页岩岩相的测井曲线识别方法——以焦石坝地区五峰组-龙马溪组为例

doi:10.12108/yxyqc.20210214

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 135-146.doi: 10.12108/yxyqc.20210214

• EXPLORATION TECHNOLOGY • Previous Articles Next Articles

Identification method of shale lithofacies by logging curves: a case study from Wufeng-Longmaxi Formation in Jiaoshiba area,SW China

YANG Yang¹, SHI Wanzhong^1,2, ZHANG Xiaoming¹, WANG Ren^1,2, XU Xiaofeng¹, LIU Yuzuo¹, BAI Luheng¹, CAO Shenting¹, FENG Qian¹

1. School of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China;
2. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China

Received:2020-05-21 Revised:2020-07-13 Online:2021-04-01 Published:2021-03-31

Abstract

Abstract: Identification of shale lithofacies is the basis of shale gas exploration and development. Different types of shale have different material components and textures,and thus the brittleness and physical properties are different. At present,the study on shale lithofacies identification by logging curves is relatively weak. Based on logging data and core test data of three wells from Wufeng-Longmaxi Formation in Jiaoshiba area,through multi-parameter optimization and multivariate linear fitting,the prediction equations of relative content of clay minerals and siliceous minerals were established respectively,and the identification method of shale lithofacies by logging curves was discussed. The results show that argillaceous shale lithofacies has the characteristics of high DEN,CNL,K,KTh,and low U,U/Th,the mixed shale lithofacies has the characteristics of middle DEN, CNL,K,KTh,U,U/Th,and siliceous shale lithofacies has the characteristics of high U,U/Th and low DEN, CNL,K,KTh. Furthermore,a radar chart for shale facies identification was established. After corresponding processing,the logging curve values corresponding to different lithofacies have different distribution ranges in the chart. The chart can effectively identify shale lithofacies and correct the lithofacies identified by the prediction equation. The predicted results are in agreement with the measured values. Combining quantitative identification of lithofacies by prediction equation and qualitative identification of lithofacies by radar chart,shale lithofacies of Wufeng-Longmaxi Formation in Jiaoshiba area can be well identified through double constraints.

Key words: shale, lithofacies identification, logging, radar chart, Wufeng-Longmaxi Formation, Jiaoshiba area

CLC Number:

TE122.1

YANG Yang, SHI Wanzhong, ZHANG Xiaoming, WANG Ren, XU Xiaofeng, LIU Yuzuo, BAI Luheng, CAO Shenting, FENG Qian. Identification method of shale lithofacies by logging curves: a case study from Wufeng-Longmaxi Formation in Jiaoshiba area,SW China[J].Lithologic Reservoirs, 2021, 33(2): 135-146.

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Identification method of shale lithofacies by logging curves: a case study from Wufeng-Longmaxi Formation in Jiaoshiba area,SW China

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