塔里木盆地顺北区块二叠系井漏复杂的分析及对策

顺北区块钻井项目施工中,二叠系的井漏复杂情况较多,漏失量大,易发生再次或多次漏失,严重时导致井壁垮塌掉块卡钻,致使井下复杂情况高发,给钻井工程带来损失,影响了该区块的勘探开发速度。二叠系火成岩发育,地层裂缝发育,地层破裂,钻井时井下复杂主要表现为漏失。针对此问题开展了顺北地区二叠系井漏复杂分析,结合顺北区块施工项目的实际情况以及二叠系地层特点,分析了该区块的二叠系钻进难点,总结了随钻堵漏技术具体的施工措施和不同漏速下的堵漏方案.经过实践验证,该综合防漏堵漏对策能有效减少井漏复杂,提高堵漏效率。     

Uppermost Permian Radiolaria from Southwestern China

ＳｉｎｃｅＮｅｏａｌｂａｉｌｅｌａ（Ｒａｄｉｏｌａｒｉａ）ｗａｓｄｅｓｃｒｉｂｅｄｂｙＴａｋｅ－ｍｕｒａａｎｄＮａｋａｓｅｋｏ（１９８１）,ｔｈｅｏｃｕｒｅｎｃｅｏｆｔｈｉｓｇｅｎｕｓｈａｓｂｅｅｎｒｅｐｏｒｔｅｄｆｒｏｍＥｕｒｏｐｅ,ＮｏｒｔｈＡｍ...     

新疆柯坪、乌什的若干Ting类化石及其地质学意义

根据新疆柯坪，乌什的Ting类化石新材料，结合以往有关Ting类生物地层学及Ting类古地理分布的资料，分析了塔里木地区二叠纪Ting类化石组合特征。研究结果显示，塔里木盆地早二叠世Ting类动物群与我国西南地区同期Ting类动物群面貌非常相似，并具有一些目前仅发现于云南，贵州和广西的地方性种类，表明塔里木板块与华南板块在这一时期应处于相同的纬度，且两者相对位置似应比较接近。但是，这一结论与有关古地磁资料不尽吻合。针对这一问题，结合有关石炭－二叠纪微板块运动及古洋运动方向的研究成果，对塔里木，华南板块早二叠世Ting类动物群相似性产生的原因进行了讨论。     

Triassic stratigraphy,facies and evolution of the Arabian shelf in the northern United Arab Emirates

This study provides a reconstruction of the Late Permian and Triassic depositional history of the Arabian shelf in the northern United Arab Emirates based on facies analysis and foraminiferal biostratigraphy. The presented data show that sedimentation occurred in three major sequences. From the Late Permian to Olenekian carbonates and evaporites were deposited in restricted lagoons and tidal flats. After a hiatus, sedimentation resumed and continued until the Late Ladinian/Carnian, leading to the deposition of a carbonate platform dominated by peritidal dolostones. A period of shelf exposure and erosion, spanning from the Carnian to Norian, was followed by the third major sequence with sedimentation into the Early Jurassic. During this third depositional sequence sedimentation changed from pure carbonate into mixed carbonate–siliciclastic deposits. This transition reflects the global regression of the sea in the Late Triassic (Triasina hantkeni Zone) and the increased erosion of large parts of the Arabian hinterland. A comparison of the evolution of the Arabian shelf in the study area with chronostratigraphic reference schemes for the Arabian Plate reveals remarkable differences in the distribution of Middle and Upper Triassic sequences. These are most likely the result of poor biostratigraphic control on previously studied formations in the region.     

西藏林周旁多地区晚古生代层序地层特征

通过详细的层序地层研究，重建了冈瓦纳大陆北缘石炭－二叠纪层序地层序列，在详细的岩相，准层序研究的基础上，划分出2个二级层序和11个三级层序。研究区的含砾细碎屑岩系滨岩浅水冰筏（或浮水）沉积物经密度流再搬运到深水区的产物。旁多群上部滨岸河流相沉积层序的发现，为石炭－二叠纪冰期研究提供了新的沉积岩石学资料。     

Shrimp U–Pb zircon dating and palynology of bentonitic layers from the Permian Irati Formation, Paraná Basin, Brazil

This paper presents the first SHRIMP zircon age data from bentonitic ash fall layers intercalated with the Irati sedimentary rocks, as well as palynofossils retrieved from the PETROBRAS-Six mine, Paraná State, southern Brazil. The Permian Irati Formation is one the most important oil source horizons within the Paraná Basin, and consists mainly of siltstones, gray claystones, as well as organic-rich claystones intercalated with limestones. Zircon morphology based on cathodoluminescence images includes two different populations: a dominant population of euhedral, prismatic, elongate to acicular grains which are most likely related to an ash fall volcanism; and a population of rounded to large prismatic grains, that were interpreted as detrital grains. SHRIMP analysis performed on the euhedral and prismatic grains revealed an age of ca. 278.4 ± 2.2 Ma (7 points with 95% confidence) interpreted as the crystallization age of the volcanic eruption. Based on this new dating, the Irati Formation should be placed on the Lower Permian (Cisuralian), Artinskian in age, modifying substantially the traditional ages previously attributed to this unit. The palynofossils from this level include key species of the Lueckisporites virkkiae Zone (such as L. virkkiae, L. densicorpus, L. stenotaeniatus, Weylandites lucifer, Alisporites splendens). Typical species of this zone also occur in African and other South American (Argentina) Permian strata, allowing stratigraphical correlations. The origin of the ash falls is not clearly defined. It may be related either to calc-alkaline arc magmatism associated to the Sanrafaelica Orogeny (275 and 250 Ma) or to bimodal volcanic events associated to an early intracontinental rift developed within southwestern Gondwana at ca. 278 My. The dating of this unit is significative to calibrate biostratigraphic schemes along the Paraná Basin, as well as equivalent zones in Gondwana areas, mainly in its Occidental portion.     

内蒙古阿拉善北部好比如地区下石炭统好比如组时代修订及其地质意义

内蒙古阿拉善北部好比如地区地层研究程度较低,好比如组时代久有争议,制约了该区地层层序、沉积建造及构造演化的深入研究。测得好比如地区原定为早石炭世的好比如组碎屑岩LA-ICP-MS锆石U-Pb最小峰值年龄为279Ma,火山岩LA-ICP-MS锆石U-Pb年龄为270.3±2.2Ma,时代应修订为早二叠世空谷期—中二叠世罗德期。结合区域上岩性特征、地层对比及锆石年龄谱对比,将好比如组中段修订为船山统隆林阶—罗甸阶埋汗哈达组(P1-2m),将其上段修订为阳新统祥播阶—冷坞阶阿其德组(P2a)。好比如组的时代修订为研究区晚古生代地层层序、沉积建造及构造演化的研究提供了新的依据。     

山东淄博地区早二叠世地层

<正> 山东淄博含煤盆地大地构造单元属泰山—沂山隆起的北缘,二叠纪地层发育,剖面完整,植物化石丰富。 1.淄博市博山区八陡镇东黑山山西组和下石盒子组剖面 剖面位于八陡镇北约500m处北大沟。 上覆地层 上石盒子组(P1/2)灰、灰绿、紫色等杂色泥岩     

藏南康马地区石炭系—二叠系研究新进展

根据西藏江孜幅和亚东幅 1:2 5万区域地质调查工作的成果 ,阐述了西藏康马地区石炭系—二叠系新的划分方案 ;并根据新采集的腕足类、单体珊瑚和菊石等化石组合 ,讨论了各组的地层时代 ,认为本区二叠纪沉积作用可延续到晚二叠世早期 (吴家坪期 ) ,在原二叠系白定浦组之上建立了一个新组———江浦组 (P3 j)。结合邻区的地层对比 ,分辨出 2个伸展不整合 ;2个Ⅰ类不整合和 3个Ⅱ类不整合。最后初步分析了康马地区杂砾岩的成因 ,认为其与冰期—间冰期冻融环境下的滨岸附近古水道重力流有关。     

山东唐口二叠纪孢粉组合特征

通过对唐口二叠纪孢粉组合的分析研究,建立了该区二叠纪3个孢粉组合带,①Densosporites（套环孢）-Crassispora（厚环孢）组合;②Gulisporites（匙唇三缝孢）-Sinulatisporites（曲环三缝孢）组合;③Anticapipollis（逆沟粉）-Macrotorispora（大一头沉孢）组合。这3个组合带分别反映太原组、山西组、下石盒子组及上石盒子组的孢粉组合面貌,其地质时代分属于早二叠世、中二叠世,晚二叠世早期。     

澜沧江结合带中二叠世达弄岩片的发现及特征

达弄岩片出露于藏东类乌齐县达弄沟及其附近地区,经采样分析测得糜棱岩化绿泥片岩的SIMS锆石U-Pb年龄为272.8±2.4 Ma,表明这套岩石形成于中二叠世。岩石SiO2含量从48.12%到76.93%,它们的原岩可能为基性-中性-酸性的火山岩,岩石系列主体属于高钾钙碱性系列岩石,地球化学分析数据表明在中二叠世,澜沧江...     

藏北申扎地区上二叠统木纠错组的建立及皱纹珊瑚组合

在申扎县城东南木纠错南东岸附近发现一套巨厚的以白云岩、白云质灰岩为主组成的岩系,厚达2348m。该岩系整合覆于下二叠统下拉组之上,并于其底部发现中国南方晚二叠世早期珊瑚动物群中的重要分子WaagenophyllumindicumcrassiseptatumWu和LiangshanophyllumstreptoseptatumWang两种,与其共生的还有Lobatophyllumzakan-genseWu和WaagenophyllummegacolumetumWu,它们共同组成一个晚二叠世早期特有的皱纹珊瑚动物组合,命名为Waagenophyllum-Liangshanophyllum-Lobatophyllum组合。将含有这一珊瑚化石组合的以白云岩、白云质灰岩为主的岩系另建立新组———木纠错组,该组在层位上相当于中国南方上二叠统的吴家坪组。     

中国二叠纪生物礁的研究现状及新进展

对我国二叠纪生物礁的类型、演化规律及研究方法进行了系统的总结。按造礁生物种类的不同可将二叠纪生物礁分为珊瑚礁和海绵礁;按古地理位置的不同可分为岸礁、台地边缘礁及点礁。生物礁研究的方法包括传统方法、结合成岩作用的方法、定量地层学方法、地球化学方法及地球物理方法等。最后对东昆仑地区最新发现的生物礁作了简单的介绍。     

Using sedimentology to address the marine or continental origin of the Permian Hutchinson Salt Member of Kansas

The Permian Hutchinson Salt Member of the Wellington Formation of the Sumner Group of Kansas (USA) has multiple scientific and industrial uses. Although this member is highly utilized, there has not been a sedimentological study on these rocks in over 50 years, and no study has investigated the full thickness of this member. Past publications have inferred a marine origin as the depositional environment. Here, this marine interpretation is challenged. The goals of this study are to fully document sedimentological and stratigraphic characteristics of the Permian Hutchinson Salt Member in the Atomic Energy Commission Test Hole 2 core from Rice County, Kansas. This study documents colour, mineralogy, sedimentary textures, sedimentary structures, diagenetic features and stratigraphic contacts in core slab and thin sections. The Hutchinson Salt Member is composed of five lithologies: bedded halite, siliciclastic mudstone, displacive halite, bedded gypsum/anhydrite and displacive gypsum/anhydrite. These lithologies formed in shallow surface brines and mudflats that underwent periods of flooding, evapoconcentration and desiccation. Of note are the paucity of carbonates, lack of marine-diagnostic fossils, absence of characteristic marine minerals and lithofacies, and the stratigraphic context of the Hutchinson with associated continental deposits. The Hutchinson Salt Member was most likely deposited in an arid continental setting. This new interpretation offers a refined view of Pangaea during the middle Permian time.     

南盘江地区二叠纪生物礁造架生物的初步研究

在云南东南部、贵州西南部和广西西北部毗邻的南盘江地区,广泛地发育着二叠系生物礁。迄今为止,在本区已发现了42个生物礁露头区。在古代生物礁的研究中,最重要的是研究每个礁体中的造架生物。通过对本区15个礁体的详细研究,这些礁体中的造架生物主要是:串管海绵、纤维海绵、水螅和硬海绵类;次要生物为苔藓虫、管壳石等。在串管海绵亚目中,已发现了塞巴加斯科、瓜达卢佩科、泡腔科、隐腔科和内孢粒腔科的12个属,纤维海绵亚目中有小领针属和盔海绵属。本文中介绍3个新种、2个比较种、3个种、3个未定种。     

西天山阿沙勒河中上游二叠系的发现及环境分析

近年在西天山阿沙勒河中上游的博罗霍洛山地层小区新发现陆相二叠系,分布面积较大,其岩石组合及岩相特征与区域上的中下二叠统乌郎组相同,并采获二叠纪孢粉化石,这是该地区二叠纪地层古生物工作取得的新进展,具有重要的研究意义。     

甘肃公婆泉地区志留纪弧盆体系前寒武纪基底的发现及找矿意义

公婆泉地区为志留纪沟、弧、盆发育地区，为铜和多金属有利成矿带。作者通过野外和室内综合研究，对前人所确定的下志留统勒巴泉群、尖山地区中、上志留统“公婆泉群”、马鬃山主峰东侧“下石炭统、下二叠统”等变质岩系分别作了Ｓｍ－Ｎｄ、Ａｒ－Ａｒ、Ｒｂ－Ｓｒ法测年研究，获得新数据。其时代为：尖山地区“公婆泉群”变质火山岩时代为震旦纪至早古生代；勒巴泉地区勒巴泉群、马鬃山主峰东侧“下右炭统、下二叠统”变质岩时代分     

广东二叠纪区域构造背景及聚煤古构造因素

根据板块活动论以及华南区域构造研究的最近进展，分析了广东二叠纪的区域构造背景及聚煤古构造因素。认为广东二叠纪煤系沉积在华南板块上，古特提斯的演化（开合律）、华南板块上茅口期的裂陷作用以及中、晚二叠世之交的钦州运动决定和影响着广东二叠纪的聚煤作用。     

重塑下哨地区二叠纪岩相古地理

下哨地区处于贵州三叠纪深水槽谷北缘转折部位，岩相古地理变化大。该地区的二叠系主要顺周边展布，中部因三叠系大面积覆盖，仅见下哨与回龙两处露头且出露不全，限制了早期地层的研究深度，尤以下哨二叠系出露区以往的工作程度最低，客观地强化了研究区中部原划二叠纪岩相古地理分布范围的波动性。近期在下哨一带实测的最新资料显示出上二叠统龙潭组含煤岩系连续沉积于下二叠统岜仙组碎屑岩系之上的异相叠积关系，具有区域地层研究意义。据此，本文通过对下哨地区早二叠世茅口期与晚二叠世岩相变化的再认识，重新恢复其古地理格局，并首次提出上二叠统龙潭－长兴组与领组相变的新观念，使晚二叠世深水槽谷相碎屑岩的物源解释更趋合理。     

A new permian bivalve zonal scale of Northeastern Asia. Article 2: Correlation problems

The problems of the intra- and regional correlation of Permian sections of Northeastern Asia are considered based on a new zonal biostratigraphic bivalve scale. The interregional correlation was performed for the Permian deposits in the eastern part of the Boreal Superrealm and some adjacent regions. The possibilities and problems of bivalve-based correlation of Permian sediments in extraboreal regions are discussed.