Facies-controlled volcanic reservoirs of northern Songliao Basin, NE China     

WANG Pu-jun  HOU Qi-jun  SHU Ping  HUANG Yu-long  GUO Zhen-hua  LI Jin-long College of Earth Sciences  Jilin University  Changchun  Jilin  China Jilin Petroleum Company  Songyuan  Jilin  China Daqing Petroleum Company  Daqing  HeiLongjiang  China 《东北亚地学研究》2005,(Z1)

Volcanic rocks of the late Mesozoic are very important reservoirs for the commercial natural gases including hydrocarbon, carbon dioxide and rare gases in the northern Songliao Basin. The reservoir volcanic rocks include rhyolite, andesite, trachyte, basalt and tuff. Facies of the volcanic rocks can be classified into 5 categories and 15 special types. Porosity and permeability of the volcanic reservoirs are facies-controlled. Commercial reservoirs were commonly found among the following volcanic subfacies: volcanic neck (I1) , underground-explosive breccia (I3), pyroclastic-bearing lava flow (II3), upper effusive (III3) and inner extrusive ones (IV1). The best volcanic reservoirs are generally evolved in the interbedded explosive and effusive volcanics. Rhyolites show in general better reservoir features than other types of rocks do.  相似文献   

Dissolved inorganic carbon (DIC) and its carbon isotopic composition in sediment pore waters from the Shenhu area,northern South China Sea   总被引：2，自引：0，他引：2  

Tao Yang  Shao-Yong Jiang  Jing-Hong Yang  Ge Lu  Neng-You Wu  Jian Liu  Dao-Hua Chen 《Journal of Oceanography》2008,64(2):303-310

The Shenhu area is one of the most favorable places for the occurrence of gas hydrates in the northern continental slope of the South China Sea. Pore water samples were collected in two piston cores (SH-A and SH-B) from this area, and the concentrations of sulfate and dissolved inorganic carbon (DIC) and its carbon isotopic composition were measured. The data revealed large DIC variations and very negative δ ¹³C-DIC values. Two reaction zones, 0–3 mbsf and below 3 mbsf, are identified in the sediment system. At site SH-A, the upper zone (0–3 mbsf) shows relatively constant sulfate and DIC concentrations and δ ¹³C-DIC values, possibly due to bioturbation and fluid advection. The lower zone (below 3 mbsf) displays good linear gradients for sulfate and DIC concentrations, and δ ¹³C-DIC values. At site SH-B, both zones show linear gradients, but the decreasing gradients for δ ¹³C-DIC and SO₄ ²⁻ in the lower zone below 3 mbsf are greater than those from the upper zone, 0–3 mbsf. The calculated sulfate-methane interface (SMI) depths of the two cores are 10.0 m and 11.1 m, respectively. The depth profiles of both DIC and δ ¹³C-DIC showed similar characteristics as those in other gas hydrate locations in the world oceans, such as the Blake Ridge. Overall, our results indicate an anaerobic methane oxidation (AMO) process in the sediments with large methane flux from depth in the studied area, which might be linked to the formation of gas hydrates in this area.  相似文献   

北京地区土壤背景值图的编制   总被引：4，自引：0，他引：4  

李廷芳  刘宝元 《地理学报》1989,44(1):11-21

本文对北京地区土壤背景值匿的编制进行了全面、系统的总结。编制土壤背景值图的基础资料有302十样点的无素测定值和运用计算机制图和因素分析法揭露的元素区域分布规律。土壤背景值图是采用分级统计图的形式。其制图单元：山区以母岩，平原地区以成土母质类型和土壤质地作为划分依据；背景值的数量分级采用显著性检验分级法。  相似文献   

衡山自然保护区森林土壤中动物群落研究   总被引：44，自引：0，他引：44  

王振中  张友梅 《地理学报》1989,44(2):205-213

作者通过一年的定位实验研究，初步阐明了衡山自然保护区森林土壤中动物群落的基本状况。共获得土壤动物30类，隶属于4门11纲，其中弹尾类、蝉螨类和线虫类为优势类群，占全部土壤动物捕获量的92.88％；平均土壤动物密度为67.27万个/m~3；地带性常绿林下发育的黄棕壤中土壤动物密度高达100.47万个/m~3，其次为针阔混交林和针叶林；土壤动物主要分布于森林凋落物层和土壤的腐殖质层中，向下急剧减少；在山地土壤垂直带上，土壤动物随海拔高度而变化。  相似文献   

北京地区铬的土壤化学地理   总被引：7，自引：0，他引：7  

夏增禄 《地理学报》1989,44(4):449-458

本文以化学地理学的观点，讨论了铬在土壤中的来源，分布规律，迁移和残留累积，生态和环境效应，循环与平衡，预测和评价。  相似文献   

土壤中可溶性盐类测定方法探讨          下载免费PDF全文

王立萍  刘洪林  张涛 《山东国土资源》2003,19(Z1):22-24

用水浸法测定土壤中的可溶性盐类,当土壤与加入水的质量之比为1∶6,水浸时间为24～42h,此时测定的可溶性盐类的量具有较好的准确性和可比性。  相似文献   

气测录井技术的进展及气测资料新用途的探讨          下载免费PDF全文

任光军 《山东国土资源》2003,19(Z1):51-55

过去,由于气测录井技术的限制,气测数据被认为是不可靠的,其应用的范围也因此受到了制约。现在,随着气测获取及分析技术所取得的进步,可以得到更为准确的气测数据。为了能充分利用气测资料,通过分析气测数据不同比值的深度曲线图,利用曲线的形态及趋势可以划分岩性界面、划分油气水界面、判断地层流体的渐变、推测盖层的封堵效率、预测石油是否遭受了生物降解以及对不同层位的油源进行初步分析。  相似文献   

推覆构造的特征及其与油气的关系     

汤锡元 《地球科学与环境学报》1988,(2)

推覆构造是地壳中广泛发育的一种构造型式。逆冲断层常成带地平行排列,形成逆冲带和叠瓦构造。断层多呈上陡下缓或阶梯状,底部常有滑脱构造,并在深处常收敛在一个基底逆冲断层上。推覆构造还常与飞来峰、构造窗、叠瓦构造、牵引褶皱、后冲断层和平移断层等构造现象一起产出。推覆构造不仅扩大了找油的领域,它本身对油气的生成、储集、运移、圈闭和保存条件都有着重要的影响。虽然它们有时可造成某些对油气藏不利的因素,但更经常地则是造成油气藏形成的有利条件。当然,影响油气藏形成的因素十分广泛,它不仅限于推覆构造本身的某些特征,同时还决定于许多其它地质条件。因此,不同推覆构造或同一推覆构造的不同部位,其含油气远景也是很不相同的。  相似文献   

The erodibility of some Nigerian soils: A comparison of rainfall simulator results with estimates obtained from the Wischmeier nomogram     

A. Vanelslande  R. Lal  D. Gabriels 《水文研究》1987,1(3):255-265

  相似文献   

Multiple scattering of seismic waves, variable gas saturation and ZODs: theoretical considerations and an observational methodology     

I. Lerche 《Geophysical Journal International》1986,86(2):241-261

  相似文献