低对比度油层测录井综合识别方法研究与应用——以珠江口盆地陆丰油田为例

doi:10.11720/wtyht.2024.1164

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Abstract

The accurate identification of fluid properties is critical for reservoir evaluation.However,for the Paleogene low-porosity and low-permeability reservoirs in the Lufeng area,Pearl River Mouth Basin,the low contrast between oil and water layers in conventional logs due to the presence of high-resistivity water layers complicates the identification of oil and water layers.This study first ascertained the reservoir characteristics and genetic analysis of low-contrast oil layers.Then,it developed the Flair gas logging response equation and the Flair logging response correction method,aiming to overcome the challenge that gas logging response values of low-porosity and low-permeability reservoirs are significantly influenced by factors such as drilling rate and porosity.Given the differences in the properties and components of various fluids,this study constructed new oil-bearing and water-content indices using Flair gas logging curves.Moreover,this study characterized the geochemical chromatogram using a gamma probability distribution function and extracted the shape and scale factors to describe the chromatogram characteristics.Based on sensitivity parameters,this study plotted the characteristic parameter-based fluid property identification chart.The practical application shows that the log-based comprehensive fluid property identification method can yield satisfactory effects,achieving a compliance rate of 91.3%.Therefore,this method can be popularized.

Key words： low-contrast oil layer residual oil Flair log correction geochemical chromatogram gamma distribution fluid identification

Received: 13 May 2023 Published: 27 June 2024

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	Wei-Nan LIU
	Yao GUAN
	Dao-Li LIU
	Lei SHI
	Wei SONG

Cite this article:

Wei-Nan LIU,Yao GUAN,Dao-Li LIU, et al. Research and application of the log-based comprehensive identification method for low-contrast oil layers:A case study of the Lufeng oilfield in the Pearl River Mouth Basin[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 573-583.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1164 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/573

The regional geological map of Lufeng depression in the Pearl River Basin

The logging well L1 response characteristics of low-contrast oil layer in Lufeng depression

The comparison map of mineral content and pore characteristics of normal water,high resistivity water and oil in Paleogene of Lufeng

The formation water salinity in different wells and layers in the study area mg·L^-1

The simulation of resistivity with different salinity and saturation

The relative permeability curve characteristics of normal water,high resistivity water and oil in Paleogene of Lufeng

The fluorescence thin slice of high resistivity water layer in the study area

The relationship between gas response value and oil saturation after correction

The crossplot of fluid index and oil-bearing index of different fluid types in Lufeng Paleogene

The identification chart of Paleogene reservoir fluid in Lufeng sag

The geochemical chromatographic characteristics of different fluid types

The fitting comparison between typical atlas morphology and gamma distribution

The gamma distribution simulation of different scale factors and shape factors

The fluid identification chart of geochemical chromatographic characteristic parameter in Lufeng depression

The comparison of Paleogene fluid identification and sampling analysis in Lufeng sag

The fluid identification results comprehensive of logging well L9

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