姬塬地区低渗砂岩储层微观非均质性表征     

吴小斌  侯加根  田小洁  孙卫 《新疆地质》2011,29(3):311-313

为表征鄂尔多斯盆地低渗储层的微观非均质性,采用铸体薄片、扫描电镜、压汞等测试手段,研究姬塬地区低渗砂岩储层微观非均质性特征及影响因素,并结合多参数模糊聚类分析,将储层微观非均质性划分为较弱、中等和较强3类.通过真实砂岩模型水驱油实验,刻画了3类不同非均质程度模型的流体运动及水驱前缘形态的差异性.室内测试分析研究、地质学定量统计分类及真实砂岩模型水驱油实验相结合的综合研究方法,真实反映低渗储层微观非均质性,对同类储层研究具借鉴意义.  相似文献   

HS-Ⅱ型岩土层含水量自动监测仪的研究与应用     

刘一民  周策  陈文俊 《地质灾害与环境保护》2011,22(2):103-106

为监测岩土层含水量的变化,预警地质灾害,中国地质科学院探矿工艺研究所研制了HS-Ⅱ型自动监测仪.本文介绍监测仪的电容式水分传感技术、构成、原理和施工方法及其应用实验.监测仪对实验区进行的多点分层测试表明,该仪器监测数据可靠,工作正常,符合自动化和实时化的监测技术要求.  相似文献   

天然气水合物钻井泥浆冷却系统的设计及现场应用   总被引：3，自引：1，他引：2       下载免费PDF全文

李国圣  孙友宏  郭威 《探矿工程》2011,38(2):8-11

从天然气水合物赋存的温压条件入手,说明了制冷泥浆的重要性。介绍了天然气水合物钻井泥浆冷却系统的结构组成、工作原理及设计过程。进而阐述了该套系统在中国冻土区天然气水合物科学钻探施工中的应用情况。试验证明：该套系统完全达到了设计要求,并首次成功地在青藏高原木里盆地永冻区钻获天然气水合物样品。  相似文献   

强震作用下山体崩塌破坏有限元分析     

王来贵  刘学  李磊  黄润秋 《中国地质灾害与防治学报》2011,22(1):27-31

基于汶川大地震下,山体边坡发生大规模塌滑等地质灾害的现状,为了深入研究山体在强震动力作用下进入非线性状态并开裂破坏的力学机理,通过理论研究从拉张破裂的角度对山体崩塌机制进行分析,并给出拉张判据。用有限元开发程序对山体边坡在强震动力作用下拉张破坏进行数值模拟,并与振动平台相似材料实验下的监测结果对比分析。表明,强震荷载激励下,岩石第一主（拉）应力极易达到其抗拉强度,则岩体优先发生拉张破裂。在强震动力作用过程中,拉张破裂不断积累,即在松动区的松散程度和松散范围不断增大,形成山体塌滑趋势。揭示了山体边坡从连续介质状态开始崩塌破裂的发生机制,为后续进行复杂的山体破坏力学研究提供依据。  相似文献   

CO2流体-长石相互作用实验研究   总被引：1，自引：0，他引：1  

朱焕来  曲希玉  刘立  于志超  张立东  唐辉 《吉林大学学报(地球科学版)》2011,41(3):697-706

不同温度下(100、200、300℃)CO2流体与富钾长石和斜长石的水热实验表明:随着温度的升高,长石的溶蚀强度逐渐加大,且钠长石的溶蚀程度强于钾长石。在CO2流体与富钾长石及斜长石反应后,200℃和300℃时样品表面均有球粒状、棒状及花状的水铝矿生成,且200℃时样品表面有菱铁矿生成;在CO2流体与斜长石反应后,300℃时样品表面有球形的氧化亚铁析出。这表明CO2能够以碳酸盐的形式在矿物中"固定",其被"固定"的上限温度为200℃左右。  相似文献   

差异升降运动的物理模拟及其对黄珏南地区构造解释     

王彤达  戴俊生  张继标  张振  陈红磊  商琳 《华北地质》2011,34(4):268-273

为研究黄珏南地区阜宁组断裂平面组合及发育顺序,针对断阶带设计了两个系列的物理模拟实验模型。从不同湿度的沙、黏土、沙泥混合物中优选出干黏土作为实验材料,详细记录了实验过程,并做出相应的地质解释。实验结果表明：黄珏南地区阜宁早期在拉张力的作用下形成了东西向的断层,构成了断阶带的基本构造格架,阜宁晚期在拉张力和差异升降运动的...  相似文献   

煤样自燃性升温程序实验研究     

景兴鹏 《中国煤炭地质》2011,(4):11-13,22

以铜川煤矿煤样为测试样品,利用自主研发的煤层自燃性升温的实验系统,对煤层的自燃过程进行实验模拟。根据实验测试数据对煤温与供气量以及实验过程的指标气体情况进行分析,得出煤层自燃性的临界温度、干裂温度等各个自燃特性。实验结果对煤矿分析和预测煤层自燃的过程具有指导意义。  相似文献   

Variability of wave-induced ripple migration in wave-flume experiments and its implications for sediment transport   总被引：1，自引：0，他引：1  

Naofumi Yamaguchi  Hideo Sekiguchi 《Coastal Engineering》2011

A thorough discussion of results from laboratory experiments with regular waves sheds light on the gap that lies between the sediment transport associated with ripple migration and the performance of a standard bedload transport formula in terms of bed shear concept. It is found that the extent of deviations of the bedload transport formula by Ribberink (1998) from the measured rate of sediment transport associated with ripple migration becomes systematically apparent under conditions of increasing settling time factor Ω_s (= η/(w₀T); η is the ripple height, w₀ the settling velocity and T the wave period). Re-examination of previous two field studies demonstrates a further reinforcement for phase-lag argument addressed in this paper.  相似文献   

Bacterioplankton responses to iron enrichment during the SAGE experiment     

J. Kuparinen  J. HallM. Ellwood  K. SafiJ. Peloquin  D. Katz 《Deep Sea Research Part II: Topical Studies in Oceanography》2011,58(6):800-807

We studied the microbial food web in the upper 100 m of the water column in iron-limited sub-Antarctic HNLC waters south-east of New Zealand in the SAGE experiment in 2004, with focus on bacterioplankton. Samples were collected daily from inside and outside the iron enriched patch. Short term enrichment experiments were conducted on board in 4 L polycarbonate bottles with water outside the iron enriched patch to study single and combined effects of micronutrient additions on microbial food web. Low bacterial growth was recorded in the study area with community turnover times of 50 h or more during the study period. Measurements of bacterial standing stocks and production rates in the study show minor responses to the large scale iron enrichment, with increase in rates and stocks after the first enrichment and at the end of the study period after the third iron enrichment when solar radiation increased and wind mixing decreased. The average daily bacterial production rates were 31.5 and 33.7 mgCm⁻² d⁻¹ for the OUT and IN stations, respectively; thus overall there was not a significant difference between the control and the iron-enriched patch. In the bottle experiments bacterial thymidine incorporation showed responses to single iron and silicic acid enrichments and a major growth response to the combined iron and sucrose enrichments. Phytoplankton chlorophyll-a showed clear stimulation by single additions of iron and silicic acid and silicic acid enhanced the iron impact. Cobalt additions had no effect on bacteria growth and a negative effect on phytoplankton growth. Low bacterial in situ growth rates and the enrichment experiments suggest that bacteria are co-limited by iron and carbon, and that bacterial iron uptake is dependent on carbon supply by the food web. With the high iron quota (??mol Fe mol C⁻¹) bacteria may scavenge considerable amounts of the excess iron, and thus influence the relative importance of the microbial food web as a carbon sink.  相似文献   

The response of phytoplankton to iron enrichment in Sub-Antarctic HNLCLSi waters: Results from the SAGE experiment     

Jill Peloquin  Julie HallKarl Safi  Walker O. Smith Jr.Simon Wright  Rick van den Enden 《Deep Sea Research Part II: Topical Studies in Oceanography》2011,58(6):808-823

Areas of high nutrients and low chlorophyll a comprise nearly a third of the world’s oceans, including the equatorial Pacific, the Southern Ocean and the Sub-Arctic Pacific. The SOLAS Sea-Air Gas Exchange (SAGE) experiment was conducted in late summer, 2004, off the east coast of the South Island of New Zealand. The objective was to assess the response of phytoplankton in waters with low iron and silicic acid concentrations to iron enrichment. We monitored the quantum yield of photochemistry (F_v/F_m) with pulse amplitude modulated fluorometry, chlorophyll a, primary productivity, and taxonomic composition. Measurements of F_v/F_m indicated that the phytoplankton within the amended patch were relieved from iron stress (F_v/F_m approached 0.65). Although there was no significant difference between IN and OUT stations at points during the experiment, the eventual enhancement in chlorophyll a and primary productivity was twofold by the end of the 15-day patch occupation. However, no change in particulate carbon or nitrogen pools was detected. Enhancement in primary productivity and chlorophyll a were approximately equal for all phytoplankton size classes, resulting in a stable phytoplankton size distribution. Initial seed stocks of diatoms were extremely low, <1% of the assemblage based on HPLC pigment analysis, and did not respond to iron enrichment. The most dominant groups before and after iron enrichment were type 8 haptophytes and prasinophytes that were associated with ∼75% of chlorophyll a. Twofold enhancement of biomass estimated by flow cytometry was detected only in eukaryotic picoplankton, likely prasinophytes, type 8 haptophytes and/or pelagophytes. These results suggest that factors other than iron, such as silicic acid, light or physical disturbance limited the phytoplankton assemblage during the SAGE experiment. Furthermore, these results suggest that additional iron supply to the Sub-Antarctic under similar seasonal conditions and seed stock will most likely favor phytoplankton <2 ??m. This implies that any iron-mediated gain of fixed carbon will most likely be remineralized in shallow water rather than sink and be sequestered in the deep ocean.  相似文献