Iodine-129 chronological study of brines from an Ordovician paleokarst reservoir in the Lunnan oilfield,Tarim Basin     

《Applied Geochemistry》2016

Previous studies have shown that brines in an Ordovician paleokarst reservoir of the Lunnan oilfield in the Tarim Basin, China, are the product of mixing of paleo-evaporated seawater in the east with paleometeoric waters in the west. In order to put time constraints on the brine and related hydrocarbons in this field, 10 brine samples were collected, for which the iodine concentrations and ¹²⁹I/I ratios were measured and discussed. The iodine concentration (3.70–31.2 mg/L) and the ¹²⁹I/I ratio (189–897 × 10⁻¹⁵) show that the iodine in the paleoseawater and meteoric water (MW) had different origins and ¹²⁹I characteristics. The paleoseawater has a high iodine content (∼31 mg/L), indicating that iodine was introduced into the reservoir along with thermally generated hydrocarbons, possibly in the Cretaceous, from the Caohu Sag in the eastern area. Based on consideration of all possible origins of iodine and ¹²⁹I in the brines, it is suggested that the meteoric water maintained its initial iodine content (0.01 mg/L) and ¹²⁹I/I ratio (1500 × 10⁻¹⁵), whereas the iodine-enriched paloseawater (IPSW) exhibited a secular ¹²⁹I equilibrium (N_sq = 39 atom/μL) as a result of fissiogenic ¹²⁹I input in the reservoir over a long period of time. The model of brine evolution developed on that basis confirmed that meteoric water entered the reservoir in the Miocene at about 10 Ma, and partially mixed with the iodine-enriched paleoseawater. The movement of meteoric water was facilitated by faults created during the Himalayan orogeny, then became more dense after dissolving Paleogene halite and infiltrated into the reservoir at high pressure. The iodine and ¹²⁹I concentration in the brine contains information about the path and history of the fluid in the reservoir. This may be useful in oil exploration, since the movement of water was, to some extent, related to hydrocarbon migration.  相似文献   

胜利油田近海及沿岸地区东北大风及风暴潮分析预报   总被引：1，自引：0，他引：1  

田林生 《海洋预报》2002,19(1):73-80

对产生影响胜利油田近海及沿岸地区东北大风及风暴潮灾害的两大类天气系统进行了具体分析，分别给出了冷锋配合江淮气旋产生东北大风及风暴潮的三种环流形势和两类影响胜利油田热带气旋移动路径及其预报着眼点。  相似文献   

靖安油田盘古梁长6油藏地质建模研究   总被引：1，自引：0，他引：1  

赵惊蜇  闰林  孙卫  梁晓伟  解伟 《地球科学与环境学报》2007,29(2):162-165

建立能正确反映靖安油田盘古梁长6油藏地质特征的地质模型,通过对地层格架、沉积微相、骨架砂体、物性参数和储层非均质性的分析研究,借助GMSS地质建模软件,建立了确定型精细三维地质模型。所建立的构造、砂体、属性参数模型对该油藏的地质特征有了进一步认识,为油藏的高效开发提供了依据。  相似文献   

环江油田巴19区块长7段钙夹层评价与大斜度井分段压裂优化          下载免费PDF全文

宋景远  姚谋  景文平  刘圣战  毛冠华  张恒  季长伟 《探矿工程》2021,48(10):29-35

为实现最大化油藏接触,提高油藏产出水平,长庆环江油田巴19区块长7油藏采用大斜度井开发方式。在初期压裂改造中,由于忽视了层内钙质夹层对压裂缝高的影响,导致实际裂缝的几何形态与设计产生巨大偏差,出现了邻井裂缝串通及生产高含水等问题。本文通过研究油藏剖面测井特征,在细分层位基础上分析纵向应力分布,研究“复合层效应”影响裂缝缝高延伸的关键因素,优化了分段压裂方案,获得了更好的水力裂缝几何形态和尺寸。技术调整后现场压裂工艺质量获得提高,长7段油藏压裂改造质量优良率100%,大大提高了该区块的开发水平。  相似文献   

渤中34-9油田储层敏感性评价          下载免费PDF全文

陈建宏  魏飒飒  余建生  王志超  赵海建  陈龙 《探矿工程》2021,48(9):111-118

渤中34-9油田为我国海上首个火成岩发育区的大型油田,油田位于渤中34围区,其主要目的储层为东三段和沙河街组。为加强油田储层保护,提高油气产量,本文通过分析储层岩性特征、孔渗特征和流体特征,对储层岩心进行速敏、水敏、盐敏、碱敏和酸敏储层敏感性评价,进而直观、定量地评价该油田储层损害因素,并针对性地提出预防和减少储层侵害的合理化建议,对渤中区块储层保护工作具有重要的现实意义。  相似文献   

古河道储层构型层次分析法——以弧岛油田馆陶组曲流河为例     

岳大力  王军王延忠吴胜和  刘建民束青林 《地质科学》2010,45(3):832-843

以胜利油区孤岛油田11J11密井网区曲流河储层为例,在曲流河野外露头和现代沉积原型模型研究成果的基础上,应用岩心、测井及动态等资料,探索了一套曲流河地下储层构型分析方法。在基于构型分析的精细等时地层对比及单井构型要素解释的基础上,采用“层次分析”和“模式拟合”的研究思路,按复合曲流带、单一曲流带、单一点坝以及点坝内部侧积体的4个层次进行模式拟合,对曲流河各级次构型单元内部结构进行系统分析。拟合结果既符合曲流河沉积成因理论,又与研究区动态资料吻合,说明研究成果是可靠的,由此建立了真正意义上的三维储层构型模型,再现了曲流河点坝内部泥质侧积层空间分布特征,为分析油田开发后期储层构型控制的剩余油分布规律提供了科学依据,该方法对类似油田精细储层研究有较好的借鉴作用,并能推广应用。
  相似文献   

准噶尔盆地乌尔禾油田百口泉组冲积扇沉积特征及油气勘探意义   总被引：7，自引：1，他引：6  

宫清顺  黄革萍  倪国辉  孟祥超  丁梁波 《沉积学报》2010,28(6):1135-1144

通过分析岩心、铸体薄片及测井等资料,认为准噶尔盆地乌尔禾油田百口泉组发育一套典型的退积型冲积扇沉积。百口泉组中下部发育扇中亚相,上部发育扇缘亚相,反映研究区在三叠纪早期,湖平面逐渐升高,可容空间与沉积物补给速率比值（A/S比值）逐渐增大的沉积特征。沉积微相类型包括辫状河道充填、筛状沉积、泥石流沉积及片流沉积。综合构造、测试及试油等资料,认为扇中亚相辫状河道充填为油气富集的有利储集相带,控制了油气富集的规模与油藏边界。在有利相带控制油藏分布的结论指导下部署钻探的多口评价井在百口泉组均获得工业油流,有效地指导油田现场生产。  相似文献   

胜利油田火山岩类、盆地演化及其CO₂-Au成藏成矿效应   总被引：15，自引：5，他引：15       下载免费PDF全文

赫英  王定一  廖永胜 《地质科学》2001,36(4):454-464

将胜利油田盆地内火山岩类分为石英拉斑玄武岩、橄榄拉斑玄武岩和碱性橄榄玄武岩3类。其中,碱性橄榄玄武岩多分布于盆地边部、出现较晚并受深断裂控制,其成分中明显更富碱、富轻稀土、富大离子亲石元素而贫铬、镍等相容元素和挥发分,深度大而熔融程度不高,应源于富集地幔。二氧化碳气藏与碱性橄榄玄武岩有空间、时间和成因上的关系;二氧化碳气藏区的火山岩中含有高含量的金。二氧化碳和金是盆地和火山岩类演化一定阶段的产物,源于富集地幔的岩浆去气是其形成的主要机制。  相似文献   

Hydrogen isotopic compositions, distributions and source signals of individual n-alkanes for some typical crude oils in Lunnan Oilfield, Tarim Basin, NW China     

LU Hong  LI Chao  SUN Yongge  PENG Ping’an & XIAO Zhongyao . State Key Laboratory of Organic Geochemistry  Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  China  . Tarim Research Institute of Exploration  Development of Petroleum  China Petroleum  Korla  China 《中国科学D辑(英文版)》2005,48(8):1220-1226

Petroleum mainly comprises carbon and hydrogen elements. The stable carbon isotopic analysis for whole oil was undertaken as early as the 1930s. After decades, the stable carbon isotopic analytical methods have been developed from analysis for whole oil and oil fractions (e.g., saturated, aromatic and polar frac-tions) into compound-specific isotopic analysis with the emergence of the newly developed GC-C-IRMS analytical technique. Especially, by using com-pound-specific isotopic analytical…  相似文献   

The application of gas chromatography fingerprint technique to calculating oil production allocation of single layer in the commingled well   总被引：2，自引：0，他引：2  

文志刚 朱丹唐友军  李玉泉张国荣 《中国地球化学学报》2005,24(3):257-261

1Principle SincetheGCfingerprinttechniquewasfirstused tomonitortheproductionofoilfieldsbyAmericansci entists(KaufmanandAhmed,1990;Kaufmanetal.,1987)inthe1980s,manyresearchershavetentatively appliedthismethodinseveraloilfields(HeWenxiang etal.,1996;2001;WangZhengpingetal.,2000;ChenShijiaetal.,1999)andhaveachievedsatisfac toryresults.Butthereappearsomeobviousdeficien ciesinthecourseofexplorationanddevelopment.Takinganthraceneasinternalstandard,wecalculated theabsoluteconcentrationsoffingerp…  相似文献