Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 87-98.doi: 10.12108/yxyqc.20240509

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Reservoir characteristics and main controlling factors of Jurassic Shaximiao Formation in Wubaochang area，northeastern Sichuan Basin

ZHANG Xiaoli1, WANG Xiaojuan1, ZHANG Hang2, CHEN Qin3, GUAN Xu1, ZHAO Zhengwang1, WANG Changyong4, TAN Yaojie4   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    2. Northeast Sichuan Gas District, PetroChina Southwest Oil and Gas Field Company, Dazhou 635000, Sichuan, China;
    3. Development Division, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    4. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
  • Received:2023-06-28 Revised:2023-10-25 Online:2024-09-01 Published:2024-09-04

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Abstract: The tight sandstone of Jurassic Shaximiao Formation in northeastern Sichuan Basin has great exploration potential. The reservoir characteristics of Jurassic Shaximiao Formation in Wubaochang area of northeastern Sichuan Basin were studied by using analysis and testing data such as cast thin sections，scanning electron microscopy，cathodoluminescence，X-ray diffraction，properties，mercury injection and homogenization temperature of inclusions. Combined with seismic interpretation results，the reasons for reservoir densification and the distribution characteristics of high-quality reservoirs were analyzed. The results show that：（1）The sandstone reservoirs of Jurassic Shaximiao Formation in Wubaochang area of northeastern Sichuan Basin are characterized by high contents of feldspar and rock debris，general sorting and roundness，low structural maturity and compositional maturity，poor porosity and permeability correlation and poor pore structure，with reservoir porosity mostly less than 6%，permeability mostly less than 1 mD，and mainly developed fractured-porous reservoir.（2）The reservoirs of Jurassic Shaximiao Formation in the study area are in the middle diagenetic stage A. Calcareous cementation leads to local densification of the reservoirs，while burial compaction and laumontite cementation are the main causes for sandstone densification in Shaximiao Formation. Oil and gas continued to charge before and after reservoir densification.（3）Early chlorite rim cementation，atmospheric water leaching and tectonic rupture are the main constructive diagenesis，which are of great significance for the preservation of primary intergranular pores，the formation of secondary dissolved pores and the improvement of reservoir permeability.（4）Sedimentary microfacies，diagenesis and tectonic rupture control the distribution of high-quality reservoirs. The underwater distributary channel with early chlorite rim cementation，weak laumontite cementation，feldspar dissolution and fractures developed is the main development area of high-quality sandstone reservoirs.

Key words: tight sandstone, underwater distributary channels, chlorite rim cementation, compaction, laumontite cementation, tectonic rupture, Shaximiao Formation, Jurassic, Wubaochang area, Sichuan Basin

CLC Number: 

  • TE122.2
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