The study and application of reservoir flow unit in complex faulted block in offshore oilfield:Taking A1/A5 faulted block of A oilfield in Beibu Gulf as an example

Dan Lingling; Li Yunxiu; Yin Yanjun; Liu Lingtong; Zhang Yu

doi:10.3969/j.issn.0253-4193.2017.12.007

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Dan Lingling, Li Yunxiu, Yin Yanjun, Liu Lingtong, Zhang Yu. The study and application of reservoir flow unit in complex faulted block in offshore oilfield:Taking A1/A5 faulted block of A oilfield in Beibu Gulf as an example[J]. Haiyang Xuebao, 2017, 39(12): 63-73. doi: 10.3969/j.issn.0253-4193.2017.12.007

Citation:

Dan Lingling, Li Yunxiu, Yin Yanjun, Liu Lingtong, Zhang Yu. The study and application of reservoir flow unit in complex faulted block in offshore oilfield:Taking A1/A5 faulted block of A oilfield in Beibu Gulf as an example[J]. Haiyang Xuebao, 2017, 39(12): 63-73. doi: 10.3969/j.issn.0253-4193.2017.12.007

Citation:

Dan Lingling, Li Yunxiu, Yin Yanjun, Liu Lingtong, Zhang Yu. The study and application of reservoir flow unit in complex faulted block in offshore oilfield:Taking A1/A5 faulted block of A oilfield in Beibu Gulf as an example[J]. Haiyang Xuebao, 2017, 39(12): 63-73. doi: 10.3969/j.issn.0253-4193.2017.12.007

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The study and application of reservoir flow unit in complex faulted block in offshore oilfield:Taking A1/A5 faulted block of A oilfield in Beibu Gulf as an example

doi: 10.3969/j.issn.0253-4193.2017.12.007

CNOOC Energy Technology-Drilling & Production Company, Tianjin 300452, China

Received Date: 2017-02-13
Rev Recd Date: 2017-06-01

Abstract

Abstract

Research on reservoir flow units in complex faulted block in offshore oilfield has very important practical significance for the studies of reservoir connectivity degree and remaining oil distribution. Taking A1/A5 faulted block of A oilfield in Beibu Gulf as an example, firstly the fine geological framework of flow unit was established through identification of the single sand body in the compound sand bodies. Then the flow unit was divided through impermeable shields formed by fault sealing, interlayers/interlining distribution and the contact relationship of sand body. We conducted parameter optimization through component analysis and correlation analysis and determined porosity, shale content and seepage coefficient as the main parameters for flow unit classification in the study area. Through neural network clustering analysis the flow unit was divided into three types. Based on the study of flow unit in single well, profile, and plane distribution, three-dimensional geological model of flow unit was established by making use of Truncated Gaussian Simulation method. The results show that type Ⅰ has the best reservoir seepage ability and provides a high cumulative production, however its distribution is limited to a potato shape in the central part of underwater distributary channels. Type Ⅱ distribution is most widely distributed in the underwater distributary channels microfacies with preferably reservoir seepage ability and much remaining oil distribution and its productive potential can be improved through adjustment and exploitation. Type Ⅲ has a banded distribution mainly in the underwater bank sand deposition area with wrost reservoir seepage capacity, low production and poor development potential.
- flow unit,
- impermeable shields,
- neural network cluster analysis,
- principal component ayalysis,
- three-dimensional geological modeling,
- complex faulted block

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References(31)

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