Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 129-139.doi: 10.12108/yxyqc.20250312

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics of calcareous interlayer in narrow channel sand body and their influence on reservoir quality：A case study of the first member of Jurassic Shaximiao Formation in Zitong area，northwestern Sichuan Basin

HE Xiaolong1, ZHANG Bing1, XU Chuan1, XIAO Bin2, TIAN Yunying3, LI Zhuo1, HE Yifan1   

  1. 1. Key Laboratory of Earth Exploration and Information Technology, Ministry of Education, Chengdu University of Technology, Chengdu 610059, China;
    2. Qian'an Oil Product Factory, PetroChina Jilin Oilfield Company, Qian'an 131400, Jilin, China;
    3. Northwest Sichuan Division, PetroChina Southwest Oil and Gasfield Company, Jiangyou 621709, Sichuan, China
  • Received:2024-10-16 Revised:2024-12-04 Published:2025-05-10

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Abstract: The calcareous interlayers in the first member of Jurassic Shaximiao Formation in Zitong area have significant implications for favorable reservoir prediction. By combining core observation，well logging data analysis，X-ray diffraction（XRD），and mercury intrusion porosimetry，a systematic study was conducted on the characteristics of calcareous interlayer in narrow channel sand body and their influence on reservoir quality. The results show that：（1）The reservoirs in the first member of Jurassic Shaximiao Formation are primarily com‐posed of lithic feldspar sandstone and feldspar-lithic sandstone，with primary porosity as the main pore space. The petrographic and physical properties exhibit strong heterogeneity，with an average porosity of 7.21% and an average permeability of 0.380 mD.（2）Based on the core observation，the calcareous interlayers in study area can be directly identified through their light gray-white color，compactness，high hardness，and effervescence in acid. Well logging data show low natural gamma，high resistivity，and low acoustic time difference，with these interlayers mainly found at the top and bottom of the sand bodies，particularly in mouth bar sedimentary microfacies.（3）Two stages of calcareous cementation are identified in the sand bodies：Stage I calcite cementation is closely related to the depositional environment，while Stage Ⅱ calcite cementation is a product of later diagenetic evolution.（4）Based on the development of calcareous interlayers and the stacking relationships of sand bodies，three types of reservoirs are classified. Type Ⅰ，consisting of vertically stacked sand bodies in a straight river channel，has the best reservoir quality. Type Ⅱ，consisting of laterally cut sand bodies in meandering river channels，has moderate reservoir quality. Type Ⅲ，consisting of compound sand bodies in barrier-bar river systems，has the worst reservoir quality.

Key words: calcareous interlayer, tight sandstone, narrow channel, sedimentary environment, diagenetic cementation, first member of Shaximiao Formation, Jurassic, Zitong area, northwestern Sichuan Basin

CLC Number: 

  • TE122
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