Research of Architecture of Monosandbody in Meandering Reservoir and Control Factors of Remaining Oil on Fuyu Formation，Fuyu Oilfield

Abstract

Abstract:

Aiming at the technical issues of complex sandbody distribution and refounding geological system of meandering-river-facies reservoir, Fuyu reservoir is divided into 4 sand members and 13 layers through studying hierarchical subdivision that is based on building of continental basin and form of meandering-river-facies reservoir. Focused on internal reservoir architecture and based on the research of the core analysis, dense well pattern logs and production performance analysis, the paper discussed hierarchy bounding surfaces, lithofacies associations, spatial distribution and configuration relationships of point-bar monosandbody systematically, meanwhile the distribution of remaining oil was also studied. It is shown that the monosandbody of point-bar which was formed under weak dynamic environment, containing about 3-4 lateral accretion units with 3.5°-6.2° angle and bigger different scale in plane, was controlled by two-level depositional bounding surfaces. Isolating sandbody, lapping sandbody, stacking sandbody and cut-stacking sandbody are the four main types of monosandbodies. The remaining oil is mainly allocated in point bar, isolating, lapping, stacking and cut-stacking monosandbody under the influence of interlayers, lateral accretion surfaces and injector-producer pairs, which formed the foundation of the redevelopment of mature oil reservoir.

Key words: meandering-river reservoir, hierarchical subdivision, architecture of monosandbody, configuration, remaining oil

CLC Number:

TE121.3

HAN Jie,WANG Jing-Yao,LI Jun,JIANG You-Wei,ZHENG Chang-Long,WANG Feng-Gang. Research of Architecture of Monosandbody in Meandering Reservoir and Control Factors of Remaining Oil on Fuyu Formation，Fuyu Oilfield[J]. Geoscience, 2011, 25(2): 308-314.

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