云南文山丘北地区上二叠统含煤地层特征

在分析以往地质资料的基础上,通过煤田地质填图、实测剖面测量、槽探等勘查手段,对文山丘北地区地层及构造特征进行分析。区内构造从属于文山巨型旋钮构造,主要发育庄科一密纳复式背斜及尼尼白一笼陶向斜,上二叠统为主要含煤地层,由于沉积环境的差异,在调查区西南部发育龙潭组,其他大部分地区为吴家坪组,龙潭组为主要含煤地层,煤层厚度较小,厚度变化较大,为高灰、高硫、低热值的贫煤。     

海拉尔盆地上库力组重矿物组合特征

海拉尔盆地兴安岭群上库力组自下而上可分出5个重矿物组合：磁黄铁矿-锆石-白钛石-锐钛矿组合,黄铁矿高含量组合,黑云母-白钛石-锆石-钛铁矿组合,菱铁矿-白钛石-黑云母-电气石组合,白钛石-黑云母-菱铁矿-石榴子石组合.不稳定矿物含量高,不同层段呈现高低韵律性变化则与火山-沉积作用强弱交替变化的环境有关.较高的ATi指数反映母岩应为中-酸性火山岩.ZTR指数不高说明重矿物的成熟度较低.由下至上陆源重矿物变少,尤其是上库力组D段（凝灰岩段）,自生黄铁矿占很高的百分比.     

南祁连盆地热水—默勒地区上三叠统可能烃源岩地球化学特征

应用多项分析测试技术，对南祁连盆地热水－默勒地区上三叠统可能烃源岩进行了有机质丰度，类型、成熟度、有机母源和沉积环境等方面的分析。该区上三叠统可能烃源岩为前三角洲和湖沼相的泥质岩沉积，其有机质丰度较高，有机质类型为腐殖型和混合型，主要处于成熟阶段，有机母质主要为高等植物和一定数量的藻菌类低等水生生物的贡献。综合分析认为该套地层具有一定的生烃能力，其中一些层段生烃潜力较大。     

Forced regression and its sedimentary response to continental lacustrine rift basin: A case of the Member 3 of Shahejie Formation in Laizhouwan sag,Bohai Bay Basin

Falling stage systems tract(FSST)is an offlap strata with strong relationship with hydrocarbon exploration,which is driven by relative lake-level fall and developed above the highstand systems tract and below the lowstand systems tract of a new sequence. It has no relationship with sediment supply. Based on the theory of sequence stratigraphy and sedimentology,3D seismic data,drilling core data,and well-logging data were comprehensively analyzed. The study showed that the FSST strata was formed in the Member 3 of Shahejie Formation in the Laizhouwan sag. The FSST can be divided into three units,namely as units P1,P2,and P3 from bottom to top. The P1 is the first unit of progradation downlap the bottom of the FSST. The top of the unit P3 is a sequence boundary exhibits subaerial unconformity. The seismic profile along the source direction is characterized by the low-angle oblique progradation reflection that downstream the center of lake basin from west to east. Incised valleys developed on the top of the FSST perpendicular to the source direction. Gamma-ray logging response is manifested by a series of funnel-shaped complex,indicating that the sedimentary response of the FSST was a cycle of coarsening-upward parasequence sets. Comprehensive studies on core interpretation and well-logging analysis showed that the FSST was a fluvial-delta sedimentary system with slumped fan deposits associated with the delta front. Consequently,the FSST is a common result of relative dry climate and falling of lake level,considering regional tectonic evolution,sediment supply,and paleo-climate change. The discovery of the FSST in the Laizhouwan sag has an important geological significance for the sedimentological interpretation,and it offers a guidance for further oil exploration in the study area. In addition,it also serves as a significant reference for future research on the FSST development and exploration in the continental lacustrine rift basin.     

准噶尔盆地玛湖凹陷风城组页岩油储层岩相划分与类型评价

准噶尔盆地玛湖凹陷风城组页岩油藏是继吉木萨尔凹陷芦草沟组页岩油藏之后的又一重大发现,风城组沉积期玛湖凹陷具有近陆源供给、火山活动频发、气候干旱炎热的特点,为独具特色的盐碱化湖泊沉积环境创造了条件,也是风城组岩性复杂多变的重要原因。火山岩、内源岩、陆源碎屑岩以及多源混积岩纵向频繁叠置,形成米级到厘米级页岩油储层。结合岩性变化特征,以构造样式作为突破口,厘米级尺度岩心观察为基础,高频沉积构造分析为辅助,利用亚离子抛光电镜、能谱测试、荧光分析等多种技术手段对准噶尔盆地玛湖凹陷风城组页岩油储层进行岩性岩相分析,认为玛湖凹陷风城组页岩油储层可划分为4大类（砂砾岩类、火山岩类、混积岩类与内源岩类）、8小类储层。4大类储层储集性能逐渐减弱,其中混积岩类储层因其构造与成分差异可进一步划分为混积页岩、纹层–似纹层状混积泥岩、树根状–网状混积泥岩、雪花–星点状混积泥岩;页理发育情况、云质含量以及其产出样式成为混积岩类储层储集物性差异的重要控制因素。     

鲁西泰山岩群变质枕状玄武岩岩相学和侵入的奥长花岗岩SHRIMP锆石U-Pb年代学

鲁西泰山岩群柳杭岩组中,典型变质枕状玄武岩出露在济南章丘的团员沟村西一带。本文对变质枕状玄武岩的野外地质和岩相学特征,作了详细描述。电子探针分析表明,岩枕内部既有原生斜长石(An>30),又有绿片岩相变质形成的钠长石(An<10)。侵入柳杭岩组的片麻状奥长花岗岩中的岩浆锆石SHRIMP U-Pb年龄为2707±9Ma,它限制了泰山岩群形成时代不晚于2.71Ga。     

河南省济源盆地下侏罗统鞍腰组重力流沉积特征及其构造意义*

在详细野外剖面工作的基础上,通过岩性特征、沉积构造及沉积序列等的系统观察研究,发现济源盆地下侏罗统鞍腰组重力流沉积由滑塌沉积、砂质碎屑流沉积和浊流沉积构成。滑塌沉积以砂岩和泥岩的混杂、岩层的滑动变形以及泥岩呈碎块被卷入砂岩层中为特征;砂质碎屑流沉积常呈厚层块状,颗粒分选和磨圆较差,杂基较多,可见漂浮于层内的石灰岩砾石;常见的浊流沉积分为2种类型: 具有明显正粒序结构的浊流沉积和砂泥岩薄互层的浊流沉积,可用鲍马序列来描述。鞍腰组重力流沉积可划分为3个沉积序列: 序列A记录了滑塌沉积→砂质碎屑流沉积→浊流沉积→深湖沉积的转换过程;序列B表现为砂质碎屑流与浊流沉积的叠覆;序列C由浊流及湖泊沉积构成,并经历了由序列A→序列B→序列C的沉积演化过程。重力流的形成受秦岭造山带于早侏罗世沿三门峡—鲁山—舞阳断裂发生逆冲推覆作用的控制,其沉积演化指示了秦岭造山带造山作用由强到弱的过程。     

基于广域电磁法的页岩气有利区预测——以渝东北巫山地区为例

渝东北巫山地区是重要的页岩气勘探远景区,勘探程度较低.本次研究以岩石物理和测井数据为基础,以广域电磁法为手段,开展该区的页岩气有利区评价.通过对地表样品及井孔电阻率测井资料的分析,揭示研究区目的层富有机质页岩层电阻率表现为明显低阻特征,与上覆下伏地层电性差异明显,表明本区分布的上奥陶统五峰—下志留统龙马溪组富有机质页岩具备开展电法勘探工作的物性条件.在对电磁资料处理解释的基础上,查明了重庆巫山地区“隆凹相间”的构造格局,断裂性质主要为逆断层;目的层上奥陶统五峰组—下志留统龙马溪组富有机质泥页岩连续稳定分布,低阻特征明显,埋深范围在800~4 800m之间.综合考虑目的层页岩电阻率、极化率、埋深等因素,预测出页岩气有利区3个,区内富有机质页岩发育,页岩气勘探前景较好.     

下扬子地区幕府山组陆缘海-台地黑色细粒沉积岩系沉积学和孔隙结构特征

黑色细粒沉积岩系沉积学和孔隙结构研究对于沉积环境恢复、页岩气储层评价和有利储层预测具有重要意义.利用下扬子地区最新完钻的XYZ-1钻井资料,综合钻井岩心、岩石薄片、XRD分析、氩离子-场扫描电镜等手段,开展幕府山组细粒沉积岩系的沉积学和孔隙结构研究.结果表明,幕府山组岩性组成以块状、纹层状深色(碳质)泥岩、浅灰色纹层状...