Molecular Geochemical Evidence for the Origin of Natural Gas from Dissolved Hydrocarbon in Ordovician Formation Waters in Central Ordos Basin   总被引：1，自引：0，他引：1  

李贤庆  侯读杰  唐友军  胡国艺  熊波 《中国地球化学学报》2003,22(3):193-202

1IntroductionTheOrdosBasinisthesecondlargestoilandgas bearingbasininChina .ItislocatedinthePaleo zoicplatformandbelongstoacratonbasin ,whichisincongruencewiththePaleozoicdepressionattheedgesoftheplatformandtheMesozoic Cenozoicdepressionwithintheplatform .SincethediscoveryofnaturalgasesinWellShancan 1andWellYu 3in 1989,theassessmentandexplorationofOrdovicianweatheringcrustnaturalgasesintheOrdosBasinhaveattractedextensiveatten tion (YangJunjieetal.,1996 ;DaiJinxingetal.,1997) .Thecentral…  相似文献   

江汉盆地王北区块盐湖沉积和微相特征     

李美静  李建明 《四川地质学报》2008,28(3):184-185

位于江汉盆地潜江凹陷王场盐隆背斜构造西北倾末端的王北区块具有典型的盐湖沉积。通过对王场油田北区盐湖沉积机理和沉积规律的研究,弄清了它的各个微相特征,这对王场油田北区的后续滚动勘探开发具有很大的指导意义。  相似文献   

基于GIS的数字校园系统的设计   总被引：3，自引：0，他引：3  

许晓宏 《地理空间信息》2008,6(1):62-64

在分析数字校园系统建设的软、硬件背景的基础上,基于学校统一管理的高效性以及适应当前信息时代发展的需求,在深入调查了解各种用户的潜在需求的基础上,提出了数字校园系统的建设方案,并以长江大学为例来进一步展示说明数字校园系统建设的必要性与可行性。  相似文献   

GIS辅助下的岩相古地理重建   总被引：6，自引：0，他引：6  

李少华  陈玉琨  毛平  周健 《地理空间信息》2008,6(5):25-27

阐述了采用单因素分析多因素作图法和GIS的空间分析功能实现岩相古地理重建的方法。单因素是能独立地反映某地区、某地质时期、某沉积层段沉积环境某些特征的因素,如厚度、岩石类型、矿物成分等。单因素分析多因素作图是在单因素分析的基础上,把这些单因素图叠加起来,并结合其他资料进行综合分析,作出定量的岩相古地理图。在GIS平台基础上,采用单因素分析多因素作图法可以快速、准确地实现某一地区的岩相古地理重建。  相似文献   

Geochemical characteristics and genetic types of crude oils from the Tertiary system in the southern part of western Qaidam Basin, Northwest China   总被引：3，自引：3，他引：0  

Hongbo Li  Min Zhang  Chunming Zhang  Dehua Peng 《中国地球化学学报》2008,27(3):285-290

Crude oil samples taken from the southern part of western Qaidam Basin were analyzed with GC/MS in order to understand the geochemical characteristics of crude oils. The results reveal that most crude oils are characterized by high abundance of gammacerane and C35 homohopane, which are the representative characteristics of saline lacustrine crude oils. Based on the variation of the ratios of gammacerane/C30 hopane （G/H） and C35 homoho-pane/C34 homohopane （C35/C34H）, two crude oil groups, A and B, are identified. Group-A crude oils mainly occurr in the north of the study area, with higher ratios of G/H （〉0.8） and C35/C34H （〉1.2）, whereas group-B crude oils, selected from the south of the study area, show lower ratios of G/H （〈0.8） and C35/C34H （〈1.0）. In addition, group-A crude oils are distinguished into three subgroups in accordance with their different ratios of G/H and C35/C34H and different distribution characteristics of n-alkanes, isoprenoids and steranes. These may be helpful for understanding the distribution characteristics of crude oils in the southern part of western Qaidam Basin and providing clues to the forthcoming exploration of crude oils and gas.  相似文献   

干旱气候条件下陆相高分辨层序地层特征研究——以江汉盆地西南缘晚白垩世渔洋组为例   总被引：3，自引：2，他引：3  

陈波  张昌民  韩定坤  赵海涛  赖志云 《沉积学报》2007,25(1):21-28

江汉盆地西南缘白垩系上统渔洋组地层旋回主要受气候因素的影响。研究区渔洋组是在干旱气候条件下沉积的洪水—漫湖沉积体系，其气候变化的特点是短暂洪水期与较长干旱的间洪水期交替变化，同时表现出不同级别的旋回，在气候越来越干旱的背景下，洪水期持续的时间就会越短，洪水的规模也越来越小。在短期的气候变化旋回下，地层沉积特征表现为洪水期沉积的水道、砂坪等微相与干旱的间洪水期泥坪微相互层。在中期气候变化旋回下，主洪水期持续时间长、规模大，沉积分布广泛,形成较厚的灰色水道砂岩沉积和灰色泥岩沉积夹薄层的红色泥坪沉积，间洪水期沉积为砂坪、混合坪与泥坪互层构成。长期旋回表现为每个中期主洪水期越来越小、水道沉积规模变小，间洪水期形成的红色泥坪厚度逐渐加厚，代表气候越来越干旱。研究区的这种地层旋回变化特征反映出气候是地层旋回的主控因素，不仅控制地层的短期旋回，同时控制地层的中长期旋回。这些特征具明显的等时性和可对比性，为油田开发过程中小层对比及油层划分提供了理论依据。  相似文献   

双河油田储层地质模型研究   总被引：2，自引：0，他引：2  

李少华  许月明  张尚锋  刘德华 《沉积与特提斯地质》2007,27(3):108-112

在建立双河油田高精度的三维地质模型中,首先进行了基础地质研究,主要包括岩石相的识别、沉积微相的划分、基准面旋回的划分与对比。在详细地质研究基础上,以24个短期旋回为单位采用截断高斯模拟方法建立沉积微相三维模型,采用相控物性参数建模技术,利用顺序高斯模拟方法建立孔隙度、渗透率的三维模型。最后对模型进行了粗化,直接提供给油藏数模使用。  相似文献   

Reservoir geochemistry of the Tazhong Oilfield in the Tarim Basin, China, Part II. Migration, accumulation and mixing of crude oils     

张敏  黄光辉  胡国艺 《中国地球化学学报》2007,26(2):157-162

Measurements of the absolute and relative concentrations of nitrogen-containing compounds in crude oils from different reservoir strata (Ordovician, Silurian and Carboniferous) in the Tazhong region of the Tarim Basin, Xinjiang, China, showed that even though there are quite a number of factors affecting the distributional and compositional characteristics of neutral nitrogen-containing compounds in crude oils, the distributional and compositional characteristics of crude oils whose source conditions are approximate to one another are influenced mainly by the migration and fractionation effects in the process of formation of oil reservoirs. In addition, crude oils in the Tazhong region show obvious migration-fractionation effects in the vertical direction. Carboniferous crude oils are characterized by high migration parameters and low compound concentrations, just in contrast to Ordovician crude oils. This indicates that crude oils from shallow-level oil reservoirs were derived from those of deep-level oil reservoirs via faults, unconformable contact or carrier beds. Crude oils from the Tazhong region show some migration-fractionation effects in the lateral direction, but mixing of crude oils derived from different hydrocarbon source rocks in the process of formation of oil reservoirs made it more complicated the migration and accumulation of crude oils, as well as the formation of oil reservoirs.  相似文献   

油气田开发中后期的储层三步建模法——以赵凹油田为例     

韩登林  张昌民  李忠  李少华  张尚锋  淡卫东  李莎澜 《地质科技情报》2007,26(5):109-112

三步建模法强调建立等时地层对比格架是储层建模的关键,即首先借助地震、测井和钻井岩心等资料,利用高分辨率层序地层学理论建立精细的等时地层对比格架,继而在格架内以不同层次的旋回层序建立沉积微相模型,从而在沉积微相的约束下建立储层物性模型.三步建模法应用于赵凹油田的结果显示,所建立的模型较好地反映了储层地下特征,经验证效果较好.  相似文献   

同步辐射X射线荧光微探针技术测定太古宙条带状硅铁建造中硅质条带及包裹体的微量元素     

孟凡巍袁训来  周传明李葵发  黄宇营何伟 《岩石学报》2007,23(9):2079-2084

通过对35亿年前曹庄岩组的条带状硅铁建造(BIF)的硅质条带以及石英中包裹体微量元素的分析,初步探讨了35亿年前的 BIF 形成时期海洋的化学成分。结果表明太古宙海洋中贫乏 P、V、Cu 等生命元素,限制了真核生物的发展,而其它微量元素高度富集,为化学自养细菌提供了良好的环境。在 BIF 的硅质条带的形成过程中,微量元素的含量受到磁铁矿沉积吸附的强烈控制。  相似文献