Mechanism of Secondary Pore Formation and Prediction of Favorable Reservoir of Paleogene in Jiyang Sag,Eastern China     

Lü Xixue 《中国地质大学学报(英文版)》2008,19(6):675-684

Jiyang (济阳) sag is an oil rich basin,consisting of Huimin (惠民),Dongying (东营),Zhanhua (沾化),and Chezhen (车镇) depressions.The elastic rock of Paleogene has undergone early and middle diagenetic stages and now the main clastic reservoir is in the middle diagenetic stage.Primary and secondary pores are developed in Paleogene sandstone,the latter is generated from the dissolution of feldspar and calcite cement in rocks owing to the organic acid from the maturated source rock,but the materials dissolved are different in different depressions.The reservoir secondary pores of Dongying depression are generated from the dissolution of calcite cement,the ones of Zhanhua and Huimin depressions from the dissolution of feldspar,the secondary pores of Chezhen depression from the dissolution of feldspar in upper section,and the dissolution of calcite cement in the lower section of Paleogene,respectively.The secondary pores are developed in two depths and the depth goes down from west to east,from south to north in Jiyang sag.The major controlling factors for secondary pore development are maturity and location of source rock.Lastly,the favorable reservoirs are evaluated according to reservoir buried depth,sedimentation,and diagenesis.The reservoir with high quality is located in the northern and central parts in Dongying depression; there are some good reservoirs in Gndao (孤岛),Gudong (孤东),and Gunan (孤南) areas in Zhanhua depression,and the favorable reservoirs are located in the north steep slope and the south gentle slope of Chezhen depression and central uplift,south gentle slope of Huimin depression.  相似文献   

康定杂岩Rb-Sr、Sm-Nd同位素系统及其意义   总被引：1，自引：0，他引：1  

陈岳龙  王忠  罗照华  李大鹏  赵俊香 《现代地质》2008,22(5)

通过对康定—冕宁地区出露的英云闪长岩、黑云角闪斜长片麻岩、角闪变粒岩全岩及其中所分离出的角闪石、黑云母、斜长石、钾长石的Rb-Sr、Sm-Nd同位素的系统测定,结合岩石的锆石U-Pb年龄结果,确定这些变质杂岩由于经历了复杂的形成过程与变质历史,Rb-Sr、Sm-Nd同位素体系难以确定其结晶年龄。由单矿物与全岩Rb-Sr、Sm-Nd体系拟合的~700 M a的等时线年龄反映了角闪岩相-高角闪岩相的变质作用年龄。Sm-Nd同位素体系由于在变质作用过程中的部分开放性,很容易给出无意义的较老的混合年龄。康定杂岩结晶后并没有经历麻粒岩相变质作用,区域上所含的麻粒岩透镜体可能是新元古代(773~721 M a)期间由Rod in ia超大陆裂解产生的新生洋壳向扬子克拉通陆块俯冲消减过程的变质产物。俯冲到一定深度后,由于板片被拉断,软流圈上涌导致变质洋壳板片岩石、先前底侵变质的镁铁质岩石及扬子陆块长英质基底岩石发生部分熔融,以镁铁质岩石熔融产生的熔浆为主(>70%),与长英质基底岩石熔融产生的熔浆混合形成w(Na2O)/w(K2O)>1的TTG组合。  相似文献   

Estimation of parameters in a split functional model of geodetic observations (M split estimation)     

Z. Wiśniewski 《Journal of Geodesy》2008,82(10):655-655

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地下水流模型识别的分步解法     

王晓明  王秀辉  郑重 《煤田地质与勘探》2008,36(5)

地下水流模型识别问题是综合的水文地质分析与计算过程,但常常被片面理解为反求水文地质参数问题,这种片面的认识大大妨碍了对水文地质条件的认识及对水文地质过程的理解,并由此导致一些不应有的错误结论。简要论述了地下水流模型识别的概念及问题类型,利用模型分解的方法指出地下水流模型的识别可分2步完成:一是利用附加水头场(或附加降深场)求参数;二是利用初始水头场确定边界条件及源汇项。除参数外,源汇项、初始条件、边界条件也是地下水流模型识别的重要内容。  相似文献   

内蒙古西部朱拉扎嘎金矿遥感蚀变异常与化探异常对比研究     

丛丽娟  岑况  黄增芳  冷福荣  刘金宝  王忠 《华南地质与矿产》2008,(1):29-35

本文以朱拉扎嘎金矿为例,应用遥感技术,对比分析朱拉扎嘎金矿遥感蚀变异常、化探异常的提取过程和分布特征,认为:1.遥感蚀变异常位于化探异常中心与矿体吻合关系好,可作为找矿标志,应用于化探异常筛选可增加其成矿有力度的判别;2.遥感蚀变异常定位精度高,异常范围小,更接近矿体,应用于化探异常查证可以提高查证效率.该方法技术适合于寻找与热液活动有关的金属矿产,在基岩出露好,植被稀少的干旱地区效果好,建议在我国西北部荒漠景观区开展应用遥感技术评价化探异常的找矿工作.  相似文献   

The Visual Model of Temporal Operation Information and Its Realization     

LUAN Xiao-yan  SUN Qun  GENG Zhong 《测绘科学技术学报》2008,25(6)

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High-resolution seismic analysis of the coastal Mecklenburg Bay (North German Basin): the pre-Alpine evolution     

H. Zöllner  K. Reicherter  P. Schikowsky 《International Journal of Earth Sciences》2008,97(5):1013-1027

The pre-Alpine structural and geological evolution in the northern part of the North German Basin have been revealed on the basis of a very dense reflection seismic profile grid. The study area is situated in the coastal Mecklenburg Bay (Germany), part of the southwestern Baltic Sea. From the central part of the North German Basin to the northern basin margin in the Grimmen High area a series of high-resolution maps show the evolution from the base Zechstein to the Lower Jurassic. We present a map of basement faults affecting the pre-Zechstein. The pre-Alpine structural evolution of the region has been determined from digital mapping of post-Permian key horizons traced on the processed seismic time sections. The geological evolution of the North German Basin can be separated into four distinct periods in the Rerik study area. During Late Permian and Early Triassic evaporites and clastics were deposited. Salt movement was initiated after the deposition of the Middle Triassic Muschelkalk. Salt pillows, which were previously unmapped in the study area, are responsible for the creation of smaller subsidence centers and angular unconformities in the Late Triassic Keuper, especially in the vicinity of the fault-bounded Grimmen High. In this area, partly Lower Jurassic sediments overlie the Keuper unconformably. The change from extension to compression in the regional stress field remobilized the salt, leading to a major unconformity marked at the base of the Late Cretaceous.  相似文献   

黄骅坳陷北大港构造带沙河街组沉积体系定量研究   总被引：2，自引：0，他引：2       下载免费PDF全文

吴林钢  朱筱敏  范乐元  钟大康 《古地理学报》2008,10(3):241-250

针对陆相湖盆沉积特征,以T A Cross高分辨率层序地层学理论为指导,在大量岩心、测井和地震资料研究的基础上,定量研究了黄骅坳陷北大港构造带沙河街组沉积体系和沉积物源特征,确定了沙河街组沉积时期总体发育近岸水下扇、滩坝、深水重力流水道、扇三角洲前缘和滑塌浊积扇等主要沉积相类型。中期基准面旋回A-D层序沉积时期发育近岸水下扇和扇三角洲前缘—前扇三角洲—滑塌浊积扇沉积体系;中期基准面旋回E-F层序沉积期间发育有利于油气储集的近岸水下扇和滩坝砂体;中期基准面旋回G层序沉积时期主要发育重力流主水道—重力流水道侧缘以及近岸水下扇沉积砂体;中期基准面旋回H层序沉积时期主要发育重力流主水道—重力流水道侧缘沉积体系。最后,预测了有利岩性圈闭发育的沉积相带和地区。  相似文献   

中国南方含油气区构造—沉积类型及其勘探潜力   总被引：1，自引：0，他引：1  

赵喆  钟宁宁  梁狄刚  陈建平 《海相油气地质》2008,13(1):51-54

南方含油气的复杂构造区根据构造—沉积类型的不同,可将其分为四种类型。通过对不同类型典型含油气区的生烃量及非构造运动天然气散失量的化学动力学计算,认为这四种类型含油气区的油气聚集潜力从好到坏依次为:喜马拉雅运动抬升暴露型、燕山运动抬升暴露型、反复抬升—沉降型和海西—印支运动抬升暴露—后期浅埋型。主要构造运动发生越晚,对油气保存越有利。  相似文献   

Assessment of cement’s dust impact on the soil using principal component analysis and GIS   总被引：2，自引：1，他引：1  

Z. Zerrouqi  M. Sbaa Ph.D.  M. Oujidi Ph.D.  M. Elkharmouz  S. Bengamra  A. Zerrouqi 《International Journal of Environmental Science and Technology》2008,5(1):125-134

To evaluate the impact of the cement’s dust emitted by the eastern Moroccan cement factory (Oujda Holcim) and deposited on the soil of the Ain Lahjar commune, 58 samples of soil were collected around the factory on a radius of 3 km approximately. The physicochemical analyses of the upper 3 cm of the soil surface samples correspond to the pH, electrical conductivity, the chlorides and the oxides of Ca, Al, Fe, K, Mn, S and Si which were analyzed by the fluorescence of X-rays. The preliminary results demonstrate that this dust are especially basic and contain a high free lime (43% CaO). The principal component analysis (applied on the 58 samples of soil) allows deducting that the free lime and the sulfur oxide are the tracer elements of this form of pollution. Furthermore, the spatial projection of the factor scores of the principal component analysis using the geographical information system permits to determine the spatial distribution of more polluted areas of soils as well as to estimate their surface (63.3% of the survey zone).  相似文献