致密气藏水平井甜点段识别方法研究

doi:10.3969/j.issn.1672-7703.2021.03.011

摘要/Abstract

摘要： 水平井分段压裂已经成为致密气储层开发的重要方式，但由于致密气储层非均质性强，各段产能贡献差异大，有效识别水平段甜点位置，针对性优化压裂规模，成为提高压裂产能的关键。根据6口水平井57个压裂段微地震向量扫描监测结果，识别出压裂期间72处有效破裂位置。将这些点的测井、录井参数进行关联度分析，结果表明全烃和钻时对破裂位置的表征最为显著。因此利用全烃和钻时建立了水平井甜点段位置（易破裂位置）表征参数K tr的计算公式。应用结果表明：在S-13H井的K tr值异常段监测到的微地震事件明显多于其他段，表明起裂裂缝多；识别出的3个甜点发育段的产能贡献占90%以上；在其他未监测的5口水平井的产能与通过K tr值识别出的甜点段呈现较好的对应关系。通过验证，K tr法能准确识别出水平段甜点位置，对水平井选择性分段压裂和工艺优化具有指导意义。

关键词: 压裂甜点, 水平段, 分段压裂, 全烃, 钻时

Abstract: Horizontal well drilling combining with multi-staged fracturing is proved to be an important method for tight gas reservoir development. However, due to the strong heterogeneity of tight gas reservoir and the great difference in production contribution of each stage,accurately identifying the sweet spot interval of horizontal section and optimizing fracturing scale has become the key process to improve production capacity. The microseismic vector scanning monitoring was conducted for 57 stages in six horizontal wells, and 72 effective fractured intervals were identified. The correlation analysis of these intervals and the related parameters of wireline logging and mud logging data shows that total hydrocarbon and the rate of penetration (ROP) have the best correlation with those fractured intervals. Therefore,formula for calculating the parameter Ktr of sweet spot interval (easily fractured position) is established by using total hydrocarbon and ROP.The application result shows significantly more microseismic events in stages with abnormal Ktr than other stages in Well S-13H, indicating more initiated fractures, and three sweet spot intervals contribute more than 90% of the total production. In addition, production has a good relationship with the sweet spot interval identified by Ktr value in another five horizontal wells without microseismic monitoring data. It is verified that the Ktr method can accurately identify the sweet spot interval in horizontal section, which has guiding significance for selecting the fracturing stage and technology optimization of horizontal wells.

Key words: fracturing sweet spot, horizontal section, staged fracturing, total hydrocarbon, ROP

中图分类号:

TE357

刘子雄, 李啸南, 王金伟, 刘汝敏, 王涛, 王一竹, 闫治东, 李新发. 致密气藏水平井甜点段识别方法研究[J]. 中国石油勘探, 2021, 26(3): 117-125.

Liu Zixiong, Li Xiaonan, Wang Jinwei, Liu Rumin, Wang Tao, Wang Yizhu, Yan Zhidong, Li Xinfa. Study on method of sweet spot interval identification of tight gas reservoir in horizontal well[J]. China Petroleum Exploration, 2021, 26(3): 117-125.

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