川西南地區(qū)燈影組微生物碳酸鹽巖沉積環(huán)境分析
發(fā)布時間：2019-06-24 22:51
【摘要】：川西南地區(qū)位于中上揚子地臺西南緣,該區(qū)燈影組發(fā)育了一套微生物碳酸鹽巖沉積巖層。在野外實測剖面、鉆井巖心觀察和顯微薄片鑒定的基礎上,通過對先鋒剖面及金石1井的地層特征、巖石學特征的研究,結合前人的研究成果,將該區(qū)燈影組地層劃分為53層(包括0層):燈一段劃分18層,以泥-粉晶白云巖最為發(fā)育;燈二段劃分21層,以疊層石白云巖和豹斑狀凝塊石白云巖為主;燈三段劃分14層,以層紋石白云巖和豹斑狀凝塊石白云巖為主。在地層劃分的基礎上,將研究區(qū)燈影組巖石類型劃分為貧-非微生物白云巖類和微生物白云巖類兩個大類,其中貧-非微生物白云巖類劃分為顆粒白云巖和晶粒白云巖兩類。根據(jù)微生物白云巖類的成分、結構和構造以及微生物含量的多少,微生物的生態(tài)學特征的差異,以及它們所提供給沉積物的物質組分、結構構造的不同,本文將區(qū)內燈影組微生物白云巖類又劃分為10種類型,分別為:水平狀紋層疊層石白云巖、波狀紋層疊層石白云巖、丘狀紋層疊層石白云巖、柱狀紋層疊層石白云巖、錐狀紋層疊層石白云巖、不規(guī)則狀紋層疊層石白云巖、層紋石白云巖、豹斑狀凝塊石白云巖、散碎狀凝塊/砂屑微生物白云巖和核形石白云巖等。通過分析研究區(qū)燈影組微生物碳酸鹽巖的C、O同位素特征、Mn2+、Fe2+微量元素絕對含量特征及陰極發(fā)光所反映的Mn2+、Fe2+相對含量,來判斷其沉積環(huán)境。本文采用δ13C-Z值圖解的方法對研究區(qū)微生物碳酸鹽巖的沉積環(huán)境進行判斷,認識到研究區(qū)微生物碳酸鹽巖δ13C-Z值點處于海水成巖環(huán)境區(qū)間,而且研究區(qū)微生物碳酸鹽巖中更富δ13C,Z值更高,其Z值在127.25~134.75之間,明顯120,說明研究區(qū)內微生物碳酸鹽巖沉積時的鹽度很高,其沉積環(huán)境為海水(潮坪)環(huán)境。研究區(qū)微生物碳酸鹽巖的陰極發(fā)光幾乎都發(fā)光,且多為橙黃-橙紅色,是因為Mn2+含量足,而Fe2+含量較少,并且Mn2+、Fe2+微量元素的絕對含量也證實這一結果,這反映了該區(qū)微生物碳酸鹽巖的沉積環(huán)境中少有大氣水補給Fe2+,其沉積環(huán)境應屬于海水(潮坪)沉積環(huán)境。研究區(qū)燈影組微生物白云巖中主要發(fā)育疊層構造、凝塊結構、微生物碎屑結構和核形石結構,這些組構特征是作為該區(qū)微生物白云巖沉積相識別及劃分的重要標志。根據(jù)地球化學特征分析、陰極發(fā)光特征分析及室內微相分析的結果,對研究區(qū)燈影組地層進行了沉積相、亞相和微相的劃分。研究區(qū)燈影組微生物碳酸鹽巖地層中可識別出潮上帶、潮間上帶低能帶、潮間下帶高能帶、潮下瀉湖、潮下障壁灘、潮下低能帶等6種沉積微相。6種沉積微相在時空上的有序組合,構成了研究區(qū)燈影組碳酸鹽巖局限臺地內的潮坪亞相。根據(jù)沉積相在縱向和橫向上的變化,建立了該區(qū)燈影組微生物碳酸鹽巖的沉積模式,相對海平面的海退-海侵-海退-海侵沉積旋回很好的控制了沉積相模式的演化,為該區(qū)的地質研究和油氣勘探提供了重要的基礎地質資料。
[Abstract]:The southwest of the upper Yangtze platform is located in the southwest of Sichuan, and a set of micro-microbial carbonate sedimentary rock is developed in the Dengying Formation. On the basis of field survey section, drilling core observation and micro-sheet identification, the formation characteristics and petrological characteristics of the pioneer section and the Jinshi 1 well are studied, and the formation of the Dengying Formation in this area is divided into 53 layers (including 0 layers) in combination with the previous research results. The first segment of the lamp is divided into 18 layers, and is the most developed by the mud-powder-crystal dolostone; the two sections of the lamp are divided into 21 layers, and the stone dolostone and the leopard-shaped aggregate stone dolomite are mainly divided into three sections; and the three sections of the lamp are divided into 14 layers, and the layer-like stone dolostone and the leopard-shaped aggregate stone-stone dolomite are the main. On the basis of the formation division, the types of rock types in the study area are divided into two broad categories of lean-non-microbial dolomite and microorganism dolostone, among which the lean-non-microbial dolostone is divided into two types: the granular dolostone and the grain dolomite. depending on the composition, structure and construction of the microbial dolomite, as well as the amount of microbial content, the difference in the ecological characteristics of the microorganism, and the material composition provided to the deposit, the structure of the structure is different, In this paper, the microbial dolostone in the light-shadow group in the region is divided into 10 types, namely, the horizontal-form layer-layer-layer-layer-layer-layer-layer stone dolostone, the wave-like-pattern-layer-layer-layer-layer-layer stone dolomite, the papular-like layer-layer-layer-layer-layer-layer stone dolostone, the columnar-type layer-layer-layer-layer-layer stone dolomite, the cone-shaped layer-layer-layer-layer-layer stone dolomite, Irregular laminas, stone dolostone, layer-like stone dolostone, leopard-like-shaped stone-stone dolostone, loose-broken clot/ sand-debris microbial dolomite and nuclear-shaped stone dolomite, etc. The sedimentary environment was determined by analyzing the characteristics of C, O isotope, the absolute content of Mn2 +, Fe 2 + and the relative content of Mn2 + and Fe 2 + as reflected by the cathode luminescence. In this paper, the sedimentary environment of the micro-organism carbonate in the study area is judged by using the method illustrated in the Figure 13C-Z value, and it is recognized that the 13C-Z value point of the microbial carbonate rock in the study area is in the sea-water diagenetic environment, and the more rich 13C and Z value in the microbial carbonate in the study area are higher. The Z-value is between 127.25 and 134.75. It is clear that the salinity of the micro-organism carbonate in the study area is high, and its sedimentary environment is the sea water (tidal flat) environment. The cathode luminescence of the micro-organism carbonate in the study area is almost all light, and is orange-orange-red, because the content of Mn2 + is sufficient, and the content of Fe2 + is less, and the absolute content of Mn2 + and Fe 2 + trace elements also confirms this result. This reflects that the sedimentary environment of the micro-organism carbonate in this area is rare for the supply of Fe 2 + in the atmosphere, and its sedimentary environment should belong to the sedimentary environment of the sea water (tidal flat). In the study area, the main developmental stack structure, the clot structure, the microbial debris structure and the core-shaped stone structure in the microbial dolomite of the Dengying Formation of the study area are the important marks for the identification and division of the sedimentary facies of the microbial dolomite in the area. According to the geochemical characteristics, the characteristics of the cathode luminescence and the results of the indoor microfacies analysis, the sedimentary facies, subfacies and microfacies are divided into the formation of the Dengying Formation in the study area. In the study area,6 sedimentary microfacies such as the upper belt, the upper belt, the high band, the lower lagoon, the lower barrier beach and the lower energy band can be identified in the micro-organism carbonate formation of the Dengying Formation of the study area.6 sedimentary microfacies are in an ordered combination in time and space. The tidal subfacies in the limited platform of the carbonate of the Dengying Formation in the study area are formed. According to the change of the sedimentary facies in the longitudinal direction and the transverse direction, the sedimentary model of the micro-organism carbonate in the Dengying Formation in this area is established, and the evolution of the sedimentary facies model is well controlled by the sea-back-transgression-transgression-transgressive sedimentary cycle of the sea level. It provides important basic geological data for geological research and oil and gas exploration in this area.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13
本文編號：2505431
[Abstract]:The southwest of the upper Yangtze platform is located in the southwest of Sichuan, and a set of micro-microbial carbonate sedimentary rock is developed in the Dengying Formation. On the basis of field survey section, drilling core observation and micro-sheet identification, the formation characteristics and petrological characteristics of the pioneer section and the Jinshi 1 well are studied, and the formation of the Dengying Formation in this area is divided into 53 layers (including 0 layers) in combination with the previous research results. The first segment of the lamp is divided into 18 layers, and is the most developed by the mud-powder-crystal dolostone; the two sections of the lamp are divided into 21 layers, and the stone dolostone and the leopard-shaped aggregate stone dolomite are mainly divided into three sections; and the three sections of the lamp are divided into 14 layers, and the layer-like stone dolostone and the leopard-shaped aggregate stone-stone dolomite are the main. On the basis of the formation division, the types of rock types in the study area are divided into two broad categories of lean-non-microbial dolomite and microorganism dolostone, among which the lean-non-microbial dolostone is divided into two types: the granular dolostone and the grain dolomite. depending on the composition, structure and construction of the microbial dolomite, as well as the amount of microbial content, the difference in the ecological characteristics of the microorganism, and the material composition provided to the deposit, the structure of the structure is different, In this paper, the microbial dolostone in the light-shadow group in the region is divided into 10 types, namely, the horizontal-form layer-layer-layer-layer-layer-layer-layer stone dolostone, the wave-like-pattern-layer-layer-layer-layer-layer stone dolomite, the papular-like layer-layer-layer-layer-layer-layer stone dolostone, the columnar-type layer-layer-layer-layer-layer stone dolomite, the cone-shaped layer-layer-layer-layer-layer stone dolomite, Irregular laminas, stone dolostone, layer-like stone dolostone, leopard-like-shaped stone-stone dolostone, loose-broken clot/ sand-debris microbial dolomite and nuclear-shaped stone dolomite, etc. The sedimentary environment was determined by analyzing the characteristics of C, O isotope, the absolute content of Mn2 +, Fe 2 + and the relative content of Mn2 + and Fe 2 + as reflected by the cathode luminescence. In this paper, the sedimentary environment of the micro-organism carbonate in the study area is judged by using the method illustrated in the Figure 13C-Z value, and it is recognized that the 13C-Z value point of the microbial carbonate rock in the study area is in the sea-water diagenetic environment, and the more rich 13C and Z value in the microbial carbonate in the study area are higher. The Z-value is between 127.25 and 134.75. It is clear that the salinity of the micro-organism carbonate in the study area is high, and its sedimentary environment is the sea water (tidal flat) environment. The cathode luminescence of the micro-organism carbonate in the study area is almost all light, and is orange-orange-red, because the content of Mn2 + is sufficient, and the content of Fe2 + is less, and the absolute content of Mn2 + and Fe 2 + trace elements also confirms this result. This reflects that the sedimentary environment of the micro-organism carbonate in this area is rare for the supply of Fe 2 + in the atmosphere, and its sedimentary environment should belong to the sedimentary environment of the sea water (tidal flat). In the study area, the main developmental stack structure, the clot structure, the microbial debris structure and the core-shaped stone structure in the microbial dolomite of the Dengying Formation of the study area are the important marks for the identification and division of the sedimentary facies of the microbial dolomite in the area. According to the geochemical characteristics, the characteristics of the cathode luminescence and the results of the indoor microfacies analysis, the sedimentary facies, subfacies and microfacies are divided into the formation of the Dengying Formation in the study area. In the study area,6 sedimentary microfacies such as the upper belt, the upper belt, the high band, the lower lagoon, the lower barrier beach and the lower energy band can be identified in the micro-organism carbonate formation of the Dengying Formation of the study area.6 sedimentary microfacies are in an ordered combination in time and space. The tidal subfacies in the limited platform of the carbonate of the Dengying Formation in the study area are formed. According to the change of the sedimentary facies in the longitudinal direction and the transverse direction, the sedimentary model of the micro-organism carbonate in the Dengying Formation in this area is established, and the evolution of the sedimentary facies model is well controlled by the sea-back-transgression-transgression-transgressive sedimentary cycle of the sea level. It provides important basic geological data for geological research and oil and gas exploration in this area.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13
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