Multi-level division method of flow units for accurate permeability assessment of glutenite reservoirs:A case study of reservoir W53 of Paleogene Wenchang Formation in Lufeng oilfield
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摘要: 中国南海东部海域陆丰油田古近系文昌组砂砾岩储层具有岩性复杂、孔隙度低、孔隙结构非均质性较强等特征。不同类型储层渗流特征差异明显,传统的孔渗模型精度难以满足生产开发需要。流动单元能有效刻画储层内部渗流特征,但单纯依据流动单元指标进行流动单元划分就会出现错划的现象。文昌组储层非均质性由宏观到微观具有层次性,综合地质、测井、岩心资料建立多层次流动单元判别法:首先基于沉积相划分第一级流动单元,然后以岩心和成像测井标定常规测井,识别岩性并划分第二级流动单元,最后基于孔隙结构,以流动单元指标FZI为依据划分第三级流动单元,由此形成了基于沉积微相—岩性—孔隙结构的三级流动单元划分方法。应用结果表明,该方法能有效避免流动单元划分不准确的现象,提高渗透率计算精度,对寻找优质产层、实现油藏高效开发具有重大意义。Abstract: The glutenite reservoirs of the Paleogene Wenchang formation in the Lufeng oilfield in the eastern South China Sea are characterized by complex lithology,low porosity,and strongly heterogeneous pore structure.Since different types of reservoirs show greatly different seepage characteristics,traditional permeability models are difficult to meet the demand for petroleum production and development due to their low calculation precision.Flow units can effectively characterize the internal seepage characteristics of reservoirs.However,the division of flow units based only on flow unit indicators will lead to misclassification.Given the macro and micro hierarchical heterogeneity of reservoirs of the Wenchang Formation,this study establishes a multi-level division method of flow units by combining geological,logging,and core data.Specifically,the first-order flow units are determined according to sedimentary facies.Then the second-order flow units are determined according to the lithology identified by calibrating conventional logging based on core and imaging logging.Finally,the third-order flow units are determined using flow zone indicator (FZI) approaches combined with pore structure.In this manner,a three-level division method of flow units based on sedimentary microfacies-lithology-pore structure is formed.As indicated by application results,this method can effectively avoid the inaccurate classification of flow units and improve the accuracy of permeability calculation,thus having great significance for finding high-quality reservoirs and the efficient development of oil reservoirs.
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Key words:
- Lufeng oilfield /
- glutenite reservoirs /
- permeability /
- flow unit /
- imaging logging
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