本文選題：物源分析　切入點(diǎn)：頭屯河組　出處：《成都理工大學(xué)》2017年碩士論文

【摘要】：準(zhǔn)噶爾盆地東部阜康東環(huán)帶北部地區(qū)(以下簡(jiǎn)稱阜北地區(qū))侏羅系主要屬湖泊-三角洲沉積體系,中侏羅統(tǒng)屯河組近年來(lái)已成為新疆油田重要的勘探層系之一,受到了人們的普遍關(guān)注。雖然諸多學(xué)者對(duì)準(zhǔn)噶爾盆地侏羅系物源及沉積相獲得了較多認(rèn)識(shí),但這些認(rèn)識(shí)大多基于整個(gè)準(zhǔn)噶爾盆地,且層位主要集中在三工河組和八道灣組,對(duì)于剝蝕比較嚴(yán)重的頭屯河組的物源分析則較少,針對(duì)阜康東環(huán)帶侏羅系頭屯河組物源的研究則更少。本文在前人已有成果基礎(chǔ)上,結(jié)合鉆井巖心觀察,并運(yùn)用砂巖碎屑組分定量統(tǒng)計(jì)、重礦物組合及其指數(shù)分析、陰極發(fā)光分析、合微量元素和稀土元素沉積地球化學(xué)分析,以及針對(duì)阜北地區(qū)頭屯河組沉積特征綜合研究,試圖弄清頭屯河組主物源方向、母巖性質(zhì)以及物源區(qū)構(gòu)造背景,為深化該地區(qū)地質(zhì)認(rèn)識(shí)及指導(dǎo)下步油氣勘探提供支撐。依據(jù)野外露頭、鉆井巖心、測(cè)井和地震資料綜合分析,認(rèn)為準(zhǔn)噶爾盆地東部阜北地區(qū)頭屯河組屬辮狀河三角洲沉積相,并劃分出三角洲平原、三角洲前緣和前三角洲亞相和11類沉積微相,沉積充填序列呈現(xiàn)出粗-細(xì)-粗-細(xì)的變化趨勢(shì)。沉積相帶的平面展布具有從北東向南西由辮狀河三角洲向湖泊演變的沉積規(guī)律。阜北地區(qū)中侏羅統(tǒng)頭屯河組砂巖以長(zhǎng)石巖屑砂巖為主,其次為巖屑砂巖,碎屑組分中石英主要由單晶石英組成,同時(shí)含有部分變質(zhì)石英巖屑和沉積巖的燧石巖屑;長(zhǎng)石以鉀長(zhǎng)石為主,斜長(zhǎng)石較少;巖漿巖巖屑以霏細(xì)巖、玄武巖和安山巖等噴出巖巖屑為主,變質(zhì)巖巖屑以千枚巖為主,少量片巖巖屑,沉積巖巖屑主要以泥巖巖屑和云母等為主。重礦物組合特征、Dickinson碎屑組分投點(diǎn)圖、石英的陰極發(fā)光以及微量元素和稀土元素沉積地球化學(xué)結(jié)果顯示,頭屯河組的物源方向很可能為北東向,最有可能是來(lái)自北東向的克拉美麗山源區(qū),母巖主要以中酸性巖漿巖為主;頭屯河組源區(qū)的構(gòu)造背景主要為巖漿島弧,且主要集中在過(guò)渡弧區(qū)和未切割島弧區(qū),并含有火山碎屑及火山-深成巖屑砂巖成分;大地構(gòu)造環(huán)境主要屬被動(dòng)大陸(島弧)邊緣和大洋島弧源區(qū)構(gòu)造背景。
[Abstract]:Jurassic mainly belongs to lacustrine delta sedimentary system in the northern area of eastern Fukang ring belt in eastern Junggar Basin. Tunhe formation of Middle Jurassic has become one of the important exploration strata in Xinjiang Oilfield in recent years.Has received the general attention of the people.Although many scholars have gained more knowledge of Jurassic provenance and sedimentary facies in Junggar Basin, most of these understandings are based on the whole Junggar Basin, and the horizon is mainly concentrated in Sangonghe formation and Badaowan formation.There is less material source analysis for Toutunhe formation with serious denudation, much less for Jurassic Toutunhe formation in the eastern ring belt of Fukang.On the basis of previous achievements, combined with core observation, quantitative statistics of sandstone clastic components, heavy mineral assemblage and its index analysis, cathodoluminescence analysis, trace elements and rare earth element sedimentary geochemistry analysis are used in this paper.Aiming at the comprehensive study of sedimentary characteristics of Toutunhe formation in Fubei area, this paper attempts to clarify the direction of main provenance, the nature of parent rock and the tectonic background of provenance area, which provides support for deepening geological understanding and guiding oil and gas exploration in the next step.Based on the comprehensive analysis of outcrop, drilling core, logging and seismic data, it is considered that the Toutunhe formation in the eastern Fubei area of Junggar Basin belongs to braided river delta sedimentary facies and is divided into delta plain.The sedimentary filling sequence of delta front, prodelta subfacies and 11 types of sedimentary microfacies shows a trend of coarse-fine-coarse-fine variation.The plane distribution of sedimentary facies belt is characterized by the evolution from braided river delta to lake from north east to south west.Feldspar is dominated by potash feldspar, while plagioclase is less, magmatic debris is dominated by feldspar, basalt and andesite, metamorphic lithoclast is dominated by phyllite and a small amount of schist.Sedimentary lithoclasts are mainly mudstone and mica.The heavy mineral assemblage features of Dickinson clastic composition, cathodoluminescence of quartz, trace elements and REE sedimentary geochemistry indicate that the source direction of the Toutunhe formation is likely to be NE.The source rocks are mainly intermediate-acid magmatic rocks, the tectonic setting of the source area of Toutunhe formation is mainly magmatic island arc, and it is mainly concentrated in transitional arc region and uncut island arc area.The tectonic environment is mainly passive continental (island arc) margin and oceanic island arc source tectonic setting.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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