岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 129–139.doi: 10.12108/yxyqc.20250312

• 地质勘探 • 上一篇    

窄河道砂体中钙质夹层特征及其对储层质量的影响——以川西北梓潼地区侏罗系沙一段为例

何小龙1, 张兵1, 徐川1, 肖斌2, 田云英3, 李琢1, 何一帆1   

  1. 1. 成都理工大学 地球勘探与信息技术教育部重点实验室, 成都 610059;
    2. 中国石油吉林油田公司乾安采油厂, 吉林 乾安 131400;
    3. 中国石油西南油气田公司 川西北气矿, 四川 江油 621709
  • 收稿日期:2024-10-16 修回日期:2024-12-04 发布日期:2025-05-10
  • 第一作者:何小龙（2000－），男，成都理工大学在读硕士研究生，研究方向为地球物理勘探。地址：（610059）四川省成都市成华区二仙桥东三路1号。Email：hexiaolong@stu.cdut.edu.cn。
  • 通信作者: 张兵（1981－），男，博士，教授，主要从事沉积学与储层地质学的研究与教学工作。Email：zhangb@cdut.edu.cn。
  • 基金资助:
    中国石油西南油气田分公司川西北气矿科技项目“川西北部文兴气区沙溪庙组成藏特征及地质工程一体化研究”（编号：2023-01）资助。

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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摘要： 川西北梓潼地区侏罗系沙一段的钙质夹层对有利储层预测具有重要指示意义。通过岩心观察、测井数据分析、X射线衍射（XRD）和高压压汞实验等，对研究区窄河道砂体中钙质夹层特征及其对储层质量的影响进行了系统研究。研究结果表明：①梓潼地区侏罗系沙一段储层主要为岩屑长石砂岩与长石岩屑砂岩，储集空间以原生孔隙为主，岩石学与物性特征均表现为强非均质性，平均孔隙度为7.21%，平均渗透率为0.380 mD。②研究区岩心上钙质夹层可通过浅灰白色、致密性、高硬度及遇酸冒泡等特征进行直接识别，测井上具有低自然伽马、高电阻率和低声波时差特征，主要分布于砂体顶底部，尤其在河口坝沉积微相中易发育。③研究区砂体中可以识别出2期钙质胶结物，其中Ⅰ期方解石胶结与沉积环境密切相关，而Ⅱ期方解石胶结为后期成岩演化的产物。④根据砂体叠置关系及钙质夹层发育情况可划分出3种类型储层，Ⅰ类为平直河道垂向叠置砂体，储层质量最好，Ⅱ类为曲流河道侧向切叠砂体，质量次之，Ⅲ类为坝上河复合砂体，质量最差。

关键词: 钙质夹层, 致密砂岩, 窄河道, 沉积环境, 成岩胶结, 沙一段, 侏罗系, 梓潼地区, 川西北

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

中图分类号: 

  • TE122
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