Layer structure,petroleum accumulation system and characteristic of subtle reservoir of continental basins in eastern China:Taking Jiyang depression for example     

《中国科学D辑(英文版)》2008,(Z2)

The concept and division method for petroleum accumulation system,based on layer structure,are presented according to characteristics of layer structure and reservoirs. The petroleum accumulation system of Jiyang depression can be divided into four levels,namely petroleum accumulation system combination,petroleum accumulation system,oil-gas reservoir combination and reservoir. The petro-leum accumulation system combination includes three types of genetic pattern: other-source bur-ied-ridge accumulation system combination in pre-Paleogene,medium-deep layer self-source accu-mulation system combination in Paleogene,and shallow layer other-source accumulation system combination in Neogene. This paper also describes the reservoir types and their distribution charac-teristics of different petroleum accumulation system combinations and their interior units.  相似文献   

冀中坳陷饶阳凹陷留楚油田古近系东营组沉积微相及油气开发意义   总被引：1，自引：1，他引：0       下载免费PDF全文

张淑娟  罗永胜  刘大听 《古地理学报》2008,10(3):231-239

留楚油田位于冀中坳陷饶阳凹陷中南部留楚构造带善旺断鼻,是古近纪东营组复杂断块油藏,目前已处于中高含水期。通过对岩心描述、小层对比与划分、单砂体沉积微相描述及测井相的综合分析,总结了留楚油田河流相砂体的主要相标志,分析认为东二段、东三段沉积时期留楚地区以低弯度曲流河沉积为主,并将主力含油单砂体所在地层划分了河道、堤岸和河漫3个亚相,以及河床滞留沉积、边滩、天然堤、决口扇、河漫滩、泛滥平原6个沉积微相;结合动态资料分析,指出沉积微相对储集层物性的控制作用,探讨了不同微相砂体的渗流特征;认为应根据不同沉积微相砂体的空间展布和层内非均质性特征,进行油藏注采关系调整和确定目标潜力区,为制订合理的油气田开发调整方案提供可靠的地质依据,为同类油藏的研究与开采提供借鉴。  相似文献   

济阳坳陷中、新生代构造沉降与板块聚敛速率关系探讨   总被引：4，自引：0，他引：4  

张惬  贾东  陈竹新  王良书  陆建军  陈晓明 《高校地质学报》2005,11(4):642-648

根据回剥模型,将钻井资料与区域地震剖面相结合,对济阳坳陷内东营、沾化和惠民3个次一级凹陷进行沉降史模拟。6121钻井的沉降曲线表明济阳坳陷中、新生代的构造沉降分为6个阶段：（1）中生代残余盆地发展阶段;（2）孔店期初始裂谷阶段;（3）沙四-沙三期断陷一期;（4）沙二-沙-期断陷二期;（5）东营期断陷三期;（6）新近纪热沉降阶段。将以上构造沉降速率同太平洋板块相对欧亚板块的聚敛速率进行比较,两者相吻合,表明太平洋板块的俯冲作用是济阳坳陷从“初始裂谷-快速沉降-裂谷逐渐萎缩-热沉降”构造演化过程的主要控制因素。  相似文献   

黄骅坳陷齐家务地区的油源对比   总被引：5，自引：3，他引：2  

吴亚东  闫煜彪  唐晓川  徐永梅 《现代地质》2005,19(4):579-584

黄骅坳陷齐家务地区储油层主要为下第三系沙河街组沙一下段白云质灰岩。该区原油具有高密度、高粘度、高含硫量、中低凝固点、高初馏点和高胶质和沥青质含量等物理性质。在地球化学特征上,高碳数正构烷烃具有明显的奇偶优势,类异戊二稀烷烃具有植烷优势,甾烷组成具有明显的C₂₇ααα甾烷优势,沙一段泥页岩的三环萜烷不发育、伽马蜡烷比较发育。这些地球化学特征表明该区原油为未熟-低熟油。分析原油和沙一段泥页岩的伽马蜡烷/C₃₀藿烷与C₂₉降藿烷/C₃₀藿烷的关系以及伽马蜡烷/C₃₀藿烷与Pr/Ph之间的关系,并结合地球化学特征,认为齐家务地区的烃源岩主要是沙一下段的泥页岩。  相似文献   

南鄱阳坳陷海相烃源岩晚期生烃论证   总被引：3，自引：0，他引：3  

梁兴  叶舟  郑华平  杨斌  徐克定  张廷山  周松源 《海相油气地质》2005,10(3):7-18

南鄱阳坳陷为一“上张下压”双层结构的叠合盆地,存在海相—海陆过渡相的上二叠统茅口组和龙潭组以及上三叠统安源组三套烃源岩。烃源岩的热演化程度随上覆白垩纪—古近纪区域盖层厚度成正比增加,中燕山期不整合面附近不存在Ro值“上低下高”的跳跃式变化,白垩系沉积期末,二叠系、上三叠统烃源岩达到了地质历史上的最大埋藏深度,表明晚期叠置的白垩纪—古近纪伸展沉积盖层是导致这些烃源岩达到现今热演化程度并出现晚期生烃的根本原因。中燕山期不整合面附近存在活跃的油气显示,这些原油从地化特征上可分为两大类型。产自LT1井周家店组底部的原油是由龙潭组树皮煤(Ⅱ型干酪根)形成的典型煤成油,且以轻质油为主,未遭受过地表水氧化与生物降解改造,从而证明中燕山期以后确实存在海相烃源岩的晚期生烃。盆地模拟分析表明,坳陷内海相烃源岩晚期生烃现象普遍,生烃强度可达油(150～280)×104t/km2,气(35.5～52.4)×108m3/km2,预示着该叠合盆地晚期成藏具备烃源基础。  相似文献   

南堡凹陷老爷庙地区构造-沉积分析   总被引：2，自引：0，他引：2  

张翠梅  刘晓峰  苏明 《地球科学》2009,34(5):829-834

利用构造-沉积分析方法, 探讨南堡凹陷老爷庙横向背斜对东营组扇三角洲沉积体系的控制作用.通过对西南庄边界断层和老爷庙背斜的几何学解剖, 确定老爷庙背斜为西南庄断层断面弯曲控制的横向背斜.该背斜从沙河街组一段沉积期开始发育, 馆陶组沉积期叠加了NE向的走滑断层.含砾率统计发现, 含砾率高值均分布在横向背斜转折端、横向背斜和边界断层交汇控制了主水系的入口, 提供长距离输沙路径.从井-震结合剖面和古地貌图识别出横向背斜发育时期的上、下坡折位置.扇三角洲平原受上坡折控制, 发育在背斜转折端; 下坡折控制扇三角洲前缘和前扇三角洲的分界.边界断层控制的横向背斜在沉积盆地内普遍发育.横向背斜控制长距离输沙和相分配模式对砂体预测具有重要的意义.   相似文献   

Controls on alkylphenol occurrence and distribution in oils from lacustrine rift basins in East China     

ShuQing Zhou  HaiPing Huang 《中国科学D辑(英文版)》2008,51(7):976-983

Oils from two lacustrine rift basins in east China are thoroughly investigated using geochemical method to understand controls on alkylphenol occurrence and distribution in oils. Oils in the Lujiapu Depression, Kailu Basin are derived from the Cretaceous source rocks, and those in the Dongying De- pression, Bohai Bay Basin, from the Tertiary source rocks. All oils are experienced relatively short distance of migration and have similar maturity in each basin. Differences in homologue distributions from different oilfields are most likely caused by organic facies variation of source rocks. The oils in the Lujiapu Depression are characterized by high proportion of C3 alkylphenols (prefixes refer to the number of alkylcarbons joined to the aromatic ring of the phenol molecule) and low proportion of cre- sols and C2 alkylphenols compared to oils from the Dongying Depression. Alkylphenol isomer distri- bution is possibly affected by depositional environment especially for C3 alkylphenols. Dysoxic fresh- water environment is favorable for the formation of propyl or isopropyl substituted C3 alkylphenols, while highly reducing saline water is more suitable for trimethyl substituted C3 alkylphenols. Variations in alkylphenol concentrations within a petroleum system are controlled mainly by secondary migration processes with alkylphenol concentrations decreasing along migration direction. Interestingly, coupled with geological factors, a subtle change of alkylphenol concentrations can be applied to differentiate carrier systems. When oil migrates through sandy beds, concentrations of total alkylphenols decrease dramatically with migration distance, while such change is less significant when oil migrates vertically along faults. However, most isomer ratios potentially related to migration distance are not as effective as those alkylcarbazoles in migration diagnosis due to complicated affecting factors.  相似文献   

塔里木盆地西南坳陷油气源对比分析   总被引：1，自引：0，他引：1  

丁勇  邱芳强  李国政 《新疆地质》2000,18(1):61-67

对塔里木盆地西南坳陷油气源进行系统的对比分析。油－油对比表明原油至少可分为三类;油－源对比表明有三套烃源岩,即寒武－奥陶系、石炭－二叠系和侏罗系生油岩。气源分析表明天然气来源于腐泥型母质,属于成熟－高成熟天然气。  相似文献   

Sedimentology and geochemistry of fluvio-lacustrine tufa deposits controlled by evaporite solution subsidence in the central Ebro Depression, NE Spain   总被引：3，自引：0，他引：3  

Arenas  GutiÉrrez  OsÁcar  & Sancho 《Sedimentology》2000,47(4):883-909

The Urrea de Jalón tufa deposits constitute the 20‐ to 50‐m‐thick caprock (0·3 km²) of an isolated mesa. They disconformably overlie horizontal strata of the Tertiary Ebro Basin (NE Spain), which contains a thick succession of lacustrine gypsum and marls, followed by limestones, marls and, locally, fluvial sandstones and mudstones. The tufa deposits show a complex, large‐scale framework of basin‐like structures with centripetal dips that decrease progressively from the base to the top of the tufa succession, and beds that thicken towards the centre of the structure (cumulative wedge‐out systems). These geometries reveal that the tufa deposits were affected by differential synsedimentary subsidence. Distinct onlapping depressions reflect time migration of the subsiding areas. The studied carbonates are composed mostly of low‐Mg calcite, with minor quartz. Some samples have anomalously high contents of Fe, Mn and Ba that may exceed 1% (goethite, haematite and barite are present). Carbonate facies are: (a) macrophyte encrustation deposits; (b) bryophyte build‐ups; (c) oncolite and coated grain rudstones; (d) non‐concentric stromatolite‐like structures; (e) massive or bioturbated biomicrites; and (f) green and grey marls. Facies a and c show a great variety of microbial‐related forms. These facies can be arranged in dm‐ to 2‐m‐thick vertical associations representing: (i) fluvial–paludal sequences with bryophyte growths; (ii) pond‐influenced fluvial sequences; and (iii) lacustrine–palustrine sequences. The Urrea de Jalón tufa deposits formed in a fluvio‐lacustrine environment that received little alluvial sediment supply. Isotope compositions (δ¹³C and δ¹⁸O) reveal meteoric signatures and accord with such a hydrologically open system of fresh waters. The Fe, Mn and Ba contents suggest an additional supply of mineralized waters that could be related to springs. These would have been discharge points in the Ebro Depression of a regional aquifer of the Iberian Ranges. Rising groundwater caused the solution of the underlying evaporites and the synsedimentary subsidence of the tufa deposits.  相似文献   

塔里木盆地库车坳陷新近系和第四系沉积特征及演化^*   总被引：1，自引：0，他引：1       下载免费PDF全文

李鑫  钟大康  李勇  雷刚林  杨宪彰  吴庆宽  胡顺庆  祝海华 《古地理学报》2013,15(2):169-180

在野外露头观察和岩心描述的基础上,结合测井、地震和三维电法资料分析,认为塔里木盆地库车坳陷新近系和第四系共发育冲积扇、冲积平原、扇三角洲和湖泊4种沉积相类型;每一种沉积相可以进一步划分为若干沉积亚相和微相。新近纪吉迪克期,古近纪形成的湖泊开始向南部退缩,扇三角洲分布在山前地区;新近纪康村期基本继承了吉迪克期的沉积格局,扇三角洲的分布范围较吉迪克期大;新近纪库车期,构造抬升导致湖泊快速萎缩,山体隆升并遭受剥蚀,为冲积扇的形成提供物源,从山前到盆地中心依次为冲积扇、冲积平原和湖泊;第四纪,湖泊完全消失,以冲积扇沉积为主,冲积平原仅分布在西盐水沟-东盐水沟一线南部地区。  相似文献