海拉尔盆地贝西地区坡折带成藏类型划分

目的对海拉尔盆地贝西斜坡主要勘探目的层系进行层序、体系域划分及扇体的刻画。方法以层序地层学等理论为指导,以工作站LANDMARK,GEOPROBE地震岩性圈闭识别和储层预测等技术为手段。结果根据形态特征将贝西地区的坡折带类型划分为反向断阶型、断折型、坡折型和简单弯折型4种;反向断阶型有利于构造油气藏的形成,断折型和坡折型有利于构造-岩性油气藏的形成,简单弯折型有利于岩性油气藏的形成。结论贝西斜坡的中坡折带是油气勘探的重要领域。     

石羊河流域生态功能区研究

干旱区内陆河流域生态系统组成要素和影响因素的区域差异性决定了不同区域具有不同的生态功能.地处甘肃河西走廊东段的石羊河流域生态环境的恶化正是流域生态功能紊乱的表现.本文分析了石羊河流域生态环境存在的问题及成因,并尝试对流域作两级功能区划分,讨论了不同生态功能区的作用及其调控对策.流域生态功能区划是流域综合管理的基础,有利于流域生态系统的稳定,有利于区域资源优势的发挥.     

松辽盆地深层古前陆盆地地层特征及其油气勘探意义

松辽盆地是中国最大的石油生产基地,也是目前世界上已发现特大油田、油气资源最为丰富的非海相沉积盆地.根据最新的研究成果,松辽盆地深层存在一套早中生代(T3-J1 2)含煤和火山岩的古前陆盆地沉积.这套地层的发现对松辽盆地深层油气勘探,特别是天然气勘探有着极其重要的意义.     

Petroleum enrichment characteristics in Ordovician carbonates in Lunnan area of Tarim Basin

Lunnan heave had experienced denudation during late Caledonian and Hercynian movements and reconstruction during Indosinian movement. Lunnan heave and its circumference areas are located on the direction of petroleum migration, and experienced three reservoir formation cycles that are divided by wave cycle: The first reservoir formation cycle is characterized by breakage, the second by alteration, and the third by enrichment. Three layers of dissolving-cave developed on the vertical in Lunnan area. Development degree of slit-cave system and their connectivity are important factors to control petroleum enrichment in the weathering crust reservoir. The area where dissolving-caves are communicated by silts and faults was a fine petroleum enrichment area, and water was often encountered in the area with isolation cave while drilling because of no oil and gas origin. The top part of the faulted-horst as a leaking area is bearing water area, and the higher part of slope nearing the top part of the faulted-horst as a high seepage area is a heavy oil area due to lack of fine caprock, and the lower part of slope and the platform are light and condensate oil area. The area with the middle-upper Ordovi-cian is the favorable area to explore original carbonate reservoir formed in the earlier stage. The best favorable petroleum enrichment area for carbonates is surrounding Lunnan heave along the slope down to the direction of sags. The precondition to discover petroleum in carbonates is accurately prognosticating the distribution area of silts and caves, and the key to improving the exploration success ratio is accurately recognizing silts and small faults.     

渭干河流域植被覆盖时空变化特征研究

植被是联结土壤、大气和水分等要素的自然纽带,更是自然生态系统中最活跃的因子,植被变化可用来揭示环境的演化,并且能在全球变化研究中起到“指示器”的作用.本研究利用遥感影像获取NDVI数据,借助遥感与GIS等现代手段,运用多种方法对渭干河流域1989-2007年植被覆盖变化特征和发展趋势进行了定量研究,最终得出渭干河流域植被覆盖时空变化规律.     

沁水盆地中东部热演化史模拟及油气成藏响应

为还原沁水盆地中东部热演化史,以某页岩气井山西组及太原组26件海陆过渡相泥页岩实测数据为基础,利用Petro Mod软件进行了热演化史模拟,依据模拟结果对油气生成及成藏进行了分析,结果表明:研究区内烃源岩干酪根类型以Ⅲ型为主,有机质演化成熟度高,具有良好的生烃潜力;热演化史与构造演化史存在耦合作用,受印支运动及燕山运动影响,地层温度经历了缓慢上升-缓慢冷却-异常高温-快速冷却四个阶段;太原组及山西组烃源岩有机质演化过程中镜质组反射率(Ro)值发生一次跃变,最终演化至2. 0%左右,于早白垩世烃源岩发生二次生烃作用进入产气阶段,加之上覆致密的盖层形成了良好的煤系气藏。     

Gill arches of some teleostean fishes of the families Girellidae,Pomacentridae, Embiotocidae Labridae and Scaridae

Summary

Streams and meander lakes in the Mato Grosso, between the Rio das Mortes and the Rio Suiá Missú, have low conductivities ranging from 12 to 50 μmho/cm/20°c, but exceptional isolated pools reach 800 μmho under the influence of evaporation.

Rainfall at the beginning of the wet season had conductivities up to 110 μmho, but the general level of conductivity fell as the wet season progressed.

Run-off water flowing over the ground during heavy rain generally had a higher conductivity than the rain.

Short-term fluctuations in the conductivity of small streams showed increases with heavy rain accompanied by surface run-off.

The rainfall had a high calcium to sodium ratio. It is estimated that during the period from 1 September to 30 November 1968 the rainfall supplied the area with at least 4 kg Ca per hectare.     

A reassessment of neotropical species of Corvospongilla (Porifera: Spongillidae)

This paper expands the known geographic distribution of Corvospongilla seckti Bonetto and Ezcurra de Drago, 1966 to another two Brazilian hydrographic basins, the East Atlantic and São Francisco basins. Simultaneously, it reassesses the status of C. seckti and Corvospongilla volkmeri De Rosa Barbosa, 1988. Re-examination of the holotype of C. volkmeri revealed no remarkable diagnostic features to differentiate it from C. seckti, given our present knowledge on the variability of the latter. Accordingly, C. volkmeri is considered a junior synonym of C. seckti.     

Sipunculans and echiurans from the deep Angola Basin

Sipunculans and echiurans collected by the “DIVA 1” expedition by RV Meteor (Cruise M48/1) to the deep‐sea bottom of the Angola Basin are recorded. Seven species from five genera and two separate phyla are recognized; only the echiuran Pseudoikedella achaeta has not been recorded hitherto in the southern sector of the Atlantic Ocean. A gradient analysis using redundancy analysis (RDA) under the CANOCO package indicates the existence of a neat latitudinal gradient of sipunculans along the Angola Basin from the southernmost stations towards the northern ones. The local abundance of abandoned horny tubes of polychaetes at some of the sampling sites of the northernmost stations explains the dense aggregations of Nephasoma diaphanes. This species exhibits an opportunistic lifestyle inside empty polychaete tubes on the abyssal plains of the Angola Basin.     

鄂尔多斯盆地陕北斜坡带三叠系延长组和侏罗系油气成藏期研究

通过对鄂尔多斯盆地烃源岩的生烃史、构造运动特征、包裹体均一温度和伊利石K-Ar同位素定年的研究,结合研究区的裂缝发育特征,综合分析了三叠系延长组和侏罗系油气成藏期.鄂尔多斯盆地形成演化过程中经历了多期构造运动,其中影响最大的是早白垩世末期的构造运动.长7段泥质烃源岩在早白垩世初期开始大量生烃,对侏罗系延9段裂缝储层和三叠系延长组伊利石K-Ar同位素定年以及对储层流体包裹体均一温度分析显示,陕北斜坡带三叠系延长组油藏形成于早白垩世的早中期,而侏罗系延安组的油藏则形成于早白垩世末的构造抬升期,对应时间为晚白垩世早—中期.