1.DISCOVERY OF CAMBRIAN-ORDOVICIAN COCCOLITH FOSSILS AND THEIR OIL-GENERATING SIGNIFICANCE IN TADONG WELL Ⅰ AND YINGMAI WELL Ⅰ OF THE TALIMU BASIN
DISCOVERY OF CAMBRIAN－ORDOVICIAN COCCOLITH FOSSILS AND THEIR OIL－GENERATING SIGNIFICANCE IN TADONG WELL Ⅰ AND YINGMAI WELL Ⅰ OF THE TALIMU BASIN
2.From the Cambrian to the early Middle Ordovician, the Cambrian radiolaria and the Early Ordovician conodonts of the Erlangping trough in the northern part of EQM, and the Cambrian trilobites and Early Ordovician conodonts as well as cephalopods of the northern Xichuan shelf in the southern part of EQM belonged to the South China Province, while the Cambrian trilobites and the Early Ordovician conodonts of the southern Xichuan shelf belonged to the South China Province with some elements of the North China Province.
在寒武纪至中奥陶世早期，东秦岭北部二郎坪海槽的寒武纪放射虫和早奥陶世牙形石与东秦岭南部浙川陆棚北部的寒武纪三叶虫、早奥陶世牙形石和头足类属华南生物省，而浙川陆棚南部的寒武纪三叶虫和早奥陶世牙形石属于华南生物省，兼有华北生物省分子。
3.On the basis of tectonic setting we can define five distinct environments in which volcanic magmas may be generated:1.Late Proterozoic-Cambrian continental rift volcanism,2.Late Cambrian-Early Ordovician mid-ocean ridge and ocean island volcanism,3. Ordovician island arc volcanism,4.Middle-Late Ordovician back-arc basin vocanism,5.Late Ordovician-Silurian volcanism during closing of ocean basin.
经确定有如下5种特定的火山岩浆产生环境：（1）元古代末－寒武纪大陆裂谷型火山作用，（2）寒武纪末－早奥陶世洋脊－洋岛型火山作用，（3）奥陶纪岛弧火山作用，（4）中－晚奥陶世弧后盆地火山作用，（5）晚奥陶世－志留纪海盆闭合期火山作用。
4.In the StageⅠ, hydrocarbon in the Cambrian-Lower Ordovician source rocks was migrated and emplaced into Ordovician and Silurian traps in Fracture Belt 1 and the North Slope Belt during Silurian period In the Stage Ⅱ, hydrocarbon in the Middle-Lower Ordovician source rocks was migrated and emplaced into the primary Ordovician and Silurian traps once more or into late traps to form new reservoirs during Yanshanian-Himalayan orogenic period.
第Ⅰ成藏期形成的油藏有两个特征 :在塔中Ⅰ号断裂带、北部斜坡带油气注入奥陶系及志留系圈闭中 ,形成原生油气藏 ; 构造高部位 (如中央断垒带 )的油气藏在后期构造运动中遭受破坏。
5.The available reservoirs of Ordovician carbonate in central Tarim can be classified into 3 types as epidiagenetic paleo-karst reservoir,burial karst reservoir and interlayer dolomite reservoir,and the epidiagenetic paleo-karst reservoir can be subdivided into 2 types as epidiagenetic karst reservoir formed later than Ordovician(EKR-1) and epidiagenetic karst reservoir formed from late Middle Ordovician to early Late Ordovician(Llandeilo to early Caradoc)(EKR-2).
将塔中地区奥陶系碳酸盐岩有效储层分为古潜山岩溶储层、埋藏溶蚀储层及内幕白云岩储层3大类,其中古潜山岩溶储层又可分为志留纪后古潜山储层及中晚奥陶世古潜山储层2类。
6.Tarim basin underwent the ramp carbonate platform of early-middle Cambrian,rimmed shelf carbonate platform of late Cambrian-early middle Ordovician,isolated carbonate platform in the early period of late Ordovician,and drowned carbonate platform in the middle-late period of late Ordovician.
从寒武纪到奥陶纪,塔里木盆地经历了早、中寒武世缓坡型碳酸盐岩台地,晚寒武世—早中奥陶世弱镶边斜坡型碳酸盐岩台地,晚奥陶世早期孤立型碳酸盐岩台地和晚奥陶世中晚期淹没型碳酸盐岩台地四种不同台地结构型式的演变。
7.The Ordovician in northern Shaanxi constitutes a large marine evaporite basin. In the Early Ordovician Majiagou Formation, on the east side of the basin, the authors have discovered such potash salts as sylvite, carnallite and rinneite, which is the first discovery of potash salts in the Ordovician in the world.
陕北奥陶系是一个大型海相蒸发岩盆地,笔者在盆地东侧下奥陶统马家沟组,发现了钾石盐、光卤石等钾盐矿物,这是世界上首次在奥陶系发现钾盐。
8.Combined with such as the seismic, well-logging data, core, FMI imaging logging data, the paper evaluates the reservoir of Ordovician in Ka 1 block, and designates tow type reservoir rock: dolomite, limestone and four type reservoir:dissolution-void reservoir, dispersive fracture reservoir, fracture-void reservoir, vertical fracture reservoir. Thereinto, dolomite of middle-lower Ordovician reveals be mostly fracture reservoir, limestone of upper Ordovician reveals be mostly dissolution reservoir.
卡1区块的主要储集岩为石灰岩与白云岩,储层主要有四种类型:溶蚀-孔洞型储层、分散溶洞型储层、裂缝—孔洞型储层、高角度裂缝型储层,中下奥陶统白云岩主要为溶蚀型储层,而上奥陶统石灰岩则主要发育裂缝型储层。
9.Guchengxu uplift located in the east side of central uplift in Tarim basin indicates that the Ordovician strata are complete,and the grain limestone and porous-type reservoirs in Yijianfang formation of Middle Ordovician-Yingshan formation of Lower Ordovician are newly discovered in this area.
位于塔里木盆地中央隆起带东段的古城墟隆起,奥陶系齐全,新发现中奥陶统一间房组-下奥陶统鹰山组颗粒灰岩孔隙型储集层。
10.Through field investigation, the most complete Paleozoic section in northern Tibet was measured in the Zakang area, Xainza County, where the Early Ordovician Arenigian graptolite fauna was discovered. This fauna is the oldest one at the known lowest horizon in Tibet, so the authors establish the Lower Ordovician Zakang Formation (O1z).
测制了目前藏北地区最为完整的申扎扎扛古生界剖面,发现了早奥陶世阿雷尼格期的笔石动物群,确定该动物群属于西藏已知层位最低、时代最早的动物群,建立了下奥陶统扎扛组(O1z)。
