四川华蓥二叠-三叠系界线剖面稳定碳同位素变化特征及其生物地球化学循环成因

对四川华蓥楼房湾剖面稳定碳同位素进行的研究表明,该地区二叠-三叠系界线附近碳同位素变化趋势与全球变化基本一致。早三叠世早期ΔB平均值高于晚二叠世晚期,指示海水中磷酸盐浓度的增大和初级生产力的繁盛。从晚二叠世末期开始δ13Ccarb的缓慢降低是由大规模火山作用以及陆地风化作用加强造成的;早三叠世最早期δ13Ccarb和δ13Corg的快速同步降低所代表的全球碳循环变化主要受控于生物集群绝灭的主幕及海平面上升引起的底部缺氧水上涌。总之,二叠-三叠纪之交碳同位素变化是火山作用、海平面变化、海洋和陆地生物集群绝灭以及缺氧水上涌等因素综合作用的结果。     

提升四川省第三方物流企业竞争力

第三方物流作为现代经济的重要组成部分,正在全球范围内得以迅速发展。伴随着经济的发展以及政府的大力扶持,四川的第三方物流也在快速发展。本文在对四川省第三方物流现状分析的基础上,指出我省第三方物流企业仍存在许多不足,为促进四川省物流业的发展,在竞争中立于不败之地,第三方物流企业必须不断提升自身的竞争力。本文就如何提升我省第三方物流企业的竞争力进行了探讨,提出了一些具体的建议。     

东方大桥自振特性分析

以常州市京杭运河改线段改建工程——东方大桥为研究对象,借助ANSYS有限元程序,建立了飞燕式钢管混凝土提篮拱桥的空间力学计算模型。利用子空间迭代法计算了桥梁结构的自振频率和振型,对桥梁的模态特性进行了分析。结果表明,桥梁的面内刚度相对于面外刚度较小。计算结果可为桥梁的设计、施工以及使用阶段的健康检测和维护提供技术参数和依据。     

四川省城镇居民全民健身的现状及发展对策

运用文献资料和问卷调查等研究方法,对四川省16个城镇的健身人口、健身形式、健身设施等现状调查,分析了制约四川省城镇全面健身运动发展的原因,提出四川省城镇全民健身运动发展的对策与建议,力求为探索我国城镇全民健身运动发展提供科学的理论依据．     

四川盆地元坝地区飞仙关组二段滩相储层孔隙演化特征

通过岩石薄片、阴极发光、电子探针和流体包裹体分析等方法,对元坝地区飞仙关组二段滩相储层发育特征及影响储层孔隙形成、保存的主要成岩作用进行详细研究,并结合烃类充注期次,探讨滩相储层的孔隙演化模式。结果表明:研究区储层以鮞粒灰岩为主,粒间溶孔和粒内溶孔等次生孔隙构成主要的储集空间;储层孔隙的形成受泥晶化、溶蚀、胶结充填、压实压溶、构造破裂等多种成岩作用影响,其中大气淡水溶蚀作用是储层次生孔隙形成的关键,I期埋藏溶蚀作用为烃类充注提供了良好的通道和储集场所,而大气淡水方解石胶结作用则对次生孔隙保存起到明显的破坏作用;研究区储层孔隙演化经历了石油充注前形成溶孔且孔隙增减交替变化、油向气转化期溶孔孔隙减少、油向气转化后形成裂缝、溶孔且孔隙缓慢增加3个阶段。     

四川盆地东南缘清虚洞组层序-岩相古地理特征及其油气地质意义

通过对钻井岩屑描述、测井资料解释、野外露头观察、岩石薄片鉴定和样品测试数据的综合分析,将四川盆地东南缘下寒武统清虚洞组划分为1个Ⅲ级层序和3个准层序组,在准层序组内又划分出体系域,在此基础上对清虚洞组层序地层学特征进行了分析,编制了各准层序组沉积体系域的层序-岩相古地理图。sq1-TST 期,受持续海侵影响,主要为开阔台地沉积,浅滩规模较小;sq1-HST 期局限台地潮坪-湖相沉积较发育。sq2-TST 期台内滩沉积最为发育,也是清虚洞组颗粒滩相储层最发育的层位;sq2-HST 期沉积格局演变为局限台地潮坪环境。sq3准层序组仅残留高位体系域沉积记录,属于频繁暴露的潮坪环境,以膏岩类沉积为主要特征,为灯影组和清虚洞组天然气藏重要的区域性致密盖层发育层位。     

川西拗陷雷四3亚段高频层序特征及控制因素

在川西拗陷中三叠统雷口坡组沉积背景研究基础上,通过岩心、薄片观察和测井、地震资料分析,运用层序地层学原理,研究雷四3亚段高频层序发育特征,对雷四3亚段进行精细层序地层对比,落实层序地层在研究区展布情况,探讨其发育控制因素及与储层发育的关系.雷口坡组可划分出2个Ⅲ级层序,雷四3亚段发育于第2个Ⅲ级旋回sQ2高水位体系域,进一步可识别出2个Ⅳ级层序和7个Ⅴ级层序.在高频层序划分的基础上,建立了雷四3亚段高频层序地层格架,以Ⅴ级层序为单元,对研究区雷四3亚段地层进行精细对比发现,层序地层横向具有较好的对比性,XS1井、DS1井、TS1井缺失顶部地层,分析认为与印支期地层剥蚀有关.川西拗陷雷四3亚段层序发育主要受海平面升降、构造运动及气候影响,Ⅴ级层序以向上变浅的旋回为主,溶蚀作用主要发育在Ⅴ级层序中上部,易形成优质溶蚀型储层.     

高校网络教育学习支持服务系统的研究与改进

通过对四川大学网络教育学院学习支持服务体系现状的调研,提出了改进学习支持服务体系建设的相关建议。     

Control of coupling among three major factors for formation of high-efficiency gas reservoir A case study on the oolitic beach gas reservoir in Feixianguan Formation in the northeast Sichuan Basin

Through a case study of the high-efficiency gas reservoir in Feixianguan Formation in the northeast Sichuan Basin, quantitative and semi-quantitative analyses of key elements such as hydrocarbon generation, migration and accumulation, and reservoir evolution as well as their interplay in the critical moment of reservoir formation controlled by the energy field were carried out, by means of numerical modeling of the energy field. It was found that the climax time for Permian hydrocarbon generation was Late Triassic-Early Jurassic and accumulation of oil and gas has resulted in large-scale paleoreservoirs in paleostructural traps in Feixianguan Formation, a process facilitated by fractures connecting the sources. The paleoreservoirs have been turned into high-efficiency gas kitchens due to pyrolysis, which resulted from deep burial at a temperature of 170-210℃ as induced by tremendously thick sedimentation in the foreland basin of Daba Mountain in Late Jurassic-Cretaceous period. Meanwhile, abundant acid gas like H2S produced from thermo-chemical sulfate reduction （TSR） at high temperatures leads to extensive dissolution of dolostone in the paleoreservoirs, which may in turn result in modification of the reservoirs and preservation of the reservoir rock porosity. The present distribution of gas reservoirs was ultimately determined in the processes of adjustment, cooling and decompression of the paleoreservoirs resulting from intense deformation in the front of Daba Mountain during the Himalayan orogeny.     

The controlling factors and distribution prediction of H2S formation in marine carbonate gas reservoir, China

Generally, there are some anhydrites in carbonate reservoir, as H2S is also familiar in carbonate oil and gas reservoirs. Nowadays, natural gas with high H2S concentration is usually considered as TSR origin, so there is close relationship between H2S and anhydrite. On the contrary, some carbonate rocks with anhydrite do not contain H2S. Recently, researches show that H2S is only a necessary condition of H2S formation. The reservoir porosity, sulfate ion content within formation water, reservoir temperature, oil/gas and water interface, hydrocarbon and some elements of reservoir rock have great controlling effects on the TSR occurrence. TSR deoxidizes hydrocarbon into the acidic gas such as H2S and CO2, and the H2S formation is controlled by TSR occurrence, so the relationship among reaction room, the contact chance of sulfate ion and hydrocarbon, the reservoir temperature has great influence on the TSR reaction. H2S has relatively active chemical quality, so it is still controlled by the content of heavy metal ion. Good conditions of TSR reaction and H2S preservation are the prerequisite of H2S distribu- tion prediction. This paper builds a predictive model based on the characteristic of natural gas reservoir with high H2S-bearing. In the porosity reservoir with anhydrite, the formation water is rich in sulfate and poor in heavy metal ion. Oil and gas fill and accumulate in the gas reservoir with good preservation conditions, and they suffered high temperature later, which indicates the profitable area of natural gas with high H2S-bearing.