基于應(yīng)力場分析的疊前裂縫檢測
發(fā)布時間：2018-09-07 14:15
【摘要】：裂縫在地殼中到處都有分布,它們是在漫長的地質(zhì)構(gòu)造運動等地質(zhì)作用力的作用下形成的,裂縫型儲層在世界各地廣泛發(fā)育。隨著油氣勘探開發(fā)技術(shù)的提高,越來越多的裂縫型油氣藏被發(fā)現(xiàn),如柴達木盆地泥巖裂縫型油氣藏,塔里木盆地奧陶系碳酸鹽巖裂縫型油氣藏,四川致密砂巖裂縫型油氣藏等。裂縫型油氣藏成為我國重要的能源戰(zhàn)略接替勘探領(lǐng)域。如何解決好裂縫型油氣藏儲層預(yù)測,尤其是預(yù)測裂縫發(fā)育問題是裂縫型油氣藏的勘探開發(fā)的主攻方向。論文結(jié)合近年來構(gòu)造應(yīng)力場研究的理論和方法,綜合前人的成果,首先對川西北地區(qū)普光氣田工區(qū)的區(qū)域地質(zhì)概況進行了總結(jié),然后利用疊前地震資料對工區(qū)構(gòu)造應(yīng)力場進行數(shù)值模擬,進而預(yù)測工區(qū)裂縫發(fā)育程度及方向。論文主要工作,總結(jié)如下:(1)系統(tǒng)地整理了當前構(gòu)造應(yīng)力場研究領(lǐng)域地應(yīng)力、構(gòu)造應(yīng)力、構(gòu)造應(yīng)力場、儲層裂縫及地層破裂的基本概念及原理;(2)分析了工區(qū)的構(gòu)造斷裂發(fā)育特征及應(yīng)力場特征;(3)利用疊前不同角道集數(shù)據(jù)、測井數(shù)據(jù)、地質(zhì)數(shù)據(jù)采用非線性建模技術(shù)進行疊前反演,得到縱橫波阻抗、泊松比、拉梅系數(shù)、剪切模量等彈性參數(shù);(4)采用有限元分析方法,利用FRS軟件FRgeoMech模塊對普光氣田構(gòu)造應(yīng)力數(shù)值模擬,分析應(yīng)力與斷裂的關(guān)系,預(yù)測工區(qū)裂縫發(fā)育密度及方向;(5)利用基于局部構(gòu)造熵地震不連續(xù)性檢測方法檢測工區(qū)斷層及裂隙的發(fā)育情況,并與構(gòu)造應(yīng)力場數(shù)值模擬方法對比分析。論文基于構(gòu)造應(yīng)力場分析的疊前裂縫檢測取得如下的認識:(1)利用不同角道集數(shù)據(jù)疊前反演,得到縱橫波阻抗、拉梅系數(shù)、泊松比等,為做好應(yīng)力場模擬地質(zhì)建模提供依據(jù);(2)根據(jù)應(yīng)力場數(shù)值模擬結(jié)果,普光氣田發(fā)育兩組裂縫組系,即北北東向為主,北北向為輔;(3)地震相干性分析檢測裂縫發(fā)育密度,同時驗證應(yīng)力場模擬裂縫的準確性,且相對應(yīng)力場模擬其不能精確描述裂縫發(fā)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.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13;P631.4
本文編號：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.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13;P631.4
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