發(fā)布時(shí)間：2018-07-16 23:10

【摘要】：下三疊統(tǒng)飛仙關(guān)組是四川盆地資源量最大的層系之一。前人陸續(xù)在川東北飛仙關(guān)組鮞粒灘發(fā)現(xiàn)了普光、羅家寨、鐵山坡和渡口河等大中氣田群。這些氣田主要分布在開江-梁平海槽的南緣,對開江-梁平海槽北緣地區(qū)研究較少。本論文選擇位于開江-梁平海槽北緣的南江橋亭剖面,通過實(shí)測野外剖面、野外描述以及樣品采集等室外工作,結(jié)合室內(nèi)顯微觀察、陰極發(fā)光、掃描電鏡等微觀研究方法,以碳酸鹽沉積學(xué)、古生物學(xué)與成巖作用等相關(guān)理論為基礎(chǔ),對橋亭剖面飛仙關(guān)組巖石學(xué)特征以及成巖作用等方面進(jìn)行系統(tǒng)研究。在野外,根據(jù)地層的巖性、結(jié)構(gòu)、構(gòu)造及產(chǎn)狀等特征,判斷出飛仙關(guān)組的頂、底界線,并劃分出飛一段~飛四段。飛一段和飛三段以青灰色-淺灰色碳酸鹽巖為主,飛二段和飛四段以紫紅色泥質(zhì)含量較高的泥灰?guī)r和灰泥巖為主。該剖面下三疊統(tǒng)飛仙關(guān)組碳酸鹽巖主要由碳酸鹽礦物、自生的非碳酸鹽礦物和陸源碎屑礦物組成。碳酸鹽礦物主要是方解石和白云石;自生非碳酸鹽礦物主要為自生石英、黃鐵礦、天青石;陸源碎屑礦物多為石英和長石。研究剖面的巖石類型劃分為灰?guī)r、白云巖和泥質(zhì)巖三大類,并在此基礎(chǔ)上細(xì)分為顆�；�?guī)r、顆粒微晶灰?guī)r、微晶灰?guī)r、微晶白云巖、顆粒白云巖、灰質(zhì)泥巖等亞類。根據(jù)一些特殊的巖石組構(gòu)以及沉積相特征,認(rèn)為研究剖面飛仙關(guān)地層經(jīng)歷了海水潛流環(huán)境、淡水潛流環(huán)境、淡水滲流環(huán)境、埋藏環(huán)境和表生成巖環(huán)境。主要經(jīng)歷的成巖作用有:泥晶化作用、膠結(jié)作用、溶蝕作用、重結(jié)晶作用、壓實(shí)-壓溶作用、破裂與充填作用、自生黃鐵礦以及硅化作用等,并論述了沉積物的成巖演化序列。
[Abstract]:The Feixianguan formation of the Lower Triassic is one of the most abundant strata in Sichuan Basin. The oolitic beach of the Feixianguan formation in northeastern Sichuan has been discovered in succession, such as Puguang, Luojiazhai, Tieshan and Dukouhe gas fields. These gas fields are mainly distributed in the southern margin of the Kaijiang-Liangping trough, but few studies have been done on the northern margin of the Kaijiang-Liangping trough. In this paper, the Nanjiangqiao Pavilion section, located in the northern margin of the Kaijiang-Liangping trough, is selected. Through the outdoor work such as field profile, field description and sample collection, combined with indoor microscopic observation, cathodoluminescence, scanning electron microscope and other micro-research methods, Based on the theories of carbonate sedimentology, paleontology and diagenesis, the petrological characteristics and diagenesis of the Feixianguan formation in Qiaoting section were systematically studied. In the field, according to the lithology, structure, structure and occurrence of the strata, the top and bottom boundaries of the Feixianguan formation are determined, and the Fei-1 ~ Fei4 sections are divided. The main carbonate rocks in the first and third members of Feifei are grey-gray-grayish carbonate rocks, and the marl and lime-mudstone with high content of purplish red mudstone are the main ones in the second and fourth member of Feifei. The carbonate rocks of the Feixianguan formation in the lower Triassic are mainly composed of carbonate minerals, authigenic non-carbonate minerals and continental clastic minerals. The carbonate minerals are mainly calcite and dolomite, the authigenic non-carbonate minerals are mainly authigenic quartz, pyrite and celadite, and the continental clastic minerals are mostly quartz and feldspar. The rock types of the study section are divided into three types: limestone, dolomite and argillaceous rock. On this basis, they are subdivided into granular limestone, granular microcrystalline limestone, microcrystalline dolomite, granular dolomite and lime-mudstone. According to some special rock fabric and sedimentary facies characteristics, it is considered that the Feixianguan strata in the study section have experienced sea water subcurrent environment, fresh water seepage environment, burial environment and epigenetic rock environment. The main diagenesis include mud crystallization, cementation, dissolution, recrystallization, compact-pressure solution, rupture and filling, authigenic pyrite and silicification, etc. The diagenetic evolution sequence of sediments is discussed.
【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】：2015
【分類號(hào)】：P618.13

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本文編號(hào)：2127980