鄂尔多斯盆地姬塬地区长8油层组高分辨率层序分析

以高分辨率层序地层学原理为指导,利用钻井岩芯、测井和岩矿分析等资料,对鄂尔多斯盆地姬塬地区延长组长8油层组进行沉积相和基准面旋回划分,将其确定为浅水三角洲沉积体系,划分为2个中期（MSC1和MSC2）和6个短期（SSC1～SSC6）基准面旋回。研究表明:长82沉积期研究区主要为湖域扩大的三角洲前缘及前三角洲沉积环境;长81沉积期,研究区主要为三角洲平原沉积环境;分析了不同级别的基准面旋回叠加式样与沉积相展布、演化规律之间的关系,并与正常沉积的三角洲层序发育特征进行了对比。在此基础上,以短期旋回为单元,建立了高分辨率层序地层格架和编制了长81和长82的层序—岩相古地理图,得出相对正常的三角洲而言,浅水三角洲沉积体系具有A/S（可容纳空间/沉积物补给）较小、河口坝不发育、有利储层发育的微相为长距离延伸的分流河道砂体和分流河道砂体主要发育在短期上升半旋回的结论。     

Oceanographic and eustatic control of carbonate platform evolution and sequence stratigraphy on the Cretaceous (Valanginian–Campanian) passive margin,northern Gulf of Mexico

An integrated sequence stratigraphic study based on outcrop, core and wireline log data documents the combined impact of Cretaceous eustacy and oceanic anoxic events on carbonate shelf morphology and facies distributions in the northern Gulf of Mexico. The diverse facies and abundant data of the Comanche platform serve as a nearly complete global reference section and provide a sensitive record of external processes affecting Cretaceous platform development. Regional cross‐sections across the shoreline to shelf‐margin profile provide a detailed record of mixed carbonate–siliciclastic strata for the Hauterivian to lower Campanian stages (ca 136 to 80 Ma). The study window on the slowly subsiding passive margin allows the stratigraphic response to external forcing mechanisms to be isolated from regional structural processes. Three second‐order supersequences comprised of eight composite sequences are recognized in the Valanginian–Barremian, the Aptian–Albian and the Cenomanian–Campanian. The Valanginian–Barremian supersequence transitioned from a siliciclastic ramp to carbonate rimmed shelf and is a product of glacial ice accumulation and melting, as well as variable rates of mid‐ocean ridge volcanism. The Aptian–Albian supersequence chronicles the drowning and recovery of the platform surrounding oceanic anoxic events 1a and 1b. The Cenomanian–Campanian supersequence similarly documents shelf drowning following oceanic anoxic event 1d, after which the platform evolved to a deep‐subtidal system consisting of anoxic/dysoxic shale and chalk in the time surrounding oceanic anoxic event 2. Each period of oceanic anoxia is associated with composite sequence maximum flooding, termination of carbonate shelf sedimentation and deposition of condensed shale units in distally steepened ramp profiles. Composite sequences unaffected by oceanic anoxic events consist of aggradational to progradational shelves with an abundance of grain‐dominated facies and shallow‐subtidal to intertidal environments. Because they are products of eustacy and global oceanographic processes, the three supersequences and most composite sequences defined in the south Texas passive margin are recognizable in other carbonate platforms and published eustatic sea‐level curves.     

溪洛渡地区节理构造特征及解析

运用构造解析方法，遵循共轭节理配套原则对溪洛渡地区发育的次生节理构造进行逐步分析，将该区发育的北东向和北西向节理、近南北向和近东西向节理、倾向南东和北西的两组北东－南西向剖面节理、北东东向和北北东向节理以及倾向北东和南西的两组北西－南东向剖面节理组成5套共轭节理，分属南北向、北东向和北西向3个构造期次。据此推出该区次生节理的形成、发育先后受到该区南北向、北东向和北西向构造期构造应力场作用的影响和制约。     

南黄海中部隆起海相中-古生界科学钻探CSDP-2井选址

2014年,大陆架科学钻探项目（CSDP）确定采用自主研发的轻便型海洋钻井平台"探海1号"在南黄海盆地中部隆起上实施首口科学钻探井（CSDP-2井）,其科学目标是探查中部隆起的中-古生界地质结构和油气地质条件,解决南黄海中部隆起海相残留盆地长期悬而未决的地层属性问题,同时为区域地质、海陆演化与海相油气资源前景研究和评价提供基础资料。据此确定钻孔的选址原则为：钻探海域水深不超过30 m,在预定2 800 m的钻探深度范围内钻遇多套完整的中-古生界海相地层。根据钻探目标和选址原则,针对中部隆起没有钻探资料的状况,以区域地质特征和周边钻井对比为参考,以地震资料多属性解释为手段,标定了地震反射层位,解释并编制了反射层构造图,拟定了钻探井位,预测了钻探层位;采用地震储层预测技术预测了有利储层。上述工作形成了无井勘探区的钻探井位部署技术流程和方法,经钻探厘定了三叠纪-奥陶纪海相沉积层,并发现了多个油气显示层,达到了预定钻探目标。     

安徽黄山地区侏罗纪—白垩纪层序地层学特征

通过 1∶ 5万区域地质调查工作对屯溪—休宁盆地、歙县洪琴盆地、绩溪华阳盆地、祁门盆地各类陆相沉积建造的沉积环境、沉积相、陆相沉积体系域进行了分析描述 ,将侏罗纪—白垩纪地层划分为四级地层层序 ,在层序地层学分析的基础上 ,建立了初步的红盆地层格架     

东营凹陷盐-泥层构成及其特征

含盐层序原始沉积的典型特征是盐类岩石与超压泥岩等构成互层的多韵律结构.盐和泥作为一个整体, 与纯粹的厚层的盐或泥相比, 其塑性变形能力和行为具有特殊性.针对这一特点, 提出了盐-泥层和盐-泥构造的概念.盐-泥层是指盐类岩石与超压泥岩呈互层的沉积层序, 具有一定的塑性或流动性.盐-泥构造是由盐-泥层的流动变形而形成的一类构造样式.盐-泥层的概念在含盐盆地中具有较广泛的适用性.      

乌石凹陷古近系层序地层特征及充填演化

依据层序地层学、沉积学理论方法,综合地震剖面、钻测井、岩心、古生物、地球化学等资料研究认为;乌石凹陷古近系可识别3种级别不整合面,划分为7个三级地震(测井)层序,是一个进积(加积)—退积—加积序列。构造沉降是控制层序几何形态,充填叠置方式、演化及沉积体系分布的最重要因素:凹陷由多个半地堑在不同层序发育时期以不同方式叠置联结而成;受断层控制,层序外部形态有箱状-楔形、楔形-席状披覆型,边界终止方式有双断终止型、单断终止超覆型;不同构造演化阶段层序内部充填的沉积体系各具特征,初始断陷阶段的SQ1沉积冲积层序,强烈断陷阶段的SQ2—SQ4充填湖相层序,晚期断陷阶段SQ5—SQ7内部充填浅湖和河流三角洲沉积;同沉积断层陡坡带沉降迅速、可容纳空间快速增长,是凹陷的沉积和沉降中心,断陷期主控断裂活动时间和空间的变化导致了凹陷沉积和沉降中心的迁移。     

陆相断陷湖盆强制湖退及沉积响应:以莱州湾凹陷沙三段为例*

强制湖退体系域(FSST)是由相对湖平面下降驱动、发育于相同层序高位体系域之上及新层序低位体系域之下、在相对湖平面下降时期形成的、与油气勘探关系密切的一种退覆地层,与沉积物供给的变化无关。基于三维地震、钻井岩心和测录井资料,在层序地层学和沉积学理论指导下,发现莱州湾凹陷古近系沙河街组三段发育一套强制湖退体系域地层,垂向上可划分为3期,自下而上命名为P1、P2和P3,P1向湖盆中央终止于FSST底界面,P3顶部为显著不整合的层序界面。顺物源方向地震响应特征为缺失顶积层的低角度斜交前积反射,该反射自西向东推进到湖盆中央;在垂直物源方向的地震剖面上,可见下切谷地震响应。测井响应GR曲线呈漏斗状的复合体,表明沉积响应为上粗下细的反旋回。岩心及测井相分析结果表明,该FSST为一套河流—三角洲沉积体系,三角洲前缘伴生滑塌湖底扇沉积体。综合盆地区域构造演化、沉积物供给和气候变化等因素,认为该套沉积体系是气候相对干旱和绝对湖平面下降的共同产物。莱州湾凹陷沙三段FSST的发现对其沉积解释具有重要地质意义,对研究区进一步的油气勘探开发具有指导意义,也对研究陆相断陷湖盆FSST的形成与发现具有借鉴意义。     

临清坳陷中二叠世古地理恢复

临清坳陷是一个中-新生代的断陷盆地,多期断层活动、多套生储盖组合、多种圈闭类型的地质条件,决定了临清坳陷可形成多类型的油气藏,具有良好的油气勘探前景。以临清坳陷中二叠世沉积地层为主要研究对象,观察钻井取心,详细分析测井标志,建立等时地层格架,基于等时地层格架进行古地理的恢复。研究表明,研究区共划分为2个层序,层序1为河控浅水三角洲环境,层序2过渡为内陆河流环境,对该区的勘探工作及勘探实践具有重要的理论和现实意义。     

The Devonian–Lower Carboniferous succession in Northwest Peninsular Malaysia

A new stratigraphic nomenclature is proposed for the approximately 600 m thick, mainly clastic transitional sequence between the underlying Mempelam Limestone and overlying Kubang Pasu/Singa Formation in northwest Peninsular Malaysia. This sequence represents shallow marine deposits of the continental margin of the Sibumasu Terrane during the Middle Palaeozoic (Devonian–Carboniferous). It is separated into several formations. The Timah Tasoh Formation is an approximately 76 m sequence consisting of 40 m of laminated tentaculitid shales at the base, containing Monograptus yukonensis Jackson and Lenz and Nowakia (Turkestanella) acuaria Alberti, giving an Early Devonian (Pragian–Emsian) age, and about 36 m of rhythmically interbedded, light coloured argillo-arenites. The Chepor Formation is about 90 m thick and consists mainly of thick red mudstone interbedded with sandstone beds, of Middle to Late Devonian age. A new limestone unit is recognized and named the Sanai Limestone, which contains conodonts of Famennian age. The Binjal Formation consists of red and white mudstone interbedded with sandstone beds showing Bouma sequences. The Telaga Jatoh Formation is 9 m thick and consists mainly of radiolarian chert. The Wang Kelian Formation is composed of thick red mudstone beds interbedded with silty sandstone, and contain fossils indicative of an Early Carboniferous (Visean) age. The succession was deposited on the outer shelf, with depositional environments vertically fluctuating from prodelta to basinal marine. The Devonian–Carboniferous boundary is exposed at Hutan Aji and Kampung Guar Jentik, and indicates a major regressive event during the latest Devonian.