Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 95-107.doi: 10.12108/yxyqc.20250309

• PETROLEUM EXPLORATION • Previous Articles    

Lithofacies identification using conventional logging curves and its exploration significance，Triassic Chang 81 sub-member，Longdong area，Ordos Basin

ZHANG Zhaohui1,2, ZHANG Jiaosheng3, LIU Jungang3, ZOU Jiandong3, ZHANG Jianwu3, LIAO Jianbo4, LI Zhiyong4, ZHAO Wenwen1   

  1. 1. School of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China;
    2. Key Laboratory of Petroleum Resources Research, Gansu Province, Lanzhou 730000, China;
    3. Research Institute of Exploration and Development, Changqing Oilfield Branch Company of PetroChina, Xi'an 710018, China;
    4. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China
  • Received:2024-10-28 Revised:2024-11-20 Published:2025-05-10

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Abstract: Using core description，outcrop analysis，combined with logging interpretation，the types and logging response characteristic of lithofacies in tight sandstone of Chang 81 sub-member of the Yanchang Formation in the Longdong area of Ordos Basin have been classified and analyzed. Based on principal component analysis， sensitive logging parameters related to lithofacies were optimized. By leveraging the small variance characteristics of the random forest classifier and the minimal deviation of the XGBoost algorithm，a Stacking ensemble learning model was constructed to intelligently identify lithofacies. The results show that：（1）The Chang 81 submember in the Longdong area comprises six types of lithofacies：homogeneous fluvial channel lithofacies，heterogeneous fluvial channel lithofacies，homogeneous distributary mouth bar lithofacies, heterogeneous distributary mouth bar lithofacies，heterogeneous overtopping lithofacies，and mudstone lithofacies. The homogeneous fluvial channel and homogeneous distributary mouth bar facies exhibit high quartz and feldspar content，with relatively well-developed intergranular and intragranular solution pores. The average porosity is 8.32%，and the average permeability is 1.81 mD. These lithofacies represent a favorable lithofacies type，characterized by homogeneous blocky bedding formed in high-energy sedimentary environments. In contrast，the heterogeneous distributary channel lithofacies and heterogeneous distributary mouth bar lithofacies are distinguished by heterogeneous bedding formed under medium-low energy conditions.（2）In comparison to the Random Forest and XGBoost algorithms，the accuracy of the Stacking learning model in identifying lithofacies reached 94.2%. This result provides reliable methodological and technical support for characterizing lithofacies distribution.（3）The sedimentary process governs the spatial distribution of lithofacies，which serve as the material basis for sedimentary beddings. Homogeneous fluvial channel facies are predominantly developed in the central part of the distributary fluvial channel， exhibiting a banded structure that extends to the average low water level. In contrast，heterogeneous fluvial channel lithofacies are primarily located at the edges of the fluvial channel，surrounding the homogeneous fluvial channel lithofacies. The most favorable reservoir petrophysical properties，characterized by good physical attributes，are found in the overlapping areas of multiple periods of homogeneous fluvial channel lithofacies，marking them as potential regions for exploration and development.

Key words: tight sandstone, lithofacies, ensemble learning model, XGBoost algorithms, logging identification, Chang 81 sub-member, Triassic, Longdong area, Ordos Basin

CLC Number: 

  • TE122
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