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徐深气田A区块岩石力学参数及地应力研究
Study on Rock Mechanics Parameters and In-Situ Stress in Block A Xushen Gas Field
吴云龙
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作者单位:大庆油田勘探开发研究院
中文关键字:徐深气田;岩石力学参数;地应力方向;地应力大小;水平井优化设计
英文关键字:Xushen gas field; Rock mechanics parameters; In-situ stress direction; In-situ stress; Horizontal well optimization design
中文摘要:徐深气田A区块营城组火山岩储层非均质性强,单井自然产能低,岩石力学参数与地应力特征为该类储层压裂改造技术研究奠定了基础。通过岩石力学参数测试分析了工区营城组火山岩的岩石力学参数特征,定性分析了动静态岩石力学参数之间相关关系;波速各项异性结合测井解释确定了工区水平最大主应力方向,并利用声发射效应计算了水平最大、最小主应力值及应力梯度。结果表明营城组火山岩的岩石力学参数明显高于沉积岩,且火山岩中不同岩性之间岩石力学参数存在差异性,火山岩主应力随深度增加而增大,水平最大主应力为83.8MPa~96.1MPa,方向为近东西向。依据完钻井钻遇的主要岩性结合岩石力学实验参数及地应力分布特征完成储层压裂改造方案制定,建议工区施工压裂应大于87MPa,更易形成纵横交错的裂缝网络,增加储层连通性,进一步提高单井产量。研究结果对气田开发过程中施工压力预测、井网部署、水平井优化设计等实际问题具有重要指示意义。
英文摘要:The volcanic rock reservoirs of Yingcheng formation in block A Xushen gas field have strong heterogeneity and low natural productivity of single well. Rock mechanics parameters and in-situ stress characteristics lay the foundation for the study of reservoir fracturing technology. By means of rock mechanics parameters test, the characteristics of Yingcheng formation volcanic rock are studied. The correlation between dynamic and static rock mechanics parameters is analyzed qualitatively. Combined with logging interpretation, the direction of horizontal maximum principal stress is determined by wave velocity anisotropy test, and the maximum and minimum horizontal principal stress values and stress gradients are calculated by acoustic emission effect test. Results indicate that the volcanic rocks mechanics parameters are obviously higher than sedimentary rocks, and there are obvious differences in rock mechanics parameters between different lithology. The in-situ stress of volcanic rocks increases with the increase of depth, and the horizontal maximum principal stress is 83.8MPa~96.1MPa, and the direction is near east-west orientation. According to the main lithology of drilling, combined with the rock mechanics parameters and the distribution characteristics of in-situ stress, the schemes of reservoir fracturing reconstruction have been worked out. It is suggested that the fracturing pressure should be greater than 87MPa, and it is easier to form a longitudinal and transverse fracture network, increase reservoir connectivity and further improve single well production. The conclusion does make crucial sense to oilfield construction pressure prediction such as well pattern deployment and horizontal well optimization design.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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