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Abstract

The Mangala field is located in the northern part of the onshore Barmer Basin in Rajasthan. The field, with in the Rajasthan block (RJ-ON-90/1) was discovered by Cairn India Ltd. in 2004 and brought into production in 2009. Currently, production from the Rajasthan block averages ~200,000 boepd of which Mangala field is the largest contributor. The primary reservoir in the field is the Fatehgarh Formation, deposited during the rifting phase that created the Barmer Basin, in the late Cretaceous to early Paleocene period. Hydrocarbons in Mangala are trapped in an east dipping tilted fault block created during rifting. Lateral seal to the west is provided by the west dipping main bounding fault of the tilted fault block structure with juxtaposition of the tight Barmer Hill, and Dharvi Dunger Formations. Vertical seal is provided by the tight Barmer Hill formation that overlies the Fatehgarh. The bulk of reservoir oil is contained within the upper FM1 member of the Fatehgarh formation, composed of single story and multi-story stacked, meandering channel sands. These reservoir sands are of excellent quality with porosities ranging from 23% to 25 % with a permeability range of 1 to 3 Darcies. Based on well results the FM1 member consists of 3 meters to 7 meters thick individual sands with net-to-gross ranging from 18% to 78 %. Correlation of flood plain shales and fluvial sands based on well data alone in such a highly heterogenous fluvial system poses a major challenge for reservoir characterization.

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/content/papers/10.3997/2214-4609.20141698
2014-06-02
2024-03-29
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