Analysis on Distribution and Controlling Factors of Paleogene Reservoir, Beibuwan Basin

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Abstract

The present papers have studied characteristics of the tectonic-sedimentary evolution history in the Beibuwan basin and discussed control factors of the synsedimentary fault and sendimentation on reservoirs. The study showed that six area could be divided under the leading of source to sink system theory. Affected by Zhuqiong Motion, Beibuwan basin started rifting phase in Palaeocene Epoch, a lot of basement faults were developed and controlled the shape of red-fluvial depositional systems of Changliu formation. In late Eocene, Liushagang formation developed land-lacustrine sedimentary system with active tectonics and strong basin rift. In Oligocene, affected by Nanhai motion, regional uplifts and denudation occured in Beibuwan Basin, controlled the upgrowth of Semi-arid plain and shallow lacustrine sedimentary systems. Beibuwan Basin has gone through many stages of evolutions, the reservoir types and distribution are very complexed. Most of the reservoirs distribute in Liushagang formation and Weizhou formation. The four factors that sources, ancient landform, structure, the lake level fluctuation, and the interactions among them have played a significant controlling role in the differentiation in Beibuwan Basin reservoirs. Of which the sources and ancient landform play key-role in the controllment of sand-body distribution. Besides, the methodology that used in this study could have some effect on reservoir division and diagenesis analysis.

AAPG Datapages/Search and Discovery Article #90258 © 2016 AAPG Eastern Section Meeting, Lexington, Kentucky, September 25-27, 2016