基于三维缓倾斜层状等效模型的地表微震监测速度模型标定

IF 1.6 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Chunlu Wang, Yanfei Wei, Feng Sun, Xiaohua Zhou, Haiyu Jiang, Zubin Chen
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引用次数: 0

摘要

页岩气已成为天然气生产的主要来源,受到世界各国的广泛关注。水力压裂被广泛应用于油气井增产,并取得了相当大的成功。根据高精度微地震事件定位,预测压裂发展趋势和区域,评价增产效果,为后续开发提供技术指导。准确的速度模型对MS事件定位至关重要。然而,通常采用简单的速度模型,如均匀或垂直横向各向同性(VTI)速度模型来校准速度模型。尽管进行了校准,VTI模型在获得准确的质谱事件位置方面仍然面临挑战。基于页岩的结构特点,提出了一种用于地表质谱监测的局部速度模型标定算法。为了校准速度模型,实际地层界面被替换为三维缓斜面。我们使用非常快速的模拟退火来同时调整模型的速度、深度和角度参数。通过评估射孔弹位置的叠加振幅和射孔弹的定位误差,确定了理想的速度模型。为了评估我们的方法的有效性,我们在合成模型和现场数据集上进行了实验,并对定位误差进行了统计分析。结果表明,该方法明显减小了射孔弹定位误差,适用于接近微不均匀层状介质的速度模型标定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Velocity model calibration for surface microseismic monitoring based on a 3D gently inclined layered equivalent model
Abstract Shale gas has become a major source of natural gas production and has received worldwide attention. Hydraulic fracturing is widely performed to stimulate oil and gas wells with considerable success. Given high-precision microseismic (MS) event locations, we can predict the development trend and region of fracturing and evaluate the stimulation effect, thereby providing technical guidance for subsequent exploitation. An accurate velocity model is essential for MS event positioning. However, simple velocity models, such as the uniform or vertical transverse isotropy (VTI) velocity model, are generally applied to calibrate the velocity model. Despite calibration, the VTI model may still face challenges in obtaining accurate MS event locations. Based on the structural characteristics of shale, we propose a novel local velocity model calibration algorithm for surface MS monitoring. To calibrate the velocity model, the actual strata interfaces are replaced with 3D gently inclined planes. We use very fast simulated annealing to concurrently tune the velocity, depth, and angle parameters of the model. Through the assessment of both the stacked amplitude at the position of the perforation shot and the relocation error of the perforation shot, we determine the ideal velocity model. To evaluate the effectiveness of our approach, we conduct experiments on both a synthetic model and a field dataset, and statistically analyze the location error. The results show that the proposed method obviously reduces the perforation shot relocation error and is well-suited for calibrating velocity models that are close to slightly inhomogeneous layered media.
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来源期刊
Journal of Geophysics and Engineering
Journal of Geophysics and Engineering 工程技术-地球化学与地球物理
CiteScore
2.50
自引率
21.40%
发文量
87
审稿时长
4 months
期刊介绍: Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.
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