基于应力场分析的叠前裂缝检测
发布时间：2018-09-07 14:15
【摘要】：裂缝在地壳中到处都有分布,它们是在漫长的地质构造运动等地质作用力的作用下形成的,裂缝型储层在世界各地广泛发育。随着油气勘探开发技术的提高,越来越多的裂缝型油气藏被发现,如柴达木盆地泥岩裂缝型油气藏,塔里木盆地奥陶系碳酸盐岩裂缝型油气藏,四川致密砂岩裂缝型油气藏等。裂缝型油气藏成为我国重要的能源战略接替勘探领域。如何解决好裂缝型油气藏储层预测,尤其是预测裂缝发育问题是裂缝型油气藏的勘探开发的主攻方向。论文结合近年来构造应力场研究的理论和方法,综合前人的成果,首先对川西北地区普光气田工区的区域地质概况进行了总结,然后利用叠前地震资料对工区构造应力场进行数值模拟,进而预测工区裂缝发育程度及方向。论文主要工作,总结如下:(1)系统地整理了当前构造应力场研究领域地应力、构造应力、构造应力场、储层裂缝及地层破裂的基本概念及原理;(2)分析了工区的构造断裂发育特征及应力场特征;(3)利用叠前不同角道集数据、测井数据、地质数据采用非线性建模技术进行叠前反演,得到纵横波阻抗、泊松比、拉梅系数、剪切模量等弹性参数;(4)采用有限元分析方法,利用FRS软件FRgeoMech模块对普光气田构造应力数值模拟,分析应力与断裂的关系,预测工区裂缝发育密度及方向;(5)利用基于局部构造熵地震不连续性检测方法检测工区断层及裂隙的发育情况,并与构造应力场数值模拟方法对比分析。论文基于构造应力场分析的叠前裂缝检测取得如下的认识:(1)利用不同角道集数据叠前反演,得到纵横波阻抗、拉梅系数、泊松比等,为做好应力场模拟地质建模提供依据;(2)根据应力场数值模拟结果,普光气田发育两组裂缝组系,即北北东向为主,北北向为辅;(3)地震相干性分析检测裂缝发育密度,同时验证应力场模拟裂缝的准确性,且相对应力场模拟其不能精确描述裂缝发育方向。
[Abstract]:Fractures are distributed everywhere in the earth's crust. They are formed under the action of geological forces such as long geological tectonic movement. The fractured reservoirs are widely developed all over the world. With the improvement of oil and gas exploration and development technology, more and more fractured reservoirs have been discovered, such as mudstone fractured reservoirs in Qaidam Basin, Ordovician carbonate fractured reservoirs in Tarim Basin, tight sandstone fractured reservoirs in Sichuan, and so on. Fractured reservoirs have become an important energy strategy replacement exploration field in China. How to solve the problem of reservoir prediction of fractured reservoirs, especially the problem of predicting the development of fractures, is the main direction of exploration and development of fractured reservoirs. Combined with the theory and method of tectonic stress field research in recent years, the paper summarizes the regional geological situation of Puguang gas field area in northwest Sichuan. Then using prestack seismic data, the tectonic stress field in the working area is numerically simulated, and the degree and direction of fracture development in the working area are predicted. The main work of this paper is summarized as follows: (1) the geostress and tectonic stress field in the field of tectonic stress field are systematically sorted out. The basic concept and principle of reservoir fracture and formation fracture; (2) the characteristics of structural fault development and stress field in the working area are analyzed; (3) the prestack inversion is carried out by using the data collected from different prestack angles, logging data and geological data using nonlinear modeling technique. The elastic parameters such as longitudinal and transverse wave impedance, Poisson's ratio, Lamy coefficient and shear modulus are obtained. (4) the structural stress of Puguang gas field is numerically simulated by using FRS software FRgeoMech module, and the relationship between stress and fracture is analyzed. (5) using seismic discontinuity detection method based on local structural entropy to detect the development of faults and fissures in the working area, and comparing with the numerical simulation method of tectonic stress field. In this paper, the prestack fracture detection based on structural stress field analysis has been realized as follows: (1) by using the data of different angle gathers, the longitudinal and transverse wave impedance, Lamy coefficient, Poisson's ratio and so on are obtained. (2) according to the results of numerical simulation of stress field, two groups of fracture groups are developed in Puguang gas field, i.e. NNE, NNE, NNE, (3) seismic coherence analysis to detect fracture density, At the same time, the accuracy of the stress field simulation fracture is verified, and the corresponding force field simulation can not accurately describe the fracture development direction.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.4
本文编号：2228500
[Abstract]:Fractures are distributed everywhere in the earth's crust. They are formed under the action of geological forces such as long geological tectonic movement. The fractured reservoirs are widely developed all over the world. With the improvement of oil and gas exploration and development technology, more and more fractured reservoirs have been discovered, such as mudstone fractured reservoirs in Qaidam Basin, Ordovician carbonate fractured reservoirs in Tarim Basin, tight sandstone fractured reservoirs in Sichuan, and so on. Fractured reservoirs have become an important energy strategy replacement exploration field in China. How to solve the problem of reservoir prediction of fractured reservoirs, especially the problem of predicting the development of fractures, is the main direction of exploration and development of fractured reservoirs. Combined with the theory and method of tectonic stress field research in recent years, the paper summarizes the regional geological situation of Puguang gas field area in northwest Sichuan. Then using prestack seismic data, the tectonic stress field in the working area is numerically simulated, and the degree and direction of fracture development in the working area are predicted. The main work of this paper is summarized as follows: (1) the geostress and tectonic stress field in the field of tectonic stress field are systematically sorted out. The basic concept and principle of reservoir fracture and formation fracture; (2) the characteristics of structural fault development and stress field in the working area are analyzed; (3) the prestack inversion is carried out by using the data collected from different prestack angles, logging data and geological data using nonlinear modeling technique. The elastic parameters such as longitudinal and transverse wave impedance, Poisson's ratio, Lamy coefficient and shear modulus are obtained. (4) the structural stress of Puguang gas field is numerically simulated by using FRS software FRgeoMech module, and the relationship between stress and fracture is analyzed. (5) using seismic discontinuity detection method based on local structural entropy to detect the development of faults and fissures in the working area, and comparing with the numerical simulation method of tectonic stress field. In this paper, the prestack fracture detection based on structural stress field analysis has been realized as follows: (1) by using the data of different angle gathers, the longitudinal and transverse wave impedance, Lamy coefficient, Poisson's ratio and so on are obtained. (2) according to the results of numerical simulation of stress field, two groups of fracture groups are developed in Puguang gas field, i.e. NNE, NNE, NNE, (3) seismic coherence analysis to detect fracture density, At the same time, the accuracy of the stress field simulation fracture is verified, and the corresponding force field simulation can not accurately describe the fracture development direction.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.4
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