基于多级次流动单元的砂砾岩储层分类渗透率评价方法——以陆丰油田古近系文昌组W53油藏为例

doi:10.11720/wtyht.2022.1071

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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.

Key words： Lufeng oilfield glutenite reservoirs permeability flow unit imaging logging

Received: 26 February 2021 Published: 25 February 2022

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	Articles by authors
	Lei SHI
	Yao GUAN
	Jin FENG
	Hui GAO
	Xin-Wei QIU
	Xiao-Ming QUE

Cite this article:

Lei SHI,Yao GUAN,Jin FENG, et al. 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[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 78-86.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1071 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/78

The location and stratigraphic characteristics of Lufeng oilfield

Sedimentary microfacies and division standard of the primary flow unit of W53 Reservoir

Different lithology characteristics of conventional logging and imaging logging of W53 Reservoir

Lithologic identification chart of W53 Reservoir

Division standard of the secondary flow unit of W53 Reservoir

Relationship between porosity and permeability after secondary classification

Verification of reservoir type by mercury intrusion curve

Cumulative probability distribution of flow unit indicator

Division standard of the third flow unit of W53 Reservoir

Relationship between porosity and permeability after third classification

Stratigraphic flow unit profile (SFP) of W53 Reservoir in well X1

The comparison of flow unit type and DST results of W53 Reservoir

Comparison of calculated permeability and core permeability

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