定量荧光录井技术在胜利油田油气勘探中的应用          下载免费PDF全文

滕玉明  张书桐  邹军  高峰 《山东国土资源》2003,19(Z1):65-67

为了更好的发现轻质油和有效的消除特殊钻井条件下钻井液中大量混入有机添加剂对荧光录井的影响,国内外录井界都在尝试一种新的录井方法———定量荧光录井技术。本文介绍了定量荧光录井技术产生的背景,检测原理和技术特点,重点介绍了定量荧光录井技术评价油水层的方法,通过近2年的试验性应用,定量荧光仪具有较高的检测灵敏度和较好的推广应用前景。  相似文献   

森林火灾对典型小流域径流影响模拟          下载免费PDF全文

周艳春  张永强  许士国 《水科学进展》2013,24(2):190-196

以澳大利亚东南部Mcmahons Creek 流域1983年发生的森林火灾为例,运用AWRA-L和新安江模型模拟火灾后流域的基准径流过程,进而估算火灾对径流的影响。AWRA-L和新安江模型模拟结果表明,火灾发生后14年(1983—1997年)内流域产水量分别增加140 mm和123 mm,占火灾前(1974—1982年)年均径流量的33%和29%;火灾发生14年后的1998—2004年,增加量分别为43 mm和33 mm,占火灾前年均径流量的10%和8%。说明森林火灾引起短期内流域径流量的明显增加,随着植被的恢复流域产流增加量减少,森林砍伐是后期径流增加的重要原因。该研究对森林流域的水资源管理具有重要的参考价值。  相似文献   

利用测井信息评价盐湖相烃源岩   总被引：1，自引：0，他引：1  

高阳 《沉积学报》2013,31(4):730-737

盐湖相烃源岩富含膏、盐质成分,使其测井响应特征发生极大改变,给测井评价烃源岩带来困难。基于实测数据,分析了盐湖相烃源岩中普遍发育的纯泥岩、含膏(盐)泥岩和膏(盐)质泥岩有机碳含量的测井响应模式,发现纯泥岩和含膏(盐)泥岩TOC与AC和LogRt呈正比,与DEN呈反比,膏(盐)质泥岩TOC与DEN呈正比,与LogRt呈反比,并基于此建立了盐湖相烃源岩测井评价方法,即首先利用ΔGR区分岩性,再针对不同岩性建立TOC评价模型,最后根据实测S₁+S₂和TOC建立相关关系,就可以求取烃源岩的TOC和S₁+S₂。利用该方法对东营凹陷沙四下亚段烃源岩性质和展布进行分析,发现预测TOC与实测TOC吻合程度高,具有一定推广价值。  相似文献   

高分辨率阵列侧向测井的数学模型及有限元快速正演   总被引：2，自引：2，他引：0       下载免费PDF全文

潘克家  王文娟  汤井田  谭永基 《地球物理学报》2013,56(9):3197-3211

对包含井眼、侵入带、围岩和目的层的轴对称地层模型, 推导了无穷远截断边界上的Robin边界条件, 建立了高分辨率阵列侧向测井的等值面边值问题模型. Robin边界条件较Dirichlet边界条件更加精确, 可大大缩小求解区域而不影响计算精度. 考虑到微分方程和边界条件为线性的, 利用叠加原理简化了原微分方程边值问题的计算, 克服了事先屏蔽电极上电流的不确定性. 采用基于地址矩阵的稀疏存贮模式, 大大减小了内存需求, 且地址矩阵物理意义明确, 方便迭代法调用求解有限元方程. 引入预条件共轭梯度(PCG)法求解有限元计算形成的大型线性方程组, 提高了测井响应的计算速度. 利用本文方法定量考察了地层厚度、井径、侵入带等因素对阵列侧向测井响应的影响, 为后续阵列侧向测井反演的研究奠定了基础, 对实际测井工程具有一定的指导意义.  相似文献   

地面电磁探测系统(SEP)研究   总被引：14，自引：9，他引：5       下载免费PDF全文

底青云  方广有  张一鸣 《地球物理学报》2013,56(11):3629-3639

近年来,大地电磁法作为深部找矿与地球电性探测的感应类电法有了迅猛的发展,国内电磁法仪器基本上都是美、加、德三国地球物理公司所生产,中国已进口了几百套这些设备.随着中国国力的增强,地面电磁探测系统的自主研制被提到议事日程.从2010年开始,中国科学院地质与地球物理研究所牵头,联合中科院院内及高校等单位在国土资源部探测技术与实验研究专项(SinoProbe)中承担了《地面电磁探测(SEP)系统研制》项目的研究,目前已取得阶段性成果.本文详尽地论述了大地电磁法仪器发展现状、系统研究目标和总体设计,SEP发射系统、感应式磁传感器、分布式电磁数据采集系统、3D EM数据正反演成像软件和可视化数据管理软件、SEP系统集成和野外测试结果,最后对地面电磁探测系统研究进行了讨论、总结和展望.  相似文献   

大斜度井中利用交叉分量快速反演井斜角          下载免费PDF全文

洪德成  肖加奇  张国艳  赵彦伟  梁小兵 《地球物理学报》2013,56(7):2494-2501

利用三维感应测井交叉分量之差响应曲线在边界附近的响应行为,建立了求解大斜度井中井斜角快速反演方法.响应曲线随真实垂直深度(TVD)变化的对数衰减率与随测量距离(MD)变化的对数衰减率与之比是井斜角的余弦函数,通过简单三角函数计算可快速反演井斜角.响应曲线形态规则,在层状各向异性地层中与垂直电导率无关,主要反映水平电导率反差造成的地层边界信息.因此本文的井斜角快速反演方法既适用于各向同性地层也适用于各向异性地层.我们考察了测井环境及仪器参数对响应曲线衰减率的影响以及衰减率估算偏差对井斜角反演精度的影响.数值模拟结果验证了该反演方法在大斜度井中的有效性和实用性.  相似文献   

随钻伽马测井快速正演算法及地质导向应用   总被引：4，自引：1，他引：3       下载免费PDF全文

邵才瑞  曹先军  陈国兴  张福明  姬嘉琦  唐建红 《地球物理学报》2013,56(11):3932-3942

在定向井及水平井钻井过程中,常采用地质导向技术;地质导向的关键在于实时确定地层界面和产状、实现地层模型的实时更新和井眼轨迹的及时调整,从而最大限度地提高油层的钻遇率.利用基于地层模型的测井响应正演曲线与随钻测井曲线进行对比是确定地层界面的有效方法;本文基于伽马射线在地层中的衰减规律,导出了不同地层模型中随钻伽马测井响应快速正演算法,克服了目前难以将蒙特卡罗算法用于实时随钻伽马测井正演的困难.应用实例表明该方法可以有效地辅助实时判定实际地层界面,更好地实现地质导向.  相似文献   

A fast integral equation solver for 3D induction well logging in formations with large conductivity contrasts     

Xiao Chun Nie  Ning Yuan  Richard Liu 《Geophysical Prospecting》2013,61(3):645-657

Simulation of induction logging responses in formations with large conductivity contrasts is an important but challenging problem due to the singularity of a linear system caused by large contrasts. Also, three‐dimensional (3D) analysis of complex geophysical structures usually encounters high computational demands. In this paper, a pre‐corrected fast Fourier transform (pFFT)‐accelerated integral equation method is applied to overcome these difficulties. In the approach, the entire formation is included in the solution domain. The volume integral equation is set up in the region based on the fact that the total field is the summation of the excitation field and the secondary field. The emitted field by the transmitter coil (treated as a magnetic dipole) is regarded as the excitation of the system. Then the method of moments (MoM) is used to solve the integral equation. To reduce the high computational requirements of the MoM, the pFFT method is used to speed up the solution of the matrix equation and reduce the memory requirement as well. The resultant method is capable of computing induction logging problems involving large and complex formations. For problems with high conductivity contrasts, the solution of the matrix equation usually converges very slow or even fails to converge due to the large condition number of the coefficient matrix. To overcome this difficulty, an incomplete LU pre‐conditioner is used to significantly speed up the convergence of the matrix equation, thus further reducing the computation time. Numerical results show that the present method is efficient and flexible for 3D simulation of induction logging and is specifically superior for problems with high conductivity contrasts.  相似文献   

Forest-Cover Change from Labor- and Capital-Intensive Commercial Logging in the Southern Chocó Rainforests*     

《The Professional geographer》2013,65(4):477-490

Abstract

This article examines two key aspects of land-cover change in the south of the Chocó region. First, it assesses and compares the local impact on forest condition of labor-intensive and capital-intensive commercial logging. Second, it assesses the regional significance and permanency of these changes. Studies of land-cover change associated with commercial logging have focused almost exclusively on capital-intensive extraction and have assumed that after logging, degraded forests are transformed into agricultural cover. This study shows that both capital- and labor-intensive logging result in similar land-cover changes (i.e., forest degradation) if the timber sought is the same. However, labor-intensive loggers also seek timber species not sought by capital-intensive loggers, and this impact is statistically different from the impact of the extraction of the first group of species. Results also show that only a small fraction (20–30 percent) of the area logged is later converted to agricultural cover types. The persistence of logged forests means that up to 20 percent of the remaining forest cover could correspond to forests with significant and lasting levels of degradation. Furthermore, the different production requirements for each group of species also mean that there is a spatial differentiation in the impact of logging in the region. Logged forests are arranged into two consecutive corridors on each side of access routes (e.g., rivers). The first corridor corresponds to a narrow (approximately 1-km) band of high-intensity degradation. The second, broader (approximately 2-km) forest band, with lower levels of degradation, extends inland along first-tier corridors. A key factor determining the permanency of this land-cover pattern is the strong control local communities have over the land in the region. This limits the spread of patterns observed in other frontier areas, especially the conversion of logged forests into agricultural cover.  相似文献   

独山子—安集海断裂带隐伏段的探测方法综合应用研究     

葛鸣  赵纯青  马新龙 《内陆地震》2013,27(1):38-44

采用浅层人工地震和高密度电法两种地球物理探测手段,结合探槽剖面结果对独山子—安集海断裂位于独山子区南侧的隐伏段进行判别。分析结果表明,独山子—安集海断裂隐伏段总体走向近东西,它是由多条南倾和北倾的逆断层组成,断裂带宽度100～160m,错断了全新世砾石层。  相似文献