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A physical model study of effect of fracture aperture on seismic wave

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Science China Earth Sciences 2008年第S2期51卷 233-240页

作者： WEI JianXin & di bangrang CNPC Key Physical Exploration Laboratory,China University of Petroleum,Beijing 102248,China CNPC Key Physical Exploration Laboratory China University of Petroleum Beijing China

Based on Hudson’s theoretical hypothesis of equivalent fracture model,inserting aligned round chips in solid model can simulate fractured media. The effect of fractures on the propagation of P and S waves can be observed by changing the fracture thickness. The base model is made of epoxy resin,and the material of fractures is a kind of low-velocity mixture containing silicon rubber. With constant diameter and number of fractures in each model,one group of models can be formed through changing the thickness of fracture. These models have the same fracture density. By using the ultrasonic pulse transmission method,the experiment records time and waveform of P and S waves in the direction parallel and perpendicular to the fracture orientation. The result shows that,with the same fracture density,changing fracture aperture will affect both velocity and amplitude of P and S waves,and the effect on P-wave amplitude is much greater than that on the velocity. Moreover,the variation in velocity of S wave is more obvious in the slow shear wave (S2),while the variation in amplitude is more obvious in the fast shear wave (S1). These properties of wave propagation are useful for seismic data processing and interpretation.

关键词： fracture aperture Hudson’s fracture theory fractured model P-and S-wave velocity amplitude

Seismic Physical Modeling Technology and Its Applications

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Petroleum Science 2006年第2期3卷 39-46页

作者： di bangrang Wei Jianxin Mou Yongguang CNPC Key Lab of Geophysical Exploration School of Resources and Information Technology China University of Petroleum Beijing 102249 China

This paper introduces the seismic physical modeling technology in the CNPC Key Lab of Geophysical Exploration. It includes the seismic physical model positioning system, the data acquisition system, sources, transducers, model materials, model building techniques, precision measurements of model geometry, the basic principles of the seismic physical modeling and experimental methods, and two physical model examples.

关键词： Seismic physical modeling similarity principle experimental system transducer

A seismic modeling analysis of wide and narrow 3D observation systems for channel sand bodies

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Applied Geophysics 2008年第4期5卷 294-300页

作者：狄帮让徐秀仓魏建新中国石油大学(北京)油气资源与探测国家重点实验室 CNPC物探重点实验室

The effect of the wide and narrow azimuth 3D observation systems on seismic imaging precision is becoming a hot area for studies of high precision 3D seismic acquisition methods in recent years. In this paper we utilize 3D physical seismic modeling experiments. A 3D channel sand body physical seismic model is constructed and two acquisition systems are designed with wide azimuth （16 lines） and narrow azimuth （8 lines） to model 3D seismic data acquisition and processing seismic work flows. From analysis of migrated time slice data with high quality and small size, we conclude that when the overlying layers are smooth and lateral velocities have little change, both wide and narrow azimuth observation systems in 3D acquisition can be used for obtaining high precision imaging and equivalent resolution of the channel sand body.

关键词： Wide and narrow azimuth observation systems seismic imaging physicalseismic modeling time slice resolution

Experimental study on the e ect of fracture scale on seismic wave characteristics

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Petroleum Science 2008年第2期5卷 119-125页

作者： Wei Jianxin di bangrang Wang Qiang State Key Laboratory of Petroleum Resource and Prospecting CNPC Key Lab of Geophysical Exploration China University of Petroleum Beijing 102249 China

In fractured reservoir beds, fracture characteristics affect seismic wave response. Fractured models based on the Hudson＇s fractured medium theory were constructed in our laboratory by a backfilling technique. For the same fracture density, the variations of the velocity and amplitude of the primary wave and shear wave parallel and perpendicular to the fracture were observed by altering the diameter （scale） of the penny-shaped fracture disk. The model test indicated that an increase of fracture scale increased the velocity and amplitude of the primary wave by about 2%. When the shear wave propagated parallel to the fracture, the velocity of the fast shear wave hardly changed, while the velocity of slow shear wave increased by 2.6% with increasing fracture scale. The results indicated that an increase of fracture scale would reduce the degree of anisotropy of the shear wave. The amplitudes of slow shear waves propagating parallel and perpendicular to fractures decreased with increasing fracture scale.

关键词： Fracture scale Hudson's fracture theory primary wave and shear wave velocity anisotropy,model test

Wide/narrow azimuth acquisition footprints and their effects on seismic imaging

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Petroleum Science 2008年第4期5卷 308-313页

作者： di bangrang Xu Xiucang Wei Jianxin Key Laboratory of CNPC Geophysical Exploration China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum Beijing 102249 China

Acquisition footprint is a new concept to describe the seismic noise in three-dimensional seismic exploration and it is closely related to geometry and observation shuttering. At present, the study on acquisition footprints has become a hot spot. In partnership with the Dagang Oilfield, we used the channel sand body seismic physical model to study the characteristics of wide/narrow azimuth acquisition footprints and analyzed and compared the two types of footprints and their effects on target imaging. In addition, the footprints caused by data processing of the normal moveout offset （NMO） stretching aberration were discussed. These footprints are located only in the shallow or middle layer in the time slice, and possibly affect the imaging of shallow target layers, and have no influence on deep target imaging. Seismic physical modeling has its advantages in the study of acquisition footprints.

关键词： Wide/narrow azimuth geometry acquisition footprint stretching aberration time slice seismic imaging

刚度弱化边界条件在TI拟声波方程模拟中的应用

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石油物探 2024年第2期63卷 392-407页

作者：何凌毅狄帮让丁拼搏魏建新黄兴兴油气资源与探测国家重点实验室中国石油大学(北京)北京102249 CNPC物探重点实验室中国石油大学(北京)北京102249 应急管理部国家自然灾害防治研究院北京100085 复合链生自然灾害动力学应急管理部重点实验室北京100085

由于地震波数值模拟在有限区域内进行,因此减少边界反射波的影响十分重要。完美匹配层(PML)方法被广泛应用于边界反射的吸收。但在各向异性介质模拟中,PML存在稳定性问题。为此,尝试将一种刚度弱化方法(SRM)应用到拟声波各向异性方程的... 详细信息

由于地震波数值模拟在有限区域内进行,因此减少边界反射波的影响十分重要。完美匹配层(PML)方法被广泛应用于边界反射的吸收。但在各向异性介质模拟中,PML存在稳定性问题。为此,尝试将一种刚度弱化方法(SRM)应用到拟声波各向异性方程的模拟中。首先,给出了TI介质拟声波方程模拟中SRM和PML边界条件的加载方法和差分格式。模拟结果显示,SRM在内存要求和运算速度上优于PML方法。之后,通过对均匀VTI和TTI介质、层状介质以及BP模型进行数值模拟,对比分析两种方法的吸收衰减效果。对VTI介质的模拟结果显示,在本研究的实验条件下,使用同样的吸收层厚度SRM内存需求仅为使用PML方法的50%,运算耗时减少约25%。虽然在VTI条件下SRM吸收效果略逊于PML方法,但在TTI介质、层状介质以及BP模型模拟中显示出了更高的稳定性。模拟结果表明,SRM在TI介质拟声波方程模拟中具有较好的实用性和可靠性。

关键词：各向异性数值模拟刚度弱化方法(SRM) 边界条件有限差分 TTI介质

The Fluid Identification Forward Modeling Study of Carbonate Cave Reservoir

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International Journal of Geosciences 2019年第4期10卷 367-376页

作者： Xiaoming Yang Yanchun Wang Jianxin Wei bangrang di School of Geophysics and Information Technology China University of Geosciences 1 Beijing China

The fluid identification of carbonate reservoir is a key factor to hydrocarbon exploration and reservoir development. In order to simulate the seismic response characteristics of the cave in the carbonate reservoir, three sets of models were designed, including the caves varied in width, the caves filled with different solids, and the oil-gas-water model. The numerical simulation technique was used to carry out the forward modeling and the AVO (Amplitude varies with offset) response characteristics of the three groups of models were analyzed. The results show that the AVO characteristics can be observed when the cave reaches a certain extent in the horizontal direction. When the surrounding rock is constant, the absolute value of the intercept of the AVO curve increases with the Vp/Vs decrease. The AVO technology can effectively identify the gas cave. The effect is not obvious to water or oil cave.

关键词： Carbonate Reservoir Fluid Identification Numerical Simulation AVO Response

基于地震物理模拟的碳酸盐岩溶洞储层流体识别

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石油物探 2014年第1期53卷 116-124页

作者：徐超狄帮让魏建新中国石油大学(北京)油气资源与探测国家重点实验室北京102249 中国石油大学(北京)CNPC物探重点实验室北京102249

针对碳酸盐岩溶洞储层流体识别问题,开展了基于地震物理模拟数据的叠前AVO反演和叠前同步反演弹性参数属性交会分析流体识别方法研究。设计并制作了一个充填不同流体(气、油和水)的溶洞物理模型,模拟采集了溶洞模型的超声地震数据;通过... 详细信息

针对碳酸盐岩溶洞储层流体识别问题,开展了基于地震物理模拟数据的叠前AVO反演和叠前同步反演弹性参数属性交会分析流体识别方法研究。设计并制作了一个充填不同流体(气、油和水)的溶洞物理模型,模拟采集了溶洞模型的超声地震数据;通过模拟数据的叠前AVO反演和叠前同步反演,获得截距P、梯度G、纵波阻抗ZP、横波阻抗ZS、泊松比σ等多种弹性参数属性;对各种弹性参数属性分别进行两两交会分析,在交会图上划分出分别对应油、气、水的3个区域,将3个区域中的数据点投影到反演剖面中,实现溶洞不同充填流体的识别。结果表明,P-G交会、ZS-σ交会、μρ-σ交会、λρ-σ交会等识别油、气、水效果较好,因此它们均可以用于碳酸盐岩溶洞储层流体识别。

关键词：碳酸盐岩溶洞储层流体识别 AVO分析叠前反演属性交会

地震物理模型实验数据中多次转换干扰波的分析

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石油物探 2015年第1期54卷 17-23页

作者：司文朋狄帮让魏建新中国石油大学(北京)地球物理与信息工程学院北京102249 油气资源与探测国家重点实验室北京102249 CNPC物探重点实验室北京102249

多层地震物理模型的单炮记录中有一种特殊的干扰波,在埋深较浅的界面附近能量较强,在中、远偏移距上会与反射波同相轴交叉,严重影响了反射波的振幅分析。基于一个多层物理模型,在相同参数的数值模型上利用波动方程正演模拟分析这种干扰... 详细信息

多层地震物理模型的单炮记录中有一种特殊的干扰波,在埋深较浅的界面附近能量较强,在中、远偏移距上会与反射波同相轴交叉,严重影响了反射波的振幅分析。基于一个多层物理模型,在相同参数的数值模型上利用波动方程正演模拟分析这种干扰波的产生机理,并利用射线追踪方法对其传播路径进行追踪分析。结果显示这是一种经历了P-S-P多次转换过程的干扰波。分析认为,一般设计制作的多层物理模型中各层介质之间的相对波阻抗差异较大,入射纵波容易产生能量较强的透射横波,传播到下一界面时又会产生反射纵波传播上来,在浅层界面附近产生能量较强的干扰波。在地震物理模型实验数据的处理中,利用Radon滤波可以很好地去除这种多次转换干扰波。

关键词：地震物理模型数值模拟分析多次转换干扰波产生机理射线追踪