岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 73–83.doi: 10.12108/yxyqc.20250307

• 地质勘探 • 上一篇    

川西新场地区三叠系须二段构造裂缝特征及定量预测

杨旭1,2, 白鸣生1,2, 龚汉渤3, 李皋1,2, 陶祖文1   

  1. 1. 西南石油大学 石油与天然气工程学院, 成都 610500;
    2. 油气钻完井技术国家工程研究中心欠平衡/气体钻井实验室, 成都 610500;
    3. 中国石化西南油气分公司, 成都 610041
  • 收稿日期:2024-08-29 修回日期:2024-11-06 发布日期:2025-05-10
  • 第一作者:杨旭（1988—），男，博士，讲师，主要从事石油工程岩石力学与工程地质力学方面的研究工作。地址：（610500）四川省成都市新都区西南石油大学石油与天然气工程学院。Email：xu.yang@swpu.edu.cn。
  • 基金资助:
    国家自然科学基金“深井超深井井筒多相瞬态流动模型与压力演变规律研究”（编号：51904264）与四川省自然科学基金项目“超深层裂缝性气层钻井复杂工况井筒瞬态流动特性及井口回压控制压力反馈规律研究（团队）”（编号：2023NSFSC0929）联合资助。

Characteristics and quantitative prediction of structural fractures in the second member of Triassic Xujiahe Formation in Xinchang area， western Sichuan Basin

YANG Xu1,2, BAI Mingsheng1,2, GONG Hanbo3, LI Gao1,2, TAO Zuwen1   

  1. 1. College of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. Underbalanced/Gas Drilling Laboratory, National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Chengdu 610500, China;
    3. Southwest Oil & Gas Branch, Sinopec, Chengdu 610041, China
  • Received:2024-08-29 Revised:2024-11-06 Published:2025-05-10

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摘要： 川西坳陷新场地区三叠系须家河组二段储层致密，其构造裂缝发育与分布特征对气藏高效开发至关重要。基于成像测井资料分析了研究区储层构造裂缝的发育特征，并在非均质岩石力学模型基础上，利用有限元模拟方法、岩石破裂准则与弹性应变能，开展了目的层在喜马拉雅时期的构造应力场、构造裂缝的数值模拟和定量预测。研究结果表明：①川西新场地区三叠系须二段裂缝以构造剪切缝为主，裂缝走向按发育程度依次为NWW向、NEE向、近EW向和近SN向；其形成期次主要包括印支晚期、燕山期、喜马拉雅早期和喜马拉雅晚期4期，前2期形成的裂缝大多被方解石或石英充填，仅喜马拉雅时期形成的裂缝为有效缝。②喜马拉雅运动时期，须二段水平最大主应力主要为65～100 MPa，水平最小主应力主要为50～85 MPa，其应力分布受构造部位和岩相控制。③研究区构造裂缝平均密度整体较小，为0.28条/m，断层附近的裂缝密度大于1.20条/m，不同岩相中的裂缝密度差异明显，断层、构造部位和岩相等因素共同控制着裂缝的分布。④裂缝预测结果与实测结果的平均绝对误差为11.40%，预测结果可靠。

关键词: 构造裂缝, 构造应力场, 数值模拟, 裂缝定量预测, 构造部位, 岩相, 须二段, 三叠系, 新场地区, 川西坳陷

Abstract: The second member of Triassic Xujiahe Formation in Xinchang area of western Sichuan Basin has dense reservoirs，the development and distribution of structural fractures are crucial for the efficient development of gas reservoirs. Based on imaging logging data，the development characteristics of reservoir structural fractures in the study area were analyzed. Based on the heterogeneous rock mechanics model，the numerical simulation and quantitative prediction of the tectonic stress field and structural fractures in the target layer during Himalayan period were carried out by using the finite element simulation method，rock fracture criterion and elastic strain energy. The results show that：（1）The fractures in the second member of Triassic Xujiahe Formation in Xinchang area of western Sichuan are mainly structural shear fractures，with fractures trending in NWW direction，NEE direction，near EW direction，and SN direction according to their development degree. The formation stages of the fractures mainly include the late Indosinian，Yanshanian，early Himalayan，and late Himalayan. The fractures formed in the late Indosinian and Yanshanian filled with calcite or quartz，and only the fractures formed in Himalayan were effective.（2）During the Himalayan movement，the maximum horizontal principal stress of the second member of Xujiahe Formation was mainly 65-100MPa，and the minimum horizontal principal stress was mainly 50-85MPa. The tectonic position and lithofacies of the strata controlled the stress distribution.（3）The average density of structural fractures in the research area is relatively small，at 0.28 fractures per meter，and the density of fractures near the faults is greater than 1.20 fractures per meter. The density of fractures in different lithofacies varies significantly. The distribution of fractures is jointly controlled by factors such as faults，tectonic position，and lithofacies.（4）The average absolute percentage error between the fracture prediction results and the measured results is 11.40%，and the prediction results are reliable.

Key words: structural fractures, structural stress field, numerical simulation, fracture quantitative prediction, tectonic position, lithofacies, the second member of Xujiahe Formation, Triassic, Xinchang area, western Sichuan Depression

中图分类号: 

  • TE122.2
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