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Fracture characteristics of ultra-deep reef-bank lithologic gas reservoirs in the Upper Permian Changxing Formation in Yuanba area,Northeastern Sichuan Basin
Pages: 511-516
Year: Issue:  4
Journal: Oil & Gas Geology

Keyword:  reef-bank reservoirfracture characteristicsChangxing FormationYuanba area;
Abstract: In order to understand the fracture characteristics of reef-bank reservoir in the Changxing Formation in Yuanba area ,northeastern Sichuan Basin ,this paper finely described the fractures of the Changxing Formation in many wells ,and also studied the tectonic evolution ,hydrocarbon generation ,diagenesis and the porosity evolution .Vertically ,the fractures are mainly distributed in the 2nd Member of Changxing Formation .While laterally,they show strong heterogeneity in distri-bution ,with heterogeneity being different in different blocks .Fractures are relatively well developed on structural high . The fractures can be divided into 3 types and 11 subtypes developed mainly in 3 stages.We established the classification evaluation index system and the standard identification chart of typical fractures .The formation of fractures is mainly con-trolled by the tectonic evolution,burial and dissolution.The dynamic fracture-pore assemblages of the 2nd and 3rd stages are better than that of the 1st stage.These assemblages form effective storage space or reticular carrier systems and make a positive contribution to the reservoir property and productivity .The comprehensive analysis indicates that the Changxing Formation in the northwestern Yuanba area is favorable for enrichment of oil /gas.
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