来凤地区龙马溪组含气页岩测井识别——以WY1井为例

doi:10.11720/wtyht.2024.1054

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Abstract

Except for the Sichuan Basin, the marine shales in the Longmaxi Formation in Hubei show great potential for shale gas exploration. Logging technology is highly mature in the exploration and development of hydrocarbons. This study systematically analyzed the log response characteristics of gas-bearing shales in the Longmaxi Formation based on logs obtained from well WY1 in the Laifeng area. As indicated by the analysis results, the gas-bearing shales of the Longmaxi Formation in well WY1 are characterized by high natural-gamma-ray values, high contents of uranium, thorium, and compensated neutrons, high interval transit time, and low density. Their deep and shallow lateral resistivity is lower than that of the underlying Baota Formation carbonate rocks but is higher than that of the sandy shales. Moreover, the positive differences indicate that high-angle fractures occur in the shales. The superimposition of log curves and the analysis of cross plots for gas-bearing shales reveal that ① the superimposed log curves of both natural gamma ray-lithologic density and interval transit time-lithologic density show significant positive differences, while those of both natural gamma ray-compensated neutrons and interval transit time-compensated neutrons show significant negative differences; ② the superimposed log curves of interval transit time-lithologic density indicate the gas-bearing intervals the most accurately; ③ the organic-rich gas-bearing shales can be identified the most effectively using the log cross plots of interval transit time-compensated neutrons, compensated neutrons-natural gamma ray, and deep lateral resistivity-compensated neutrons.

Key words： Hubei shale gas Longmaxi Formation organic-rich shale log-based identification

Received: 15 February 2023 Published: 16 April 2024

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Corresponding Authors: ZHANG Peng E-mail: peisl@glut.edu.cn;283176398@qq.com

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	Sheng-Liang PEI
	Jian-Xin QU
	Peng ZHANG

Cite this article:

Sheng-Liang PEI,Jian-Xin QU,Peng ZHANG. Log-based identification of gas-bearing shales in the Longmaxi Formation of the Laifeng area: A case study of well WY1[J]. Geophysical and Geochemical Exploration, 2024, 48(2): 403-410.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1054 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I2/403

Geological background of studying area

Comprehensive well logging in well WY1

High angle crack photo of shale in Longmaxi Formation of well WY1
a—core photo at the depth of 913.31~913.97 m,high angle shear crack filled with calcite; b—core photo at the depth of 934.49~934.92 m, parallel high angle shear cracks

Comprehensive logging interpretation for well WY1

Shale logging response characteristics of the Longmaxi Formation in well WY1

Logging identification cross plot of shale in Longmaxi Formation in well WY1

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