本文選題：嘉陵江組　切入點(diǎn)：碳酸鹽巖　出處：《成都理工大學(xué)》2015年碩士論文

【摘要】：下三疊統(tǒng)嘉陵江組作為四川盆地重要的含油氣海相碳酸鹽巖地層,前人針對(duì)其沉積相特征、儲(chǔ)層特征及成巖作用進(jìn)行了大量研究,但多局限于某個(gè)特定的構(gòu)造或地區(qū),而專門針對(duì)川東地區(qū)嘉陵江組碳酸鹽巖巖石學(xué)特征及成巖作用的研究較少或不夠系統(tǒng)深入,不能確切地反映區(qū)內(nèi)的沉積特征,因此,有必要對(duì)川東地區(qū)嘉陵江組碳酸鹽巖巖石學(xué)特征等進(jìn)行深入研究。白廟子剖面位于四川盆地東部重慶市北碚區(qū)境內(nèi),構(gòu)造位置上處于川東高陡構(gòu)造帶西側(cè),華鎣山帚狀構(gòu)造分支觀音峽背斜軸部西翼,該區(qū)構(gòu)造線多以北東向?yàn)橹?沿嘉陵江有連續(xù)的三疊系地層出露地表。本文選取白廟子剖面嘉陵江組第三、四段地層作為研究對(duì)象,結(jié)合野外觀察與室內(nèi)分析,在沉積巖石學(xué)、碳酸鹽巖沉積學(xué)等理論指導(dǎo)下,對(duì)該區(qū)嘉陵江組第三、四段碳酸鹽巖巖石學(xué)特征、沉積相及成巖作用進(jìn)行系統(tǒng)研究。白廟子剖面嘉陵江組第三、四段地層中巖石類型豐富,以碳酸鹽巖為主,其次為鹽溶角礫巖。嘉三段主要發(fā)育灰?guī)r,包括亮晶顆�；�?guī)r,微晶顆粒灰?guī)r,含顆粒微晶灰?guī)r,微晶灰?guī)r等;嘉四段主要發(fā)育白云巖和鹽溶角礫巖,主要包括微晶白云巖,結(jié)晶白云巖及鹽溶角礫巖,還含有微晶灰?guī)r及結(jié)晶灰?guī)r。通過室內(nèi)及鏡下觀察與陰極發(fā)光分析等,詳細(xì)闡述了各類巖石特征。在前人研究基礎(chǔ)上,結(jié)合野外宏觀現(xiàn)象、巖石學(xué)特征以及古生物特征,識(shí)別出研究區(qū)嘉陵江組第三、四段時(shí)期主要發(fā)育開闊臺(tái)地、局限臺(tái)地及臺(tái)地蒸發(fā)巖三種沉積相,進(jìn)一步劃分為臺(tái)內(nèi)洼地、臺(tái)內(nèi)灘、瀉湖、潮坪和蒸發(fā)坪等亞相類型。白廟子剖面嘉陵江組第三、四段碳酸鹽巖經(jīng)歷了復(fù)雜的成巖過程,成巖作用類型較多,包括泥晶化作用,膠結(jié)作用,壓實(shí)和壓溶作用,溶解作用,白云石化作用,重結(jié)晶作用,破裂作用,去石膏化作用等主要成巖作用類型;根據(jù)各種成巖作用特征以及一些特殊的巖石組構(gòu),識(shí)別出研究區(qū)經(jīng)歷了準(zhǔn)同生階段的海水成巖環(huán)境、大氣水成巖環(huán)境、成巖階段的埋藏成巖環(huán)境及表生階段的表生成巖環(huán)境。
[Abstract]:The Lower Triassic Jialingjiang formation is an important petroliferous marine carbonate formation in Sichuan Basin. Previous studies have been carried out on its sedimentary facies, reservoir characteristics and diagenesis, but most of them are confined to a particular structure or region.However, the study of carbonate petrology and diagenesis of Jialingjiang formation in eastern Sichuan is less or less systematic, which can not accurately reflect the sedimentary characteristics in the area.It is necessary to study the petrological characteristics of carbonate rocks of Jialing River formation in East Sichuan.The Baimaozi section is located in Beibei District of Chongqing City in the east of Sichuan Basin, located on the west side of the high-steep structural belt in eastern Sichuan, the west wing of Guanyin isthmus, a branch of Huayingshan broomlike structure, and the tectonic lines in this area are mostly northeastward.Along the Jialing River there are continuous Triassic strata exposed surface.In this paper, the third and fourth formation of Jialing River formation in Baimaozi section is selected as the research object, combined with field observation and laboratory analysis, under the guidance of sedimentary petrology, carbonate sedimentology and other theories, the third Jialing River formation in this area is studied.The petrological characteristics, sedimentary facies and diagenesis of the four-member carbonate rocks were systematically studied.The third and fourth member of Jialingjiang formation in Baimaozi section is rich in rock types, mainly carbonate rock, followed by salt solution breccia.Limestone is mainly developed in the third member of Jia-3, including granular-grained limestone, microgranular limestone, granular-grained limestone and microcrystalline limestone, while dolomite and salt-soluble breccia are mainly developed in the fourth member of Jia-4, which mainly includes microcrystalline dolomite.Crystalline dolomite and salt-soluble breccia, but also microcrystalline limestone and crystalline limestone.Through indoor and microscopic observation and cathodoluminescence analysis, all kinds of rock characteristics are described in detail.On the basis of previous studies, combined with field macroscopic phenomena, petrological characteristics and paleontological characteristics, three sedimentary facies, namely, open platform, limited platform and platform evaporite, were identified in the third and fourth member of Jialing River formation in the study area.The subfacies are further divided into subfacies such as subfacies such as depression, beach, lagoon, tidal flat and evaporation plateau.Carbonate rocks of the third and fourth member of Jialing River formation in Baimaozi section have experienced complex diagenetic processes, and there are many diagenesis types, including mud crystallization, cementation, compaction and pressure solution, dissolution, dolomitization, recrystallization, etc.According to the characteristics of diagenesis and some special rock fabric, the marine diagenetic environment and the atmospheric water diagenetic environment have been identified in the study area.Burial diagenetic environment in diagenetic stage and epigenetic environment in supergene stage.
【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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