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The Anklesvar structure, discovered productive by the Oil and Natural Gas Commission (ONGC) in May 1960, is the best hydrocarbon-bearing anticline known in the Cambay basin of India. Situated south of the Narmada River, the structure is a 15 × 2.5-km, doubly plunging, northeast-southwest-trending, asymmetric anticline limited on the south by the South Anklesvar fault system. Regional paleostructural profiles across Anklesvar from Broach on the north to Kosamba on the south suggest that, at the end of the Cretaceous, the regional slope was south. By middle Eocene time, this regional slope had been removed. After the Oligocene, the regional relief of the entire area was reversed, resulting in regional north tilt. The south Anklesvar fault system, a zone of reverse faul s, originated probably during the period of reversal. Growth of the Anklesvar anticline was, however, initiated during the Paleocene. One fault on the northern limb developed during the Oligocene. Anklesvar anticline grew into an asymmetric fold in post-Oligocene time as a result of differential movement of the blocks across the strike faults present on both the limbs of the anticline.
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