Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (2): 92-102.doi: 10.12108/yxyqc.20250209

• PETROLEUM EXPLORATION • Previous Articles    

The deposition characteristics and favorable reservoir prediction of Jurassic Shaximiao Formation in Dongguachang area, southwestern Sichuan Basin

WU Guanhua1, LIU Hong1, SONG Linke2, ZENG Qi2, YANG Tao3   

  1. 1. Sichuan Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China;
    2. Tight Oil and Gas Exploration and Development Project Department, Southwest Oil and Gas Field Branch, PetroChina, Chengdu 610500, China;
    3. Northwest Sichuan Gas Mine, Southwest Oil and Gas Field Branch, PetroChina, Jiangyou 621000, Sichuan, China
  • Received:2024-10-15 Revised:2024-12-03 Published:2025-03-06

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Abstract: In response to the unclear distribution patterns of channel sand bodies of Jurassic Shaximiao Formation in Dongguajing area of Sichuan Basin，this study utilized seismic sedimentology theory and integrated data from drilling，core samples，well logging，and seismic data. Various techniques，including seismic lithology analysis，stratigraphic slicing，and RGB attribute fusion，were employed to study the sedimentary system of the Shaximiao Formation in the research area. The results show that：（1）In the Dongguajing area，the Shaximiao Formation mainly consists of two third-order sequences（SQ1-SQ2）and five fourth-order sequences（ssq1-ssq5）. SQ1 belongs to the overall lake retreat system，while SQ2 belongs to the lake transgression system.（2） During the sedimentation period of the Shaximiao Formation，the dominant sedimentary facies in the study area were shallow-water delta deposits，which can be divided into two types：delta plain and delta front subfacies. Delta plain subfacies developed during ssq2 and ssq3，while delta front subfacies developed during ssq1，ssq4， and ssq5.（3）The development of channel sand bodies in the Shaximiao Formation is influenced by base-level cycles and sediment supply. The ssq1-ssq3 can accommodate lower space and have stronger sediment supply，resulting in larger channel sizes with overlapping and incised channel configurations. The ssq4-ssq5，on the other hand，have higher accommodation space and weaker sediment supply，leading to relatively independent and smaller channel development.（4）Large-scale connected channel sand bodies are mainly found in the channels of ssq1-ssq3，with the characteristics of good reservoir，and shoes are the favorable reservoir

Key words: seismic sedimentology, shallow-water delta, overlapping channel, incised channel, base-level cycles, sediment supply, Shaximiao Formation, Jurassic, Dongguachang area, Sichuan Basin

CLC Number: 

  • TE122.1
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