油基钻井液环境下的复杂流体识别方法——以东海西湖凹陷为例

doi:10.11720/wtyht.2025.1196

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Abstract

With the wide application of oil-based drilling fluids in the Xihu Sag, the log response characteristics of reservoirs have changed. This increases the difficulty in identifying complex fluids, rendering fluid assessment methods based on water-based drilling fluids unapplicable. Therefore, this study developed a complex fluid identification method suitable for oil-based drilling fluids based on differences in the gas logging composition, the geochemical characteristic parameters of light hydrocarbons, and spectral morphologies between condensate gas and light oil reservoirs. The results are as follows: (1) Based on the data processing and the selection of optimal sensitive parameters, Pearson correlation analysis was conducted on 10 gas logging-derived parameters. Then, chart boards were developed using sensitive parameters Hc and Hb, allowing for qualitative distinguishment between condensate gas and light oil; (2) Through the fitting of Hc, the parameter with the highest correlation with the gas/oil ratio, to the pump sampling and stratigraphic test data, this study established a quantitative calculation model for the gas/oil ratio, yielding a correlation coefficient exceeding 0.98. Therefore, the model can be used to quantitatively predict the gas/oil ratio while drilling; (3) Significant differences can be observed in the morphological characteristics of geochemical light hydrocarbon spectra between condensate gas and light oil reservoirs. Specifically, the condensate gas reservoirs exhibited high nC1 to nC4 contents, an absence of normal alkanes beyond nC5, and incomplete and low peaks of iso-alkane and aromatic hydrocarbons due to small detection ranges. In contrast, the light oil reservoirs displayed complete n-alkanes components from nC1 to nC9, along with higher peaks of iso-alkanes and aromatics hydrocarbons. (4) Based on the differences in light hydrocarbon ratios between condensate gas and light oil reservoirs, gas index Ig and oil index Io were selected to establish chart boards, which can effectively distinguish both fluids. The combination of gas logging and geochemical light hydrocarbon analysis can effectively overcome the challenge of fluid identification under the condition of oil-based drilling fluids in the Xihu Sag, deserving wide application.

Key words： oil-based drilling fluid gas logging geochemical logging fluid identification Xihu Sag

Received: 08 May 2024 Published: 22 July 2025

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	Ying-Quan CAO
	Lei WANG
	Fa-Wei LU
	Guo-Dong ZHANG
	Xi YU
	Yi YANG
	Sheng-Bin YUAN
	She JING

Cite this article:

Ying-Quan CAO,Lei WANG,Fa-Wei LU, et al. Identification methods for complex fluids under oil-based drilling fluid conditions: A case study of the Xihu Sag in the East China Sea[J]. Geophysical and Geochemical Exploration, 2025, 49(3): 599-608.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1196 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I3/599

Comprehensive logging diagram of well B-2

Comparison of light oil samples and white oil samples of well A-1

Geochemical pyrolysis spectrum of white oil

Gas chromatogram of hydrocarbon vaporized by geochemical heat of white oil

Results of Pearson correlation coefficient calculation

Identification plate of oil and gas by gas logging

Prediction model of gas-oil ratio by gas logging

Spectrum of geochemical light hydrocarbons in different gas-oil ratios

Identification plate of oil and gas layer by geochemical light hydrocarbon logging

Comprehensive logging map (a) and geochemical light hydrocarbon map (b) of the well E2

Comprehensive logging map (a) and geochemical light hydrocarbon map (b) of the well F1

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