川滇黔邻区龙马溪组页岩气富集主控因素与勘探方向   总被引：2，自引：2，他引：0       下载免费PDF全文

汪正江  余谦  杨平  刘伟  杨菲  刘家洪  熊国庆  何江林  邓奇 《沉积与特提斯地质》2018,38(3):1-15

中国的页岩气资源评价必须立足于中国主要陆块的地质条件与构造演化特点之上,对于不同层系、不同地区的页岩气选区评价,也必须抓住关键因素。川滇黔邻区的五峰组-龙马溪组富有机质页岩发育,但保存条件较渝东南地区更为复杂。印支期以来,该区经历了多期次构造应力场转换,断裂、褶皱发育,因此,建立针对性的页岩气选区评价参数体系是该区页岩气勘探走出困局的当务之急。本文在分析该区已有页岩气钻井成效的基础上,立足于扬子海相层系页岩气勘探应是基于保存条件的"连续型甜点区"的选区评价基本思路,结合前人研究成果,系统梳理出一套评价指标体系。该体系涵盖5大因素(区域盖层、直接盖层、底板条件、页岩层自身条件、构造改造强度)、4个等级、17个选区评价参数。另外,根据已有相关钻井数据,总结提出了5个页岩气层评价表征参数(含气量、孔隙度、电阻率、氮气组分含量和压力系数)。根据该指标体系,对川滇黔邻区的主要构造单元进行了梳理分析,优选出5个有利区,提出了各有利区的首选可能突破点。本研究对复杂构造区页岩气有利区带优选具有一定的指导意义。  相似文献   

海上油田开发井钻井优化设计和应用实践          下载免费PDF全文

董振国  熊伟  龚长芳  李进宏 《探矿工程》2021,48(7):46-57

LF7-2油田位于我国南海珠江口盆地LF区块,是一个小规模油田,根据前期探井揭示,上部地层以厚层泥岩为主,极易水化、分散,使钻井液性能变差;起下钻过程中钻具遇卡、遇阻等复杂情况频繁发生;钻头选型不尽合理,易泥包;下部地层以砂泥岩互层为主,岩石致密、可钻性变差,钻具扭矩、摩阻增加,定向钻进时滑动困难,井眼轨迹控制难度大,给钻井提速增效带来诸多困难。根据探井地质情况和岩石力学剖面,利用钻井软件优选平台位置,对开发井井身结构、井眼轨迹、钻柱力学、钻井液、固井等方面进行钻井仿真模拟,制定出科学的钻井设计方案,在直井段采用“牙轮钻头+直螺杆+MWD”钻具开展防斜打直,造斜段使用“PDC钻头+弯螺杆+MWD/LWD”开展复合钻井,水平段采用“PDC钻头+PowerDriver+MWD/LWD”开展旋转导向钻井,实现精准化钻井,顺利完成6口开发井施工。现场应用单井平均机械钻速29.43 m/h,钻井工期191.59 d,工期比设计提前28.41 d,钻井提速增效显著,降低开发成本。通过PowerDriver的近钻头井斜、自然伽马实时测量和传输,减少地质误判,实现对储层顶界面的实时探测,使储层钻遇率达100%,收到较好的经济效益和投资回报,实现小油田的效益开发。  相似文献   

天陇铁路上倪滑坡工程地质特征分析及地质选线          下载免费PDF全文

李旭方 《甘肃地质》2021,(4):67-74

在天陇铁路勘察设计工作中,发现上倪滑坡是新建天水至陇南铁路一处控制性不良地质体。本文在充分获取地质资料的基础上,从地形地貌角度出发,结合其地层岩性特征,分析了滑坡成因,认为上倪滑坡在北侧和南侧各存在一个软弱面,滑坡整体稳定性较差,尤其是滑坡北侧危险性较大。通过力学计算,显示该滑坡自然状态下能够保持相对稳定,但在地震或暴雨天气下发生滑动的可能性极大,对线路工程具有严重影响。经过对三种线路方案的综合比选,建议以深埋隧道形式从后壁通过上倪滑坡,保证工程安全性。  相似文献   

基于SRTM数据的天气雷达探测环境分析研究   总被引：4，自引：3，他引：1  

景号然  谢晓琳  郑伟  彭涛  刘娟  刘宗庆 《气象》2019,45(6):871-876

利用SRTM高程数据作为选址基础数据,结合天气雷达工作方式和探测方法,计算得到天气雷达在0.5°、1.0°、2.4°仰角上地物遮挡情况;利用高程格点数据获得3个仰角的地物剖面数据,提高了SRTM数据利用精度和运算速度;分析中结合地球曲率和电磁波折射影响,改进算法获得站点遮蔽角图,站点上空1 km、海拔3和6 km等射束高度图及数据,该分析结果充分体现了SRTM数据的高分辨率特点。最后将结果数据与GIS地图结合,完成了四川省天气雷达网探测环境分析,并给出了各个台站评估结果。  相似文献   

A generalized conditional intensity measure approach and holistic ground‐motion selection     

Brendon A. Bradley 《地震工程与结构动力学》2010,39(12):1321-1342

A generalized conditional intensity measure (GCIM) approach is proposed for use in the holistic selection of ground motions for any form of seismic response analysis. The essence of the method is the construction of the multivariate distribution of any set of ground‐motion intensity measures conditioned on the occurrence of a specific ground‐motion intensity measure (commonly obtained from probabilistic seismic hazard analysis). The approach therefore allows any number of ground‐motion intensity measures identified as important in a particular seismic response problem to be considered. A holistic method of ground‐motion selection is also proposed based on the statistical comparison, for each intensity measure, of the empirical distribution of the ground‐motion suite with the ‘target’ GCIM distribution. A simple procedure to estimate the magnitude of potential bias in the results of seismic response analyses when the ground‐motion suite does not conform to the GCIM distribution is also demonstrated. The combination of these three features of the approach make it entirely holistic in that: any level of complexity in ground‐motion selection for any seismic response analysis can be exercised; users explicitly understand the simplifications made in the selected suite of ground motions; and an approximate estimate of any bias associated with such simplifications is obtained. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

MULTIVARIATE SELECTION OF VARIABLES IN INDUSTRIAL QUALITY CONTROL:OPTIMIZING AVIATION FUEL FINAL CONTROL     

J.M.ANDRADE  D.PRADA  S.MUNIATEGUI Department of Analytical Chemistry  Universidade da Corun  La Zapateir  E- Corun  Spain  B.GOMEZ  M.PAN Analytical Laboratory  Complejo Industrial Repsol Petróleo S.A.de La Corun  Poligono Bens  Corun  Spain Author to whom correspondence should be addressed. 《地理学报(英文版)》1993,(5)

This paper deals with a typical question encountered in all industrial analytical laboratories:are all thetests performed in the laboratory to characterize the final product really necessary?In this work the cross-validation technique,Procrustes rotation techniques and statistical variable selection have been used toreduce the 26 initial British Petroleum and ASTM kerosene specification tests to ten'essential'ones.Statistical as well as chemical considerations were used to select the optimum subset of original variablesto be retained from all the possible ones.  相似文献   

近代回归分析在交通调查分析建模中的应用     

杨仁  王冬根 《武汉大学学报(信息科学版)》1990,(3)

本文以出行发生量模型的建立为例,较为系统地讨论了近代回归分析中的自变量选择及回归诊断方法在交通调查分析建模中的应用。分析了在获取调查数据后,如何借助回归自变量选择方法来选择最佳自变量子集,以确定简捷的回归模型;文中应用回归诊断方法,讨论了修正回归模型、探测错误的调查数据的方法,从而为建立简捷、高精度的交通模型打下了基础。最后,作者提出了应用自变量选择及回归诊断方法建立出行发行量模型的一般步骤。  相似文献   

An examination of the use of the logratio transformation for the testing of endmember hypotheses     

Ross M. Renner 《Mathematical Geology》1991,23(4):549-563

Given a compositional dataset in the absence of any prior information on any mixing process which may have formed it, a complete analysis of mixtures determines three distinct types of estimates in order. These are: (i) the estimate of the number of endmembers or fixed source compositions, of which all the sample compositions of the dataset must be approximate mixtures; (ii) the estimated compositions for each of these chosen number of endmembers; and (iii) the estimated contributions of each of these endmember estimates to each sample. Traditionally, the estimate for the number of endmembers has been assessed either by mapping or by inspection of the coefficients of determination between the observed and estimated variables. Mapping entails the plotting on a map of the region from which the samples were taken, either the contours of the contributions of each endmember to each sample, or some other portrayal of the distribution of endmember abundances. Because it requires the complete analysis, assessment by this method is too elaborate except for final confirmation and display. Alternatively, choosing a number of endmembers, which result in suitability high coefficients of determination for all or most variables, may account for elements which are not part of the conjectured mixing process or, worse, may result in the identification of endmembers which may never in fact have existed. Such an error is similar to overspecifying a multiple regression model. So, the obvious starting point from which to assess the validity, or otherwise choice of endmember numbers, is to examine the matrix of residuals. The differences between the logratio-transformed observed and estimated data form an array of residual logratios. A linear combination of these may be formed for each sample, which, under a random perturbation assumption, should follow a univariate normal distribution. Whether or not this scalar is normal can be readily tested. It can also be examined graphically for such desirable qualities as symmetry when the test for normality may be too severe. This procedure is employed to assess the decompositions of the U.S.G.S. Mid-Pacific data and the Nazca Plate Surface sediments.This paper was presented at the 18th Geochautauqua, Newark, Delaware, 13–14 October 1989.  相似文献   

甘肃西部地区高放废物处置库场址预选调查   总被引：1，自引：0，他引：1  

刘林清  余运祥 《华东地质学院学报》1995,18(1):33-39

本文根据高放废物处置库场址选择的基本要求，对区域地质及深部构造特征、新构造运动及地震分布规律进行了调查，确定北山南带地区为稳定区。在稳定区内根据处置库有利围岩的出露情况，结合岩体工程地质特征分析，初步选出了４个以花岗岩为主体的场址预选区。经综合分析，认为在４个场址预选区中，以Ｉ号预选区的条件最优，其次是Ⅱ号预选区，再次是Ⅲ号和Ⅳ号预选区。场址区的最后确定尚待进一步调查和论证。  相似文献   

遥感影像混合像元分解中的端元选择方法综述   总被引：7，自引：1，他引：7  

李素  李文正  周建军  庄大方 《地理与地理信息科学》2007,23(5):35-38,42

端元选择是进行遥感影像混合像元分解的首要步骤,也是最关键的步骤,其直接影响混合像元分解的精度。该文对遥感影像混合像元分解中端元产生的特定背景、当前存在的端元选择途径和端元选择方法进行综述,并通过对当前端元选择方法的分析,提出了选择或构造端元选择方法应遵循的几个原则。  相似文献