水合物气泡流三维建模及地震响应特征研究
发布时间：2018-11-20 07:15
【摘要】：近年来,针对天然气水合物的调查研究及勘探开发进展迅速。大量观测结果表明,海水中的甲烷气泡羽流与海底天然气水合物矿藏密切相关。研究气泡羽流,对寻找水合物的赋存区域、了解水合物的成藏机制和成藏环境等均有重要意义。地震方法在水合物相关的研究中,具有无可替代的优越性。为了明确水合物气泡羽流的地震响应特征,获知其地震波能量与气泡参数的定量关系,以期为实测气泡羽流地震资料偏移成像速度分析提供理论依据,本文开展了针对三维气泡羽流的建模及其波场数值模拟与地震响应特征研究。具体包括:①在前人工作的基础上,总结和分析了气泡羽流在水体中的运移规律与各项参数的变化范围,采用背景参数与随机扰动参数叠加的方式构建气泡羽流参数模型,利用姚文苇等提出的公式计算气泡羽流的速度,在Fortran和Matlab平台下编写了实现程序,建立了气泡含量变化的气泡羽流的三维模型系列。②通过反复试验,设计了较为合理的观测系统和采集参数,实现了气泡羽流的波场数值模拟。③利用叠前深度偏移剖面,采用属性分析方法分别研究了深度方向上和同一深度处模型系列中的地震波均方根振幅与气泡含量的定性和定量关系。以上研究表明:均方根振幅与气泡含量间的关系复杂,不是简单的线性关系。在所研究的气泡含量区间内,当气泡含量小于4.5*10-5时(体积分数),均方根振幅随气泡含量的增加而增大;气泡含量位于4.5*10-5到1.05*10-4范围内时,均方根振幅随气泡含量增加而减小;气泡含量大于1.05*10-4时,均方根振幅又随气泡含量的增加而增大。这种变化规律可能与气泡羽流随机扰动幅度变化有关,尚待后续研究证实。本文的研究成果为水合物气泡羽流成像速度研究提供了理论依据,也为后续基于岩石物理模型的水合物气泡羽流相关研究奠定了基础。
[Abstract]:In recent years, the investigation and exploration and development of natural gas hydrate have made rapid progress. A large number of observations show that the methane bubble plume in seawater is closely related to the marine gas hydrate deposits. The study of bubble plume is of great significance in finding the region where hydrate occurs and in understanding the mechanism and environment of hydrate formation. Seismic method has irreplaceable advantages in hydrate related research. In order to clarify the seismic response characteristics of gas hydrate bubble plume and obtain the quantitative relationship between seismic wave energy and bubble parameters, this paper provides a theoretical basis for the analysis of migration imaging velocity of measured bubble plume seismic data. In this paper, the modeling of three dimensional bubble plume, the numerical simulation of wave field and the characteristics of seismic response are carried out. The main contents are as follows: 1 on the basis of previous work, this paper summarizes and analyzes the migration law of bubble plume in water body and the variation range of each parameter, and constructs the bubble plume parameter model by the superposition of background parameter and random disturbance parameter. Using the formula proposed by Yao Wenwei and others to calculate the velocity of bubble plume, a program is compiled under the platform of Fortran and Matlab, and a series of three-dimensional models of bubble plume with varying bubble content are established. 2 through repeated experiments, A more reasonable observation system and acquisition parameters are designed, and the wave field numerical simulation of bubble plume is realized. 3 using prestack depth migration profile, The qualitative and quantitative relationships between the root-mean-square amplitude of seismic waves and bubble content in the depth direction and at the same depth are studied by means of attribute analysis. The above results show that the relationship between root-mean-square amplitude and bubble content is complex and is not a simple linear relationship. The root-mean-square amplitude increases with the increase of bubble content when the bubble content is less than 4.5 渭 10-5 (volume fraction). The root-mean-square amplitude decreases with the increase of bubble content when the bubble content is within the range of 4.5 ~ 10 ~ (-5) to 1.0 ~ (-5) ~ 10 ~ (-4), and increases with the increase of bubble content when the bubble content is greater than 1.05 脳 10 ~ (-4). This rule may be related to the variation of the random disturbance amplitude of the bubble plume, which needs to be confirmed by further studies. The results of this paper provide a theoretical basis for the study of gas hydrate bubble plume imaging velocity, and also lay a foundation for the subsequent research on gas hydrate bubble plume correlation based on rock physical model.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.4;P618.13
[Abstract]:In recent years, the investigation and exploration and development of natural gas hydrate have made rapid progress. A large number of observations show that the methane bubble plume in seawater is closely related to the marine gas hydrate deposits. The study of bubble plume is of great significance in finding the region where hydrate occurs and in understanding the mechanism and environment of hydrate formation. Seismic method has irreplaceable advantages in hydrate related research. In order to clarify the seismic response characteristics of gas hydrate bubble plume and obtain the quantitative relationship between seismic wave energy and bubble parameters, this paper provides a theoretical basis for the analysis of migration imaging velocity of measured bubble plume seismic data. In this paper, the modeling of three dimensional bubble plume, the numerical simulation of wave field and the characteristics of seismic response are carried out. The main contents are as follows: 1 on the basis of previous work, this paper summarizes and analyzes the migration law of bubble plume in water body and the variation range of each parameter, and constructs the bubble plume parameter model by the superposition of background parameter and random disturbance parameter. Using the formula proposed by Yao Wenwei and others to calculate the velocity of bubble plume, a program is compiled under the platform of Fortran and Matlab, and a series of three-dimensional models of bubble plume with varying bubble content are established. 2 through repeated experiments, A more reasonable observation system and acquisition parameters are designed, and the wave field numerical simulation of bubble plume is realized. 3 using prestack depth migration profile, The qualitative and quantitative relationships between the root-mean-square amplitude of seismic waves and bubble content in the depth direction and at the same depth are studied by means of attribute analysis. The above results show that the relationship between root-mean-square amplitude and bubble content is complex and is not a simple linear relationship. The root-mean-square amplitude increases with the increase of bubble content when the bubble content is less than 4.5 渭 10-5 (volume fraction). The root-mean-square amplitude decreases with the increase of bubble content when the bubble content is within the range of 4.5 ~ 10 ~ (-5) to 1.0 ~ (-5) ~ 10 ~ (-4), and increases with the increase of bubble content when the bubble content is greater than 1.05 脳 10 ~ (-4). This rule may be related to the variation of the random disturbance amplitude of the bubble plume, which needs to be confirmed by further studies. The results of this paper provide a theoretical basis for the study of gas hydrate bubble plume imaging velocity, and also lay a foundation for the subsequent research on gas hydrate bubble plume correlation based on rock physical model.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.4;P618.13
【参考文献】
相关期刊论文 前2条
1 顾兆峰;刘怀山;张志s，
本文编号：2344209
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