圈闭含油气性信息灰色聚集ART网络聚类评价法     

吴国平  徐忠祥  徐红燕 《物探与化探》2000,24(5):327-331

对托库测区 10种物探综合信息进行油气圈闭性评价,采用信息灰色聚集法压缩信息形成灰色聚集样本属性,采用ART网络聚类法自动对聚集信息进行聚类分析,达到圈闭含油气性评价的目的。该方法具有智能化程度和可信度较高的特点。  相似文献   

层序地层学及其在油气勘探中的运用   总被引：2，自引：0，他引：2  

瞿辉 《地学前缘》2000,(Z2)

起源于被动大陆边缘的层序地层学理论自 1987年问世以来 ,在地学界掀起了一场革命 ,并逐渐扩展到各种类型的盆地和环境。随着层序地层学在我国各大油田的运用 ,获得了许多成功的实例 ,已形成较为完整的研究方法和思路。层序地层学为勘探家提供了一个可预测形成油气藏的地质要素分布规律的层序格架 ,在油气勘探中具有明显的优势。针对我国目前的油气勘探开发形势 ,需要认真研究陆相层序的形成机制 ,寻找非构造油气藏 ;开展含油气大区的层序地层学研究 ,努力寻找新的勘探领域 ;重视高分辨率层序地层学的研究 ,以提高储层的预测水平和精度。  相似文献   

试论“临界成矿地质条件”     

黄富荣 《化工矿产地质》2000,(1)

“临界成矿地质条件”系指具有“临界性质”的成矿地质条件。沉积或受变质沉积矿床的临界成矿地质条件主要是古地理和水动力条件 ;内生矿床的临界成矿地质条件主要是构造条件 ;石油的生油和贮油条件所表现出的临界性质十分明显 ;风化矿床的临界成矿地质条件主要是水文地质条件、构造条件。临界成矿地质条件应该是各类矿床都具备的 ,但在不同矿床中的表现形式不同。深入研究临界成矿地质条件可以促进矿床学的进展 ,达到定量化的境地 ,同时成矿预测不应只是简单地据其某些大致相似的条件去类比、预测 ,而要努力寻找并发现最关键的具有临界性质的成矿地质条件 ,这样才不致使预测工作陷于盲目。  相似文献   

南美前陆盆地隐蔽油气藏勘探     

李涛  魏春光  何雨丹 《地球物理学进展》2012,27(1):320-325

针对南美西北部前陆盆地斜坡带低幅度构造-岩性复合圈闭隐蔽性强、识别难度大、油藏边界难以准确描述等技术难点,开展了围绕油气藏特征及分布规律、层序地层及沉积微相、地震资料精细处理和解释的综合勘探方法研究.在厄瓜多尔奥连特盆地的研究成功指导了中方区块的勘探实践,并在开发区加密井的优选和部署中发挥了关键作用.形成了一套适用于南美前陆盆地斜坡带复合型隐蔽油气藏的勘探方法和识别技术.  相似文献   

Evidence that whales (Balaenoptera borealis) visit drifting fish aggregating devices: do their presence affect the processes underlying fish aggregation?     

Patrice Brehmer  Erwan Josse  Leif Nøttestad 《Marine Ecology》2012,33(2):176-182

Evidence of the presence of a group of sei whales (Balaenoptera borealis) detected around drifting fish aggregating devices (FADs) was provided by omnidirectional multi‐beam sonar during a survey off the Seychelles (Indian Ocean). The short visit by the sei whales produced a significant change in the behaviour of the fish assemblage associated with the FAD. There was first a significant increase in fish density when the whales approached the FAD, then a marked decrease after the whales had moved away from the FAD. Furthermore, the fish density was still low, 3 h after the whales had left the FAD. We assume that the presence and behaviour of the sei whales led some of the fish initially associated with the FAD to move away from it. There has been a considerable increase in the use of drifting artificial FADs in the Indian Ocean in recent decades. The frequency of cetacean visits to drifting FADs in the Indian Ocean is unknown, but they may have a major impact on assemblages of pelagic fish species around FADs. The effect of marine mammals on FAD‐associated fish could be relevant to the ecological trap theory (FAD acting as a trap for their associated fish) because of their impact on the dynamics of fish aggregation processes, through commensalism and/or predator–prey interactions.  相似文献   

多种方法综合探讨白云凹陷深水沉积岩性圈闭边界     

石宁  刘军  颜承志  柳保军  胡琏  张卫卫  吴亚娇 《现代地质》2014,28(6):1289-1296

为降低深水勘探风险,准确识别白云深水区岩性圈闭边界,采用多种技术手段相结合的方法,对深水沉积岩性圈闭的边界进行研究。在层序地层格架、沉积体系控制下,锁定岩性圈闭形成的有利区带;建立深水重力流沉积储层岩相组合正演模型;利用地震波形分析技术,识别储层与非储层,精细刻画水道沉积充填特征、扇体内部结构、砂体堆砌方式等微观结构;结合储层反演,以及多种地震属性,进一步综合识别岩性圈闭边界。研究成果总结了白云深水陆坡重力流水道砂岩,斜坡扇、盆底扇砂岩岩性圈闭的边界识别特征,并应用到勘探实践中,取得了良好的勘探成果。  相似文献   

孤北地区断阶式坡折沉积层序特征与隐蔽圈闭预测   总被引：5，自引：0，他引：5  

魏魁生  李培祝  龙更生  田波  毕研鹏 《现代地质》2003,17(3):303-310

根据地质、钻井及地震等资料的综合分析,将下第三系划分为1个一级层序、4个二级层序、10个层序组、17个三级层序和54个体系域,建立了层序地层格架,并以体系域为单位恢复了古环境和沉积体系。研究表明,可容纳空间的变化可与裂陷作用、盆地底板沉降作用、基准面变化、海洋与大陆气候影响作用、局部褶皱、断裂、底辟、火山活动等、多物源沉积物充填及古环境变迁等相联系。在孤北地区通常具有3阶坡折,沉积物具有逐阶搬运、扩散的特征:首先在靠近盆地的三阶坡折附近形成低水位扇,在靠近孤岛凸起的一阶坡折之下形成特殊的低水位期冲积扇或辫状河道沉积或沉积物呈过路作用;接着在二阶坡折和三阶坡折之间形成低水位楔;最后在一阶坡折之下和二阶坡折附近发生下切河谷充填作用。低水位期形成的低水位扇、低水位楔、辫状水道及下切谷充填砂都可能构成有效储层,成为非构造圈闭赋存的重要位置。  相似文献   

Modern pollen-rain characteristics of tall terra firme moist evergreen forest, southern Amazonia     

William D. Gosling  Francis E. Mayle  Timothy J. Killeen 《Quaternary Research》2005,64(3):284-297

The paucity of modern pollen-rain data from Amazonia constitutes a significant barrier to understanding the Late Quaternary vegetation history of this globally important tropical forest region. Here, we present the first modern pollen-rain data for tall terra firme moist evergreen Amazon forest, collected between 1999 and 2001 from artificial pollen traps within a 500 × 20 m permanent study plot (14°34′50″S, 60°49′48″W) in Noel Kempff Mercado National Park (NE Bolivia). Spearman's rank correlations were performed to assess the extent of spatial and inter-annual variability in the pollen rain, whilst statistically distinctive taxa were identified using Principal Components Analysis (PCA). Comparisons with the floristic and basal area data of the plot (stems ≥10 cm d.b.h.) enabled the degree to which taxa are over/under-represented in the pollen rain to be assessed (using R-rel values). Moraceae/Urticaceae dominates the pollen rain (64% median abundance) and is also an important constituent of the vegetation, accounting for 16% of stems ≥10 cm d.b.h. and ca. 11% of the total basal area. Other important pollen taxa are Arecaceae (cf. Euterpe), Melastomataceae/Combretaceae, Cecropia, Didymopanax, Celtis, and Alchornea. However, 75% of stems and 67% of the total basal area of the plot ≥10 cm d.b.h. belong to species which are unidentified in the pollen rain, the most important of which are Phenakospermum guianensis (a banana-like herb) and the key canopy-emergent trees, Erisma uncinatum and Qualea paraensis.  相似文献   

吹扫捕集-气相色谱法测定水中七种氯苯类化合物   总被引：4，自引：1，他引：4  

张月琴吴淑琪  张淑芬 《岩矿测试》2005,24(3):189-192196

试验了三种色谱柱的分离效果,选用自制的环糊精毛细管柱,用吹扫捕集气相色谱法对水体中七种氯苯类化合物进行分析,优化了吹扫捕集的主要工作条件。方法的线性范围为1~100nL/L,重现性良好,6次重复测定的RSD为3.62%~6.98%。进样量5mL时,其检出限可达0.5nL/L,较之液液萃取灵敏度提高了至少50倍。  相似文献   

Transport process of radionuclides in the East China Sea     

Masatoshi Yamada Tatsuo Aono Jian Zheng 《中国地球化学学报》2006,25(B08):162-162

Settling particles were collected from six stations at the Okinawa Trough and the East China Sea continental margin. Activities of U, Th, Pu isotopes and ^210Pb were determined for the particles to elucidate their transport processes. Surface sediment samples were also analyzed for their isotopes. There was a tendency for ^210Pb activities to increase almost linearly with depth from 72 m on the continental shelf edge to 1019 m in the Okinawa Trough. Increasing ^210Pb activities in settling particles with depth on the continental margin may be attributable to enhanced ^210Pb scavenging by particles and removal near the front. There also was a clear tendency for total mass fluxes and the radionuclide fluxes to increase with depth, with an especially large increase near the bottom. The ratio of the observed ^210Pb flux to the ^210Pb deficiency flux in the near-bottom traps ranged between 8.9 and 46. These high values show a strong ^210Pb excess which would be attributable to large advective import to the near-bottom and resuspended particles that have settled through the water column but have not been incorporated into the sediments. High variability of radionuclide fluxes occurred in very short time periods. Activities of ^238U, ^232Th, ^230Th, ^228Th, ^210Pb and ^239Pu＋^240Pu in settling particles were significantly higher than those in the underlying surface sediments.  相似文献