文章摘要
基于微地震监测的松辽盆地新民油田水力压裂缝网形态对比与影响因素分析
Comparison and impact factor analysis of fracture geometry during hydraulic fracturing in Xinmin Oilfield, Songliao Basin based on microseismic monitoring
投稿时间:2022-09-01  修订日期:2022-09-01
DOI:
中文关键词: 松辽盆地  微地震监测  压裂缝网形态对比  影响因素分析
英文关键词: Songliao Basin  microseismic monitoring  comparison of fracture network geometry  impact factor analysis
基金项目:陕西省自然科学基础研究计划资助项目(项目编号:2019JQ-817); 陕西省教育厅科研计划项目资助(项目编号:19JK0661); 陕西省高校科协青年人才托举计划资助(项目编号:20190704)
作者单位邮编
田佳 西安石油大学 710065
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中文摘要:
      松辽盆地南部的新民油田以低孔-低渗型储层为主,需要采用水力压裂进行增产开发。微地震监测是评价致密油气藏水力压裂效果的重要技术。本次研究优选目标区域三口压裂井,针对扶余油层进行井下微地震监测,采用基于S变换的时频谱有效事件自动拾取技术和概率密度坍塌网格搜索法计算震源的空间位置,从而对压裂缝几何形态特征和动态扩展规律进行对比和分析。本次研究定性分析了压裂施工参数对压裂缝空间展布形态与复杂指数的影响,并给出累积液量和加砂总量与缝长和缝高的拟合关系。研究结果表明该研究区域的最大水平主应力方向为北东向,研究区域三口压裂井由西北至东南方向的裂缝复杂程度依次降低、裂缝规模依次增加。此外,该研究区域内的缝长和缝高与加砂总量和累计液量呈明显的线性正相关,但是缝宽和裂缝复杂指数与该压裂施工参数的关系不明显。通过本次研究形成的压裂缝扩展规律对该地区未来的水力压裂施工设计、优化和井网部署具有重要的理论和实践意义。
英文摘要:
      The reservoir of Xinmin oilfield in southern Songliao Basin is mainly of low porosity and low permeability, which requires hydraulic fracturing for stimulation and development. Microseismic monitoring is an important technique to evaluate the effect of hydraulic fracturing in tight reservoirs. In this study, three treatment wells were selected in the target area using downhole microseismic monitoring to evaluate the fracturing effect of Fuyu reservoir. This paper employs the automatic microseismic event picking methods based on S transform and the collapse grid search method to calculate the source locations for the comparison and analysis of induced fracture geometry and propagation characteristics. The influence of fracturing parameters on fracture spatial distribution and complex index is qualitatively analyzed and the fitting relationship between accumulative fluid amount and the total sand amount with the fracture length and height is also obtained in this paper. The microseismic monitoring results demonstrates that the maximum horizontal principal stress direction in this study area is northeast. From northwest to southeast, the fracture complexity of the three treatment wells in the study area decreased successively while the fracture volume increased successively. In addition, the length and height of the fractures in the study area are positively correlated with the total amount of sand and the total amount of fluid. However, the fracture width and fracture complexity index is not obviously correlated. The fracture propagation characteristics obtained by this study has important theoretical and practical significance for the design, optimization and well pattern deployment of hydraulic fracturing in the region.
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