玛湖凹陷致密砾岩油藏四维地应力场模拟研究与应用

doi:10.3969/j.issn.1002-302x.2022.02.003

摘要/Abstract

摘要： 玛湖凹陷砾岩储层具有非均质性强、地应力状态复杂等特点，为水平井压裂优化和提高采收率方案设计带来巨大挑战。基于玛湖砾岩油藏地震叠前弹性参数反演成果，建立了四维地应力场流固耦合模拟方法，实现了从全区到单井不同尺度上四维地应力场的描述和地质力学参数的动态更新。结合压裂水平井合理分段分簇原则，形成了水平井压裂变密度分段分簇优化设计技术，有效增大缝控储量，矿场应用表明，优化后的布孔方案单井效益提升20%~30%。通过四维地应力场模拟技术，突破了储层“渗流场—应力场”动态耦合描述技术难题，实现了水平井压裂开发动态地应力场表征和加密井压裂缝网预测，可为后期钻完井设计和补充能量时机/方式优化提供支撑。研究成果对玛湖砾岩油藏全生命周期开发、实现提质增效具有重要指导意义。

关键词: 玛湖砾岩, 地应力建模, 动态地应力, 岩石力学, 流固耦合

Abstract: The glutentite reservoir in Mahu Sag is characterized for its strong heterogeneity and complicated in-situ stress state. Therefore, it is a great challenge to design the horizontal well fracturing optimization and EOR plan. Based on the results from seismic prestack elastic parameters inversion of Mahu glutenite shale oil reservoir, the method for fluid-solid coupling simulation of multi-dimensional in-situ stress field is established to bring about accurate characterization of four-dimensional in-situ stress and dynamic update of geo-mechanical parameters at different scales from the whole area to a single well. With the principle for reasonable segmentation and clustering of fractured horizontal wells, the design technology to optimize variable density, segmentation and clustering of fractured horizontal wells is developed to effectively increase the fracture-controlled reserves. The on-site application indicates that the single-well production is raised by 20 to 30 percent after optimization of the perforation plan. The four-dimensional in-situ stress field simulation technology helps solve the bottleneck for dynamic coupling description of the reservoir “seepage field – stress field” and bring about characterization of dynamic in-situ stress field for fractured horizontal wells and prediction of the fracture propagation path for infill wells. The simulation technology can also support the later-on drilling and completion design and optimization of energy supplementation time/method. The research results are of important significance to full life-cycle development of Mahu glutenite shale oil reservoir and improvement of quality and economic performance.

中图分类号:

P618.13

秦勇　李保柱　胡水清　张景. 玛湖凹陷致密砾岩油藏四维地应力场模拟研究与应用[J]. 石油科技论坛, 2022, 41(2): 23-31.

Qin Yong, Li Baozhu, Hu Shuiqing, Zhang Jing. Numerical Simulation of Four-dimensional Stress Field for Tight Glutenite Reservoir in Mahu Sag, Junggar Basin[J]. Petroleum Science and Technology Forum, 2022, 41(2): 23-31.

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