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Basic Characteristics and Classification of Hydrocarbon Reservoirs in Jiangsu Oilfield

Zhu Ping (Jiangsu Oilfield Company,SINOPEC,Jiangsu 225009, P. R. China)  
More than 20 oil gas fields, several oil pro ducing structures and spots have been discovered and developed in Jiangsu Oilfield during its over 20 years' process of exploration and development. Some sages have been formed after Subei basin goes through three developing stages, which is from down warp, fault depression and down warp. The oil gas fields mainly distribute in Gaoyou,Jinhu and Haian sag. The structures of oil gas fields generally belong to complicated small faults structure, which the basic features are much fault and small faulted blocks. Being influenced by the area structure and climate, the different reservoirs of sandrock, carbonic rock and volcanic rock are developed. Physical properties of reservoirs are closely related with the sedimentary facies and geo logic horizon. Reservoirs have normal temperature and pressure systems and the crude properties are related with structure Positions and the sag which the reservoir belongs to. Amng them, crude prop erties of reservoir in GaoyOu sag is the best, the second Jinhu, the last Haian. On the foundation of summarizing reservoir basic features, reservoir can be divided into three types by the mobility, which reacts comprehensively the properties of reservoir and crude oil.
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