significant values of oil and gas was generated from the Silurian source rock in this area. This source rock has been modeled by commercial software's (PetroMod and Genex) in ...
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The Paleozoic sediments are noteworthy for many of petroleum geologists to research within Arabian Plate during last decades. Significant values of oil and gas was generated from the Silurian source rock in this area. This source rock has been modeled by commercial software's (PetroMod and Genex) in Saudi Arabia and its maturity proportion determined in various locations. Maturity proportion of this source rock was not characterized truly in Persian Gulf and Zagros foreland basin. Here used geological well data of three drilled wells that one's was penetrated to the Silurian shale (Sarchahan Formation) in Persian Gulf to model and used PetroMod-1D software. These well modeling results and the Saudi Arabia results show that the rate of maturity trend for Silurian shale has increased from Saudi Arabia to Iran, so that the shale is in the recognized gas window in Persian Gulf and over-mature in some part of ZagrosBasin. In Arabian Plate basemental lowlands and highlands exist at the Pre-Cambrian time, therefore cause the maturity of this shale in older highlands than the lowlands area.
