The relationship between spacing and bed thickness in Mozduran formation, Khur syncline, North of Mashhad

Document Type : Original Article

Authors

1 University golestan. gorgan. Iran

2 Department of Geology, Ferdowsi University of Mashhad, Iran

3 geology dept, faculty of science, Ferdowsi university of Mashhad

10.22077/jt.2025.8171.1186

Abstract

Abstract

The study of structural patterns, such as fractures in Kopeh Dagh, is important due to the existence of hydrocarbon reservoirs, especially gas ones. A field study was planned on the Khur syncline to understand the joint pattern and the relationship between spacing and bedding thickness. According to the results of field studies on fractures in this formation, two sets of fractures have been identified. These fractures are extensions and formed perpendicular to the bedding. The first set of fractures, extended N196, are systemically and perpendicular to the southern limb of the syncline. The second set consists of fractures that extended the N295 parallel to the axis of the syncline. Field inspection of the fractures shows that the second group of fractures is younger than the first group. Evidence of the relative age of fractures suggests that the second set of fractures is younger than the first set. Measurement of fracture spacing and thickness of bedding reveals a positive correlation between these two parameters. Joint spacing and joint opening are increasing with increasing bed thickness. Change of bedding thickness and effects on the joint distribution in bedding thickness and dispersion coefficient will cause a more uniform distribution of joints. Reducing the thickness of the layers affects the distribution of joints, and with its reduction and CV<1, the joints have a more uniform distribution. High values of the fracture spacing index (FSI) indicate a large difference between joint spacing and bedding thickness.

Keywords

Journal of Tectonics
Volume 7, Issue 27
November 2023
Pages 1-13

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