Nature and origin of ground ice,Sandhills Moraine,southwest Banks Island,Western Canadian Arctic

The Sandhills Moraine is a Late Wisconsinan lateral moraine complex on southwest Banks Island. The occurrence of ice-ablation landforms, ground ice slumps, kettle lakes and catastrophic lake drainage in winter suggests the presence of substantial bodies of massive ground ice. The distinctive hummocky topography of the Sandhills Moraine is thought to reflect partial melt-out of this ice. Stratigraphic observations indicate that the ice is overlain irregularly and unconformably by glacigenic sediments, notably pebbly clay (till) and/or sandy gravels (outwash), while the ice itself possesses numerous and variable mineral inclusions, faults and foliations. Petrofabric analyses indicate a strongly preferred orientation to the ice crystals. It is suggested that these characteristics are best explained if the ground ice is interpreted as relict glacier ice.     

断陷湖盆隐蔽油藏预测及勘探的关键技术--高精度地震探测基础上的层序地层学研究

近十余年世界的我国隐蔽油藏勘探取得了巨大进展,其关键技术是高精度的三维地震及在此基础上的层序地层学研究,二者的结合已被油气产业部门当作勘探中的“权威性技术”。断陷湖盆在我国东部含油气资源的重要性居首位,控制层序形成演化的诸因素中,构造,古气候和在区域古地理格局中的位置对湖盆的类型和演化起着决定作用,需要按照断陷湖盆的沉积构造演化特征建立有预测功能的层序构成模式,在成熟的勘探区,重新建立等时层序地层格架,进行体系域精度的工业制图,阐明沉积体系的分布规律,使用高精度地球物理技术对圈闭定位,并对构造坡折带和低位域扇体给予重点注意,用这种技术方法指导隐蔽油气藏的勘探,已经并必将有许多重要发现。     

中扬子区海相沉积盆地性质研究

分析了中扬子区海相沉积盆地基底和层序充填特性;研制了M判别图解,研究了沉积盆地的性质,认为盆地基底具有三分性,盆地层序充填具有阶段性和分区性,沉积盆地主体具有克拉通盆地的特点和性质。     

Geostatistical mapping of geomorphic variables in the presence of trend

Mapping geomorphic variables geostatistically, specifically by kriging, runs into difficulties when there is trend. The reason is that the variogram required for the kriging must be of residuals from any trend, which in turn cannot be estimated optimally by the usual method of trend surface analysis because the residuals are correlated. The difficulties can be overcome by the use of residual maximum likelihood (REML) to estimate both the trend and the variogram of the residuals simultaneously. We summarize the theory of REML as it applies to kriging in the presence of trend. We present the equations to show how estimates of the trend are combined with kriging of residuals to give empirical best linear unbiased predictions (E‐BLUPs). We then apply the method to estimate the height of the sub‐Upper‐Chalk surface beneath the Chiltern Hills of southeast England from 238 borehole data. The variogram of the REML residuals is substantially different from that computed by ordinary least squares (OLS) analysis. The map of the predicted surface is similar to that made from kriging with the OLS variogram. The variances, however, are substantially larger because (a) they derive from a variogram with a much larger sill and (b) they include the uncertainty of the estimate of the trend. Copyright © 2006 John Wiley & Sons, Ltd.     

黄骅坳陷新近系馆陶组Ⅲ段辫状河相高分辨率层序分析

以高分辨率层序地层学理论为指导,以野外露头、钻井岩心、测井及地震资料的综合研究为基础,研究了黄骅坳陷新近系馆陶组Ⅲ段的高分辨率层序地层特征,识别出1个长期、两个中期和若干个短期基准面旋回层序。其中短期、中期旋回都可分为向上“变深”非对称型和向上“变深”复“变浅”对称型两类。深入探讨了不同结构类型和充填样式的各级次基准面旋回层序对储层的控制作用,认为储集砂体主要发育于长期及中期基准面旋回上升的早期。     

公婆泉盆地下白垩统新民堡群层序地层和铀成矿特点

本文论述了公婆泉盆地下白垩统新民堡群的层序地层特点———层序分布和时代、界面特征和内部构成、沉积相,以及层间氧化带和铀矿化特点。认为该盆地在公婆泉地段具有一定的找铀矿远景,但北骆驼泉地段铀成矿条件不佳,那林疏怀地段不具备铀成矿远景。     

伊犁盆地侏罗系水西沟群层序地层学研究

伊犁盆地侏罗系水西沟群是一套在基本一致的构造应力和沉积环境下形成的含煤碎屑岩建造,但在这套地层的中部(三工河组)出现了岩性、颜色的突变,并且对应的测井曲线也出现明显的突坎现象。笔者运用层序地层学的观点,从年代地层、岩性、体系域、沉积韵律以及测井曲线解释等5方面对这一现象进行了分析,认为该群中部存在一不整合面(或层序界面),并尝试对水西沟群层序地层进行重新划分。     

准噶尔盆地腹部侏罗系层序地层划分

根据工区内现有的钻井、测井和地震资料,应用以基准面为参照格架的高分辨层序地层学理论与研究方法,对准噶尔盆地腹部侏罗系进行了层序界面的识别.共识别出层序界面7个,对应划分出1个长期基准面旋回和6个中期基准面旋回,长期基准面旋回界面的性质为区域性角度不整合,中期基准面旋回界面性质包括局部不整合、沉积转换面和同沉积侵蚀面.沉积转换面的识别对中期基准面旋回界面的识别起重要作用.     

塔中地区寒武—奥陶系层序地层格架与沉积演化特征

通过层序地层学的划分与对比,将塔中地区寒武—奥陶系划分出8个超层序.其中寒武系包含3个超层序,奥陶系包含5个超层序,下奥陶统2个,中上奥陶统3个.塔中地区寒武—奥陶系沉积相具有典型的分层结构,沉积相在纵向演化上,由下部的蒸发台地、局限台地相、开阔台地相,向上变为台地边缘相、浅水陆棚相、混积陆棚相及斜坡相,代表了海水向上持续增深过程.