松辽盆地北部登娄库组砂岩次生孔隙形成时期与油气成藏     

王成赵海玲  邵红梅洪淑新 张静潘会芳  杨连华王平 乔建华 《岩石矿物学杂志》2007,26(3):253-258

利用与油气包裹体同期形成的盐水溶液包裹体均一化温度,结合本地区埋藏史和热史,确定登娄库组三、四段砂岩天然气成藏期为96~81.5Ma,并可细分为3期(分别为93~91Ma、88.8~82.8Ma和82.3~81.5Ma),前两期持续时间长,第3期时间相对较短。根据次生孔隙发育带分布宏观上受T4断层控制、微观上呈发育→较发育→不发育旋回性分布的特点判断,裂缝是酸性流体的运移通道,早期T4断层的形成时期是次生孔隙大量形成的时期:其中青山口组青一段沉积时期储盖匹配性最好,形成的次生孔隙与油气注入时期匹配,易形成气层;姚家组沉积时期储盖匹配关系好,但气源可能不足,该期形成的次生孔隙可能会形成低产气层或气水同层;登娄库组沉积时期储盖匹配性差,形成的次生孔隙难以保存,最终会形成干层。  相似文献   

低阻油层双侧向测井的反演研究   总被引：8，自引：4，他引：8  

张友生  魏斌  杨慧珠 《地球物理学进展》2003,18(1):85-89

对于双侧向测井反演，本文将广义逆反演方法用于消除侵入影响的三参数(侵入半径、侵入带电阻率、原状地层电阻率)反演中。通过实际多口井连续曲线的反演处理表明，本文提出的反演方法令理而且有效。同时，广义逆方法提高了反演计算的稳定性和精度。对低阻油层实际资料的处理结果与试油结论一致。  相似文献   

赤道太平洋次表层海水温度异常的信号通道   总被引：13，自引：3，他引：13       下载免费PDF全文

陈锦年  宋贵霆  褚健婷  许兰英 《水科学进展》2003,14(2):152-157

应用热带太平洋上层XBT温度资料,分析探讨了西太平洋暖池区次表层海温冷暖异常信号的变化规律,揭示了影响西太平洋暖池区次表层海温冷变异常的信号通道。分析表明,西太平洋暖池区的次表层海温异常变冷与太平洋北赤道流的海温冷异常信号西传有重要关系。北赤道流的海温异常冷(暖)信号是沿温跃层由赤道中东太平洋潜沉向西太平洋暖池区传播,与西太平洋次表层海温异常(冷)暖信号向赤道中东太平洋传播构成了热带海洋信号的气旋式"环流通道"。在这一"环流通道"中,北赤道流的海温异常信号西传是导致西太平洋暖池区及西太平洋次表层海温异常的重要机制,是影响厄尔尼诺(ElNino)和拉尼娜(LaNina)事件发生的关键。  相似文献   

京、沪两地脑卒中发病率及其预测模型   总被引：2，自引：2，他引：2       下载免费PDF全文

叶殿秀杨贤为  吴桂贤 《气象科技》2003,31(6):381-384

通过分析比较北京、上海两地脑卒中病例资料和气象资料，揭示两地脑卒中发病率的总体水平、季节变化特点和多年变化趋势。在综合考虑该病症发病率自身演变规律及气象因子可能施加影响的基础上设计的短期气候预测模型，不但能较好地拟合发病率的实况，而且对未来时段的发病率具有一定的预测能力，但在预报精度上，两地的预测模型存在一定的差异。  相似文献   

On container versus time based inspection policies in invasive species management     

Amitrajeet A. Batabyal  Peter Nijkamp 《Stochastic Environmental Research and Risk Assessment (SERRA)》2005,19(5):340-347

We study the problem of precluding biological invasions caused by ships transporting internationally traded goods in containers between different regions of the world. Using the long run expected net cost (LRENC) of inspections as the apposite managerial objective, we address the following important question: given that inspection is a cyclical activity, is the LRENC lower when a port manager’s inspector inspects cargo upon the arrival of a specified number of containers (container policy) or is this LRENC lower when this inspector inspects cargo at fixed points in time (temporal policy)? We construct a queuing theoretic model and show that in an inspection cycle, irrespective of whether the inspection policy choice is made on the basis of an explicit optimization exercise or on the basis of rules of thumb, the container policy is superior to the temporal policy because the container policy results in lower LRENC from inspection activities.  相似文献   

渤中25-1地区油气运移的输导通道及其示踪分析   总被引：1，自引：0，他引：1  

张成  解习农  张功成  刘晓峰  姜涛 《地质科技情报》2005,24(2):27-32

渤中25-1地区是渤中坳陷重要的含油气区,具有复杂的构造演化与沉积充填史,输导通道一直是该地区成藏动力学研究的关键.采取宏观与微观相结合的研究思路,在理清研究区构造演化、沉积充填及其油气地质特征的基础上,讨论了油气运移的输导通道并对其进行了示踪分析,进而总结了该区的油气成藏模式.研究表明,长期继承性活动的基底断层是油气垂向运移的主输导通道,原油性质及地层水化学特征证实了断层的输导作用.上新统明化镇组和渐新统沙河街组渗透性储层是油气侧向运移的主要通道.沙河街组油藏具有自源压控侧向运移成藏的特点,明化镇组油藏具有它源断控垂向运移成藏的特点.  相似文献   

Estimating contributions of sources of soil CO2 at the shallower layer in a Japanese larch forest area     

Wei LIU Jun MORIIZUMI Hiromi YAMAZAWA Takao IIDA 《中国地球化学学报》2006,25(B08):198-198

Soils contain about twice the amount of carbon presented in the atmosphere, so a small change in the soil carbon will influence atmospheric chemistry and heat balance. The soil carbon ultimately exchanged with the atmospheric CO2 as soil CO2, which mainly exists at the depth of 0-20 cm. The transport of soil CO2 is affected by the sources of soil CO2. Thus, separation of the contributions of sources of soil CO2 is a fundamental need to understand and predict implications of environmental change on soil carbon cycling and sequestration. It is a complicated task, so that a number of different methodological approaches such as component integration, root removal, and gap analyses have been developed. However, these methods could not avoid changing soil characteristics such as air-filled porosity, soil temperature and soil water contents. Consequently, fractional contributions of respiration of living root and decomposition of soil organic matter to the total soil CO2 cannot be estimated correctly. In this study, based on mass balance theory of both concentrations and δ^13C of soil CO2, a trenching method with a stable-isotope technique was used to determine both soil CO2 sources at the depth of 3-13 cm in a Japanese larch forest area during 30 May to 7 October 2005 and fractional contributions of these sources. Experimental results showed that the amount of atmospheric CO2 invaded the soil air was not significantly variable while its percent rate in the total soil CO2 had significantly temporal variations with the lower values between 5 August and 1 September. The litter-layer decomposition was very small. The soil CO2 derived from the respiration of living root and the decomposition of soil organic matter showed significantly temporal variations with increase from 30 May to 5 Aug. and decrease from 1 September to 7 October, 2005; and it accounted for 82%-98% of the total soil CO2 in which the respiration of living root was in the range from 32% to 62%.  相似文献   

Mechanism of the water invasion of Gaoyang Iron Mine,China and its impacts on the mine groundwater environment   总被引：1，自引：0，他引：1  

He Keqiang  Guo Dong  Wang Xianwei 《Environmental Geology》2006,49(8):1163-1172

With the development of mining of iron deposits in China, groundwater invasion and the impacts of groundwater drainage, such as regional groundwater table lowering, overlapping cones of depression, subsidence, and water quality deterioration are environmental problems which endanger mining production and human life. Effective prevention of water invasion or timely determination of the mechanism of water bursting and rational design of drainage plans are the most urgent mining challenges. The mechanism of water invasion and the environment impacts on the groundwater system of the Gaoyang Iron Mine, China were dealt with in this paper. A systematical investigation of the hydrogeological conditions and monitoring of groundwater dynamics of the mine were completed. Results show that the limestone of the middle Ordovician System constitutes the under floor of the iron deposit. This limestone is the main source of water invasion into the mine. Groundwater dynamic equilibrium conditions are broken due to mine drainage. Water invasion and drainage have caused a serious impact on the groundwater environment of the area.  相似文献   

草原农垦区土地沙质荒漠化过程的生物学机制   总被引：11，自引：1，他引：10  

赵文智  何志斌  李志刚 《地球科学进展》2003,18(2):257-262

以沙质荒漠化正处在发展过程的河北坝上地区和沙质荒漠化严重的科尔沁沙地流沙治理区为例,结合国内外已有的研究成果,探讨草原沙质荒漠化的主要生物学机制。指出在草原农垦区开垦和过度放牧引起的土壤细颗粒物质、养分损失,促进了灌木侵入。灌木侵入又加剧了土壤养分、水分空间格局的改变,在灌丛周围形成一个包括微生物在内的土壤肥力富集区,即灌丛"土壤肥岛",而在丛间发生土壤风蚀和水蚀,导致斑块状流沙甚至大面积流沙的出现。诱发荒漠化的不合理耕作、灌溉、盐渍化、过度放牧等过程同样影响菌根菌的密度和接种成功率,从而降低草地生产力。在草原地区的流沙上建立各种固沙植被不仅使流沙地土壤养分、水分异质性加强,而且使沙地景观异质性增加。还提出用土壤颗粒分形维数来表征土地沙质荒漠化的程度,以空间上不同样点土壤属性变异系数（方差与平均值之比）作为沙质荒漠化土壤属性异质性的测度。  相似文献   

徐深大气田形成的有利地质条件   总被引：1，自引：0，他引：1  

付广  臧凤智 《吉林大学学报(地球科学版)》2011,41(1):12-20

以透彻分析徐深大气田形成的具体原因为目的,通过徐深大气田源岩、圈闭、输导通道和盖层条件解剖及它们与气田分布之间关系分析,对徐深大气田的形成条件进行了详细研究.首先,对源岩的分布发育及地化特征进行研究,得出徐深大气田的源岩最主要为沙河子组煤系地层暗色泥岩,其为徐深大气田的形成提供充足的气源供给;其次,对徐深大气田圈闭条件...  相似文献