How subsurface anticlines (oil fields) link structurally with faults is of great relevance in the exploration and development of oil fields. In this context, we investigate the geometric relation between lower Balarud (LBR), upper Balarud (UBR) and Qaleh Nar (QN) subsurface anticlines that are the main oil fields in the Northern Dezful Embayment, central Zagros. The Asmari (As) and the Bangestan (Bng) reservoirs are studied geophysically using seismic profiles, well data and underground contour maps (UGC). Interpretation of 3500 m deep seismic profiles indicates the geometry of the studied subsurface anticlines differs vertically and horizontally to a significant proportion. The interpreted structures much resemble As and Bng horizons in each anticline. The UBR got overturned on the LBR due to thrusting possibly in the Late Miocene. The LBR, like a rabbit-ear structure, is situated at the northern edge of the QN. The lower and upper Chenareh and LBR and UBR resemble structurally and are separated mutually by a steep (strike-slip) fault. The fault separates the LBR and UBR from the QN. Interaction of different factors: change in overburden pressure, rate of deformation and uplift in the different parts of the subsurface anticlines moved and accumulated Gachsaran Formation towards both limbs of the anticlines.

Anticline

10.19111/bulletinofmre.1344433

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Structural relationship between subsurface oil fields in the North Dezful Embayment: Qaleh Nar, Lower and Upper Balarud Anticlines (central Zagros, Iran)

Bulletin Of The Mineral Research and Exploration (2023)

Raana Razavi Pash Mohammad Seraj Soumyajit Mukherjee Ahmad RADMEHR

Anticline

10.19111/bulletinofmre.1348924

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Determination and Structural Analysis of the Lahijan Transverse Fault in Forestall Region of Alborz Mountains, Iran: A Geospatial Application

International Journal of Remote Sensing Application (2013)

Hojjat Ollah Safari Mohammad Ghasemi Raana Razavi Pash

The Lahijan fault zone (LFZ) is a transverse fault placed in a Forestall area of western Alborz Range, and cuts across this fold-thrust belt along the Sepid-rud valley. The results were later completed with field investigations. Analysis of the results of Geoinformatics Techniques (GiT) helped us to determine the limits and kinematics of the main fault zone and other related faults. The results showed that LFZ with N55E general strike, 90 km length and 30 km width extend from Sepid-rud dam to the Lahijan city. This fault zone, as a transversal fault, truncated and offset the western part of Alborz fold-thrust belt and thus, caused many structural complexities in this region. The results of structural investigations showed that LFZ was established as a leftlateral strike-slip fault zone. Several fault trends are generated by this tectonic regime.

10.14355/ijrsa.2013.0304.06

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Citations (6)