Origin, Flow of Formation Water and Hydrocarbon Accumulation in the Zhenwu Area of the North Jiangsu Basin, China     

LI Mei  LOU Zhanghu  JIN Aimin  ZHU Rong  SHANG Changjian  YE Ying  ZHU Zhenhong 《《地质学报》英文版》2013,87(3):819-829

In order to understand the origin and flow of formation water and to evaluate the hydrocarbon accumulation and preservation conditions, the properties of formation water chemistry and dynamics of the Zhenwu area in the southern Gaoyou Sag, North Jiangsu Basin, China, have been investigated. The results show that Xuzhuang oilfield is infiltrated discontinuously by meteoric water under gravity, which consequently leads to the desalination of formation water. Formation water in the Zhenwu and Caozhuang oilfields is less influenced by meteoric water infiltration, and the origin is interpreted to be connate water. Hydrocarbon migration, accumulation and preservation are closely related to the hydrodynamic field of formation water. Formation water concentrates gradually during the process of centrifugal flow released by mudstone compaction and the centripetal flow of meteoric water infiltration, leading to the high salinity of the central part. The geological conditions of the southern fault-terrace belt are poor for hydrocarbon accumulation and preservation as meteoric water infiltration, leaching and oxidation, while the central part, i.e., northern Zhenwu and Caozhuang oilfields is beneficial for an abundance of hydrocarbon accumulation. Most of the large scale oil-gas fields locate herein.  相似文献   

利用长江口现代潮滩沉积硅藻建立海平面转换函数的尝试   总被引：1，自引：0，他引：1       下载免费PDF全文

庄陈程  战庆  王张华 《古地理学报》2014,16(4):557-568

在高精度海平面定量重建研究中,有孔虫、硅藻等海洋微体古生物转换函数技术是近10余年随着计算机技术发展而快速兴起的一项新技术,已成为欧美地区研究海平面变化的不可或缺的定量手段之一,而其在中国沿海地区全新世海平面定量重建中的应用却屈指可数。以硅藻为例,详细介绍了建立其与海平面之间的转换函数的过程,包括现代表层样采集、统计学分析、误差的可能来源和减小误差的方法。通过在对崇明岛四滧港SY剖面潮滩表层样品的环境因子分析和对硅藻属种的CCA排序分析发现,高程对潮滩硅藻属种排序有着很高的解释贡献。随后通过WA和WA-PLS建立模型,四滧港SY剖面全样WA-PLS模型的相关系数(R²_Jack)达到0.9004,预期误差(RMSEP)为12.622,若不考虑潮上带样品SY1后的转换模型其精度更能达到±10cm。本研究以期带动此项技术在国内的发展,促进高精度海平面定量重建,从而能为沿海地区海岸带管理提供更详实、更具现实指导意义的地质记录。  相似文献   

姚江-宁波平原中全新世海侵事件及古人类活动的快速响应     

唐亮  吕晔  年小美  雷少  王张华 《第四纪研究》2019,(5):1116-1132

姚江-宁波平原是新石器河姆渡文化核心分布区,大量考古与古环境研究成果为深入探讨本地区7000年来的人地关系,尤其是新石器遗址文化间歇事件的原因创造了有利条件。本文通过对鱼山遗址地层记录的详细研究以及与区域多个遗址地层的空间对比,并对照该区自河姆渡文化一期以来古人类遗址的时空迁移过程,总结新石器文化演进中的海侵事件,并分析其与文化间歇的内在联系,初步认识如下:1)鱼山遗址从山麓到平原,地层记录存在明显差别,因此需要在不同的古地理位置获取剖面进行对比,才能重建更完整的古环境演变过程。2)鱼山遗址记录了2次海水入侵事件,分别发生于6300~6000cal.aB.P.和4500~3400cal.aB.P.,这两次事件与区内其他遗址文化层堆积中普遍叠压的自然淤积层或文化层缺失现象具有良好对应关系;研究区另有部分遗址在5400~5300cal.aB.P.也存在海水入侵迹象。3)新石器遗址时空分布呈现阶段性变化,河姆渡文化一、二期,遗址数量少,增幅小,主要分布于山麓缓坡地带,反映海水入侵造成研究区土地资源的局限性。河姆渡文化三、四期的遗址数量显著增加,且向开阔平原地带扩散,表明较稳定的海平面使研究区平原成陆面积增大,古人类对海岸带的利用快速扩张。良渚末期,遗址大幅度减少,直至商周才重新增多,反映持续的海水入侵制约古人类活动强度。上述遗址时空迁移特征反映海岸带古人类活动对环境变化的快速响应。  相似文献   

长江三角洲地层中的冷杉和云杉花粉的来源推测   总被引：6，自引：5，他引：1       下载免费PDF全文

陈静  王张华  李晓  陈中原 《第四纪研究》2009,29(2):290-298

孢粉通常被用作古气候的代用指标,长江三角洲地区已经进行了许多相关的孢粉-古气候的研究工作。通过对长江三角洲地区7个晚更新世钻孔的孢粉资料进行提取对比,发现冷杉和云杉两种花粉在地层中分布有一定的规律性。现代长江流域这两种耐寒植物集中分布在青藏高原区,长江中下游地区极少分布,但其花粉确出现在近河口区的晚更新世以来的暖期地层中（MIS1,3和5期）,并且达到了一定数量,这很可能是长江从其上游地区搬运至此沉积下来的。同时,我们也发现西部内陆平原区由于受长江物源影响较少,其晚更新世以来地层中的冷杉和云杉花粉分布与河口区差别很大,这也为河流携带冷杉和云杉花粉至河口地区提供了证据。这一发现如果成立,冷杉和云杉花粉即可作为长江物源的一个判别指标。  相似文献   

现代长江口的形成及末次冰消期以来沉积环境演变   总被引：1，自引：0，他引：1  

张丹  王张华  李卫康  李晓 《海洋地质与第四纪地质》2010,(2)

利用在长江口崇明岛获得的一个第四纪钻孔,对中更新世末以来的沉积物进行了OSL、14C测年,在此基础上进行岩性、微体古生物和孢粉分析,以探讨现代长江口形成的基础以及末次冰消期以来在气候-海平面波动控制下河口沉积环境的演变。研究结果显示,本孔所在地中更新世末处于湖沼环境,但晚更新世一直以河流环境为主,且主要发育末次冰期的河道滞留相沉积。在此基础上,随着末次冰消期海平面的上升,先后发育了河口湾和三角洲沉积体系。末次冰消期的海平面快速上升在本孔沉积物记录中体现为微体古生物化石较丰富,潮流作用显著。全新世早期长江口堆积速率明显高于全新世中晚期,应当反映了温暖湿润的季风气候条件下入海泥沙非常丰富。  相似文献   

太湖平原碟形洼地沉积物记录的距今8 000年以来植被、气候与地貌演变   总被引：1，自引：1，他引：0  

赵宝成  王张华  陈中原  吴国瑄 《古地理学报》2007,9(3):321-330

利用DGY孔沉积物的岩性、粒度及孢粉分析资料,探讨了太湖平原碟形洼地沉积物记录的8 000年以来植被演化、气候波动,流域地貌环境的演变及其对海平面波动的响应。孢粉记录表明：本区距今8 000～5 000年木本植被由以落叶阔叶乔木和针叶乔木为主变为落叶阔叶乔木和常绿阔叶乔木为主,气候由温和略干转为暖热湿润;距今5 000～4 000年森林退缩,气候温和偏干;距今4 000年左右出现低温事件;距今4000～3000年木本植被以常绿阔叶乔木为主,气候温暖湿润;距今3 000年以来木本植被主要为常绿阔叶乔木、落叶阔叶乔木和针叶乔木,气候总体温暖湿润,有波动变凉干趋势。岩性、粒度及孢粉记录综合显示本区距今8 000～5 000年发育潟湖相泥质粉砂,反映流域环境开放、与海连通;距今5 000～4 000年发育淡水沼泽,未受海水作用,反映水域缩小、流域环境封闭;距今4 000～3 000年水域扩大,并出现海水倒灌,反映内低外高的碟形洼地已经形成;距今3 000年以来,发育湖沼平原,发生数次海水倒灌,反映碟形洼地地貌的进一步发育。  相似文献   

Seismic performance of precast bridge columns connected with grouted corrugated-metal duct through biaxial quasi-static experiment and modeling     

Xia Zhanghua  Lin Shangshun  He Yongbo  Ge Jiping  Sun Jinlei 《地震工程与工程振动(英文版)》2021,20(3):742-765

In this paper, the seismic behaviors of precast bridge columns connected with grouted corrugated-metal duct(GCMD) were investigated through the biaxial quasi-static experiment and numerical simulation. With a geometric scale ratio of 1:5, five specimens were fabricated, including four precast bridge columns connected with GCMD and one cast-in-place(CIP) bridge column. A finite element analysis model was also established by using Open Sees and was then calibrated by using the experimental results for parameter analysis. The results show the biaxial seismic performance of the precast bridge columns connected with GCMD was similar to the CIP bridge columns regarding ultimate bearing capacity and hysteresis energy, and further, that it could meet the design goal of equivalent performance. The seismic performance of the precast bridge columns connected with GCMD deteriorated more significantly under bi-directional load than under uni-directional load. A proper slenderness ratio(e.g., 7.0–10.0) and longitudinal reinforcement ratio could significantly improve the energy dissipation capacity and deformation capacity of the precast bridge columns, while the axial load ratio and concrete strength had little influence on the above properties. The research results could bring insights to the development of the seismic design of precast bridge columns connected with GCMD.  相似文献   

松辽盆地储层成岩反应与孔隙流体地球化学性质及成因   总被引：14，自引：3，他引：11  

楼章华 《地质学报》1998,72(2):144-152

松辽盆地储层的砂岩类型为典型的不稳定砂岩,岩屑、长石等不稳定组分的含量较大。长石的钠长石化作用和长石、岩屑的水化水解作用、溶解作用、导致了不稳定组分的转变以及大量离子游离于孔隙水中,同时导致大量的自生矿物沉淀。因此,在沉积物沉积埋藏过程中,孔隙水与矿物之间发生了一系列物理和化学变化,通过水－岩之间的离子交换改变了孔隙不中的离子组合。在砂碉成岩过程中,各种成岩反应随着沉积物的埋藏压实具有不同程度的阶  相似文献   

Anomalous current recorded at lower low water off the Changjiang River mouth,China     

Zhanghua?WangEmail author  Zhongyuan?Chen  Kazumaro?Okamura  Jianhua?Gao  Kaiqin?Xu  Hiroshi?Koshikawa  Masataka?Watanabe 《Geo-Marine Letters》2004,24(4):252-258

A hydrographic-sedimentological investigation was conducted in May 2001, aimed at assessing dynamic sedimentation patterns near and off the Changjiang River mouth, East China Sea. Current speed/direction, suspended sediment concentration (SSC), and turbidity were measured at eight nearshore and offshore sites, spanning a distance of ca. 150 km. The results identified a high-speed current ranging from 0.9 to 1.6 m/s at lower low water in the front of the turbidity maximum zone. This anomalous current, lasting about 4 h, was the fastest recorded over two semi-diurnal tidal cycles. Simultaneous measurements showed a high SSC (0.5 g/l) and high turbidity (>230 ppm) near the seafloor. This phenomenon would help explain periodic enhancement of sediment resuspension in the area, and an associated southward transport route from the Changjiang River mouth.  相似文献   

Holocene depocenter shift in the middle-lower Changjiang River basins and coastal area in response to sea level change     

Zhanghua WANG  Jingpu LIU  Baocheng ZHAO 《Frontiers of Earth Science》2008,2(1):17-26

Authors collected 38 sedimentary boreholes and numerous seismic profiles from previous publications to delineate the Holocene sedimentation rate of six major depositional sinks in the middle-lower Changjiang River basins and its river coast. The results demonstrate that the highest sedimentation rate of ca. 15 m/ka occurred in the mono-depositional sink of the former Changjiang River mouth during 10 000–8000 aBP, when post-glacial transgression happened and the Changjiang water level remained at lower stand. With the rising of the Changjiang water level in response to sea level rise, Jianghan Basin of the middle Changjiang River becomes the other important depositional sink with highest sedimentation rate of 10 m/ka since 7000 aBP. As Jianghan Basin was mostly filled up at ca. 4000 aBP, Dongting Basin and the lower Changjiang valley trapped sediments in great amounts like in the river mouth. A considerable amount of Changjiang sediments has been delivered, both eastward and southward, to the inner continental shelf of the East China Sea, especially after 2000 aBP. This indicates reduced sediment storage capacity of the middle-lower Changjiang valley and the river mouth. In total, ca. 1307.4 billion tons of sediment have deposited in the middle-lower Changjiang floodplain since 7000 aBP. In the meantime, ca. 947 billion tons of sediment have been deposited in the river coast to form the Changjiang subaqueous delta and the Zhejiang-Fujian along-shelf mud wedge. Our result also reveals two time stages with lower sedimentation rates(< 4 m/ka) in all basins during 8000–7000 aBP and in the estuarine area during 4000–2000 aBP, probably owing to stengthened chemical weathering of decline of monsoon precipitation. __________ Translated from Journal of Palaeogeography, 2007, 9(4):419–429 [译自: 古地理学报]  相似文献