Divergence and flow direction as indicators of subsurface heterogeneity and stage‐dependent storage in alluvial floodplains          下载免费PDF全文

D. M. Heeren  G. A. Fox  A. K. Fox  D. E. Storm  R. B. Miller  A. R. Mittelstet 《水文研究》2014,28(3):1307-1317

Assuming homogeneity in alluvial aquifers is convenient, but limits our ability to accurately predict stream‐aquifer interactions. Research is needed on (i) identifying the presence of focused, as opposed to diffuse, groundwater discharge/recharge to streams and (ii) the magnitude and role of large‐scale bank and transient storage in alluvial floodplains relative to changes in stream stage. The objective of this research was to document and quantify the effect of stage‐dependent aquifer heterogeneity and bank storage relative to changes in stream stage using groundwater flow divergence and direction. Monitoring was performed in alluvial floodplains adjacent to the Barren Fork Creek and Honey Creek in northeastern Oklahoma. Based on results from subsurface electrical resistivity mapping, observation wells were installed in high and low electrical resistivity subsoils. Water levels in the wells were recorded real time using pressure transducers (August to October 2009). Divergence was used to quantify heterogeneity (i.e. variation in hydraulic conductivity, porosity, and/or aquifer thickness), and flow direction was used to assess the potential for large‐scale (100 m) bank or transient storage. Areas of localized heterogeneity appeared to act as divergence zones allowing stream water to quickly enter the groundwater system, or as flow convergence zones draining a large groundwater area. Maximum divergence or convergence occurred with maximum rates of change in flow rates or stream stage. Flow directions in the groundwater changed considerably between base and high flows, suggesting that the floodplains acted as large‐scale bank storage zones, rapidly storing and releasing water during passage of a storm hydrograph. During storm events at both sites, the average groundwater direction changed by at least 90° from the average groundwater direction during baseflow. Aquifer heterogeneity in floodplains yields hyporheic flows that are more responsive and spatially and temporally complex than would be expected compared to more common assumptions of homogeneity. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

SEISMIC GEOLOGY     

《Abstract of Chinese Geological Literature》2014,(4)

正20141967An Zhanghui(Lanzhou Base of Institute of Earthquake Prediction,CEA,Lanzhou 730000,China);Du Xuebin Study onthe Geo-Electric Field Variation of Sichuan Lushan MS7.0and Wenchuan MS8.0Earthquake(Chinese Journal of Geophysics,ISSN0001-5733,CN11-2074/P,56(11),  相似文献   

GEOPHYSICAL EXPLORATION     

《Abstract of Chinese Geological Literature》2014,(2)

正20141074Bao Xijie(Research Institute of Exploration and Development,Daqing Oilfield Company,PetroChina,Daqing 163712,China)Gather Optimal Processing and Application Effect of Prestack AVA Instantaneous Inversion  相似文献   

HYDROGEOLOGY & ENGINEERING GEOLOGY     

《Abstract of Chinese Geological Literature》2014,(4)

正1.HYDROGEOLOGY20142452Chang Chengcao(Institute of Coalfield Geological Survey and Design of Jilin Province,Changchun 130062,China)Hydrogeological Type Division of Coal Mine No.2Mine in Yitong Manchu Autonomous County,Jilin Province(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.129-131,3refs.)  相似文献   

ECONOMIC GEOLOGY     

《Abstract of Chinese Geological Literature》2014,(4)

正20142114Lin Quansheng(China University of Geosciences,Bejing 100083,China)On the Geologic Characteristics and Economic Significance of the Cambrian Lintian Group in Fujian Province(Geology of Fujian,ISSN1001-3970,CN35-1080/P,32(4),2013,p.264-273,2illus.,2tables,6refs.)  相似文献   

PETROLEUM GEOLOGY     

《Abstract of Chinese Geological Literature》2014,(2)

正20140890 Bai Ru(National Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China);Zhang Jingong Characteristics of Pore Character and Its Controls of Chang 6Reservoir of Zhiluo Oilfield(Journal of Northwest University,ISSN1000-274X,CN61-1072/N,  相似文献   

GEOTHERMICS GEOLOGY     

《Abstract of Chinese Geological Literature》2014,(3)

正20141588 Guo Shiyan(Green Energy Geothermai Development Co.,SINOPEC,Xianyang 712000,China);Li Xiaojun Reservoir Stratum Characteristics and Geothermal Resources Potential of Rongcheng Uplift Geothermal Field in Baoding,Hebei Province(Chinese Journal of Geology,ISSN0563-5020,CN11-1937/P,48(3),2013,p.922-931,2 illus.,4 tables,10 refs.)Key words:geothermal fields,Hebei Province  相似文献   

黄骅坳陷古生界潜山储层沥青成因判识     

王鑫  周立宏  金凤鸣  付立新  楼达 《地质论评》2021,67(Z1):67z1123-67z1124

正黄骅坳陷古生界潜山是大港油田重要的油气勘探领域,近年来,先后在王官屯、乌马营潜山古生界发现油气流,且均为石炭—二叠系煤系源岩供烃成藏,如王官屯潜山王古1井二叠系石盒子组发现天然气,同位素特征判断为煤成天然气。这些发现拓展了古生界潜山的勘探领域,表明了石炭—二叠系煤系烃源岩的油气充注范围不仅仅局限于奥陶系碳酸盐岩储层,石炭—二叠系的碎屑岩储层也可以充注成藏,证实了古生界潜山具有更大的油气勘探价值。随着勘探进程与理论认识的不断深化,  相似文献   

渤海湾盆地南堡凹陷南部深层沙一段优质碎屑岩储层特征及成因机制     

赵晓东  时阳  文雯  李亮  张博明  陈刚强 《地质论评》2021,67(3):67040015-67040015

利用岩芯、薄片、扫描电镜和分析化验等资料,对南堡凹陷南部深层古近系沙一段（沙河街组一段）优质碎屑岩储层特征进行了分析并揭示其成因机制。研究表明：①南堡凹陷南部沙一段优质碎屑岩储层属于低孔中渗储层,发育原生孔隙、次生孔隙和微裂缝;②沙一段沉积期处于强水动力沉积环境,辫状河三角洲前缘水下分流河道砂体普遍发育,岩性主要为中粗砂岩、含砾砂岩和砂砾岩等粗岩性,岩石类型主要为岩屑长石砂岩,石英、岩浆岩岩屑等刚性组分含量高,储层在强压实作用下仍保留了局部原生残余粒间孔,部分刚性组分强压条件下形成微裂缝;③沙一段与东三段为区域不整合接触,大气水的酸性流体在成岩初期以及烃源岩成熟之后产生的有机酸在成岩后期通过油源断裂和不整合面进入储层,造成长石、易溶碎屑等组分溶蚀形成次生孔隙,溶蚀作用不仅增加孔隙空间,而且扩大喉道宽度。结论认为：粗岩性和高刚性颗粒含量为原生孔隙的保存提供了物质基础;油源断层、不整合面为酸性流体的进入提供路径,促进了次生孔隙发育。  相似文献   

基于恒速压汞技术研究页岩气储层孔隙结构:以湘西北地区五峰组页岩为例     

王静 《地质与勘探》2021,57(2):450-456

页岩气储层孔隙结构是页岩气富集成藏、储层评价和优选有利区的关键参数,区分孔隙和喉道是表征页岩气储层孔隙结构的关键。本文选择4块具有不同渗透率的湘西北地区奥陶系五峰组页岩为研究对象,基于恒速压汞实验讨论孔隙和喉道的大小、分布特征及其相互关系以及与渗透率的联系。结果表明:具有不同渗透率的页岩样品表现为较为相近的孔径分布特征但差异较大的喉道分布特征。页岩样品渗透率的大小与孔隙半径没有明显相关关系;喉道大小及其分布特征是控制低渗储层孔隙结构的关键要素之一。渗透率较低页岩样品的喉道以喉道半径小且集中分布为特征,而渗透率较大页岩样品的喉道以喉道半径大呈分散分布但主要以大喉道为特征。喉道特征是研究页岩气储层储集空间和吸附能力的重要部分,在以后对页岩气的勘探开发中应特别注意及重视。  相似文献