羌塘盆地隆鄂尼—鄂斯玛地区中侏罗统布曲组岩相古地理研究

发布时间：2018-04-13 08:49

本文选题：羌塘 + 隆鄂尼-鄂斯玛　；参考：《成都理工大学》2017年硕士论文

【摘要】：岩相古地理是研究沉积作用和一系列的盆地演化,分析不同沉积环境下沉积物特征及分布规律,进而分析油气及固体矿产形成的物质基础与条件、油气与固体矿产资源潜力的分布规律,并且进一步指导它们的勘探工作。本论文的题目来自于《羌塘盆地金星湖-隆鄂尼地区油气资源战略调查》项目之“羌塘重点区块调查与评价”子项目,选取子项目中的隆鄂尼-鄂斯玛地区的中侏罗统布曲组为研究对象,本文运用现代沉积学理论,对研究区布曲组进行了详细的岩石、结构、沉积构造、沉积相以及岩相古地理的研究,并在此基础上对中侏罗统布曲组的生油、储层、有利油气远景区进行了简要的分析。羌塘盆地北界为可可西里—金沙江缝合带,南界为班公湖—怒江缝合带,羌塘盆地又被中央隆起带分为南、北两个坳陷。本文研究区属于南羌塘坳陷内的一部分,西起西藏双湖县范围内的隆鄂尼地区,东至安多县附近的鄂斯玛地区,大地坐标为东经88°30′~90°30′,北纬32°30′~33°。根据笔者野外实测剖面、观测剖面、路线追踪调查以及钻井资料,结合前人研究成果的综合分析,取得了以下几点认识。1.隆鄂尼-鄂斯玛地区地层在走向上总体呈东西向延伸,在倾向上具有南北分带的特征。依据地层的岩石组合、生物化石特征等,将研究区地层从北向南可划分为三个地层分区,即北部的蒂让碧错-查郎拉地层分区、中部的毕洛错-昂达尔错-达卓玛地层分区、南部的多玛-色哇-扎曲地层分区。蒂让碧错-查郎拉地层分区主要为上三叠统土门格拉组和新生代地层;毕洛错-昂达尔错-达卓玛地层分区以发育布曲组含油白云岩、颗粒灰岩及少量膏盐岩、褐色及紫色砂岩、粉砂质泥岩等为特征;多玛-色哇-扎曲地层分区发育布曲组暗色微泥晶灰岩夹少量泥页岩。2.研究区中侏罗统布曲组的岩石类型主要以碳酸盐岩为主,碎屑岩比较少。只有在研究区东边的曲巴地贡玛至达卓玛一带发现了砂岩、粉砂岩、泥岩以及多玛-色哇-扎曲地层分区内的曲瑞恰乃剖面、戳润曲剖面等发现了泥岩。碳酸盐岩中主要为灰岩以及白云岩并且大面积分布,灰岩主要为各种颗粒灰岩以及泥晶灰岩;白云岩中可见大量的藻纹层白云岩以及晶粒白云岩;部分地区可见少量的石膏。3.通过对布曲组五条基干剖面各方面综合研究,结合白云岩及顶底板灰岩的包裹体测温和碳氧同位素数据分析,研究区内的沉积相可划分为:潮坪相(包括潮下浅滩相)、泻湖相、陆棚相。4.在多条单剖面沉积相分析基础上,结合数十条路线追踪剖面调查分析和布曲组上(夏里组)、下(曲色色哇组)层位特殊岩类(油页岩、膏盐岩)分布及古地理继承性分析,编制了隆鄂尼-鄂斯玛中侏罗世布曲期的岩相古地理图。首次提出研究区可划分为:隆起剥蚀区、潮坪相带、泻湖相带、潮下浅滩相带和陆棚相带等5个相带。5.在岩相古地理的研究基础上,结合相关资料以及测试分析结果,对隆鄂尼-鄂斯玛地区的生油、储层、有利油气远景区进行了简单的分析。认为古油藏带的生油岩主要分布于泻湖相带,储层主要分布于泻湖相周围的潮坪及潮下浅滩相带,有利油气勘探远景区应为研究区东段的鄂斯玛北地区。
[Abstract]:Paleogeographic evolution of sedimentation and is a series of basin analysis under different sedimentary environment of sediment characteristics and distribution, and then analyzes the material foundation and conditions for oil and gas and solid mineral formation and distribution of oil and gas and solid mineral resource potential, and further guide the exploration work. The title of this paper from "the Qiangtang basin uplift area, Hubei Lake - Venus oil-gas resources investigation project of" key > Qiangtang block the investigation and evaluation of sub project, Middle Jurassic Buqu Formation in selected sub project in Hubei, Hubei smart long area as the research object, this paper uses the modern theory of sedimentology. The study area Buqu group carried out a detailed rock structure, sedimentary structure, sedimentary facies and lithofacies palaeogeography study, and on the basis of the Middle Jurassic Buqu Formation oil source, reservoir, favorable area of oil-gas are briefly Analysis of the North Qiangtang basin. The Hoh Xil Jinsha River suture zone, the southern boundary of the Bangong Lake Nu River suture zone, the Qiangtang basin has been divided into the central uplift belt of South, north two depression. This study area belongs to the southern Qiangtang Basin in the west part, Tibet Shuanghu county within the scope of the lung, Hubei area, near the East Hubei Sima Amdo county area, geodetic coordinates of longitude 88 degrees 30 degrees 30 '' ~90 30 ', north latitude 32 degrees ~33 degrees. According to the measured field profile, profile, route tracking survey and drilling data, combining with the comprehensive analysis of previous research results, made the following.1. Hubei Hubei long Nepal - Smart formation into overall east-west extension, with north-south zone feature in the tendency. According to the formation of rock assemblages of fossils characteristics, the strata in the study area from the north to the South can be divided into three stratigraphic regions, namely north of the pedicle Let bi - wrong Chalangla stratigraphicdivision, central biluocuo - ang Dahl fault Dazhuoma stratigraphic regions, south of Sodom - color Wow - Zhaqu stratigraphicdivision. Tugendhat Bi wrong - Chalangla stratigraphic division is mainly on the three Triassic tumengela group and Cenozoic strata; biluocuo - ang Dahl fault Dazhuoma stratigraphic area by the development of Buqu oil-bearing dolomite, limestone particles and a small amount of salt rock, brown and purple sandstone, silty mudstone and other characteristics; - Wow - Zhaqu Duoma color development stratigraphic division Buqu dark micro micrite shale with minor study area in.2. the Middle Jurassic buquformation rock types mainly in carbonate rocks, clastic rocks in the study area is relatively small. Only the East Qu BA from Dazhuoma to the area found in sandstone, siltstone, mudstone and Duoma - color Wow - Zhaqu formation District Ruiqia is curved section, curved profile stamp run found the mud rock carbon. Acid in salt rock is mainly limestone and dolomite and limestone area distribution, mainly for a variety of grain limestone and micrite dolomite; observed in algal laminated dolomite and crystalline dolomite; some areas showed a few gypsum.3. through sets of five aspects of a comprehensive study on the main profile Buqu, combined with analysis of dolomite and limestone in the top and bottom temperature of fluid inclusions and carbon oxygen isotope data, study of sedimentary zone facies can be divided into: tidal flat facies (including tidal shoal facies), lagoon facies, continental shelf facies.4. in a single section based on the analysis of sedimentary facies, with dozens of routes tracking profile survey and Buqu group (Xia Lizu), under (quse Sewa) special rocks (oil shale, salt rock) distribution and paleogeographic inheritance analysis, Hubei, Hubei developed long - Middle Jurassic Buqu Sima period lithofacies to Daniel. Research is put forward for the first time Area can be divided into: uplift zone, tidal flat facies, lagoon facies, shallow subtidal facies and shelf facies of 5 phase with.5. based on the study of lithofacies paleogeography, combining with the related data and analysis results of Hubei, Hubei long smart oil reservoir area. Prospective areas of favorable oil and gas are briefly analyzed. That source rocks with ancient reservoir mainly distributed in lagoon facies, tidal flat reservoirs mainly distribute in the lagoon and surrounding tidal shoal facies, favorable oil and gas exploration area as the study area in the eastern part of Hubei should be smart north area.

【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P534.52;P512.2

【参考文献】