本文選題：南江橋亭 + 中二疊統(tǒng)棲霞組�。� 參考：《成都理工大學》2015年碩士論文

【摘要】：白云巖儲層是碳酸鹽巖的主要儲層類型之一,中石油西南油氣田分公司目前在四川盆地中二疊統(tǒng)已經(jīng)發(fā)現(xiàn)了具有工業(yè)價值的白云巖儲層氣藏,充分顯示了這些白云巖儲層在油氣勘探中的良好前景。前人對于四川盆地棲霞組地層的古生物特征、沉積相、層序地層以及成巖作用等方面都開展了大量的工作并取得了豐碩的研究成果,但關(guān)于白云巖的研究成果更多的集中在四川盆地西部,川東北地區(qū)棲霞組地層中有關(guān)白云巖的研究顯得相對薄弱。因此,本文以川東北南江橋亭中二疊統(tǒng)棲霞組白云巖為研究對象,通過野外露頭觀察、薄片鑒定、陰極發(fā)光特征、掃描電鏡和能譜分析、X衍射分析等方法,研究了巖石學特征、白云石有序度特征及影響因素、成巖流體性質(zhì)等,并結(jié)合前人關(guān)于川東北地區(qū)地質(zhì)背景、發(fā)育地層、沉積相、埋藏史和熱史等研究,對南江橋亭棲霞組白云巖成因進行一些有價值的探討。通過對比研究南江橋亭剖面、廣元長江溝剖面以及吳家1井、礦2井、漢深1井棲霞組白云石有序度得出:①白云石的有序度與其結(jié)晶程度有關(guān),晶體相對較大(如粗-中晶)的白云石有序度好于晶體相對較小(如細晶)白云石;②白云石有序度與碳酸鹽巖白云巖化程度有關(guān),白云巖化越徹底,白云石的有序度越高;③白云石有序度與Fe2+、Mn2+、Sr2+離子含量有關(guān),Fe2+、Mn2+、Sr2+離子含量與白云石有序度呈負相關(guān)關(guān)系。3口井下樣品白云巖化比南江橋亭和廣元長江溝剖面更徹底,白云石有序度更高;其中西南部的漢深1井白云石有序度最高,東北部的南江橋亭剖面白云石有序度最低,這種變化趨勢也反映了熱事件的影響,離熱源(峨眉玄武巖)越遠,白云巖化作用越弱。棲霞組白云巖化作用不徹底,主要發(fā)育的是灰質(zhì)白云巖。白云巖不具原始結(jié)構(gòu),為中細晶白云巖,晶形以平直晶面半自形-非平直晶面它形晶為主,此外還有平直晶面斑狀晶等以及最具特色的非平直晶面鞍形晶。白云巖中發(fā)育一些特殊組構(gòu),如切割白云石的淺-中埋藏環(huán)境形成的縫合線或者裂縫,非平直晶面白云石的破裂和溶解,具有熱液成因指向意義的鞍形白云石;還發(fā)現(xiàn)一些與熱液作用有關(guān)的自生非碳酸鹽礦物,如螢石、氟磷灰石、鈉長石、黃鐵礦等,這些特殊組構(gòu)和礦物的發(fā)現(xiàn)進一步證明了南江中二疊統(tǒng)白云巖的熱液成因。白云石陰極發(fā)光強度較弱,主要發(fā)粉紅色光,方解石發(fā)暗紅色光或不發(fā)光,成巖流體總體上表現(xiàn)為近似海源流體性質(zhì),同時存在外源流體的混入。再結(jié)合前人研究的埋藏史及熱史,我們認為南江橋亭棲霞組白云巖的成因與峨眉山玄武噴發(fā)引起的熱事件有關(guān),溫度升高克服了白云石形成的動力學屏障,熱作用的時間較短導致白云巖化作用不徹底。
[Abstract]:Dolomite reservoir is one of the main carbonate reservoir types. The PetroChina Southwest Oil and Gas Field Branch has discovered dolomite reservoir with industrial value in the Middle Permian in Sichuan Basin. These dolomite reservoirs have a good prospect in oil and gas exploration. Previous studies on the paleobiological characteristics, sedimentary facies, sequence stratigraphy and diagenesis of Qixia formation in Sichuan Basin have made great achievements. But the research results of dolomite are more concentrated in the western part of Sichuan basin, and the study of dolomite in Qixia formation strata in northeast Sichuan is relatively weak. Therefore, in this paper, the petrological characteristics of Qixia formation of the Middle Permian in Jiangqiao Pavilion, East and South Sichuan, are studied by means of field outcrop observation, sheet identification, cathodoluminescence, scanning electron microscopy and X-ray diffraction analysis. The characteristics of dolomite orderliness and influencing factors, diagenetic fluid properties, etc., combined with previous studies on geological background, stratigraphic development, sedimentary facies, burial history and thermal history in northeast Sichuan, Some valuable discussions on the origin of dolomite in Qixia formation of Nanjiang Bridge are carried out. Through comparative study of the dolomite order degree of Qixia formation in Nanjiangqiao section, Guangyuan Yangtze River section, Wujia-1 well, No. 2 well and Qixia formation, the orderliness of dolomite is related to the degree of crystallization. The orderliness of dolomite with larger crystal (such as coarse-mesocrystalline) is better than that with relatively small crystal (such as fine crystal) dolomite is related to the dolomitization degree of carbonate rock. The more complete dolomitization, the higher the orderliness of dolomite; (3) the orderliness of dolomite is related to the content of Fe2 mn _ 2 and Sr _ 2 ions. There is a negative correlation between the content of Fe _ 2H _ 2O _ 2 mn _ 2 and the orderliness of dolomite. 3.The dolomitization of downhole samples is more thorough than that of Nanjiang Qiaoting and Guangyuan Yangtze River Gully, and the orderliness of dolomite is higher. The dolomite order of Hanshen 1 well in the southwest is the highest, and the dolomite order is the lowest in the Nanjiangqiao Ting section in the northeast. This trend also reflects the influence of thermal events. The farther away from the heat source (Emei basalt), the weaker dolomitization. The dolomitization of Qixia formation is not thorough, and the main development is gray dolomite. The dolomite has no original structure and belongs to the medium and fine grain dolomite. The crystal shape is mainly composed of flat crystal face semi-automorphism and non-flat straight crystal plane. In addition, there are porphyry crystal of flat straight crystal plane and saddle crystal of the most characteristic non-straight crystal plane. There are some special structures in dolomite, such as suture or fracture formed in shallow-middle burial environment of cutting dolomite, rupture and dissolution of dolomite with non-straight crystal plane, and saddle-shaped dolomite with hydrothermal origin. Some authigenic non-carbonate minerals related to hydrothermal processes, such as fluorite, fluoroapatite, albite, pyrite and so on, are also found. The discovery of these special fabrics and minerals further proves the hydrothermal genesis of dolomite in the Middle Permian in Nanjiang. Dolomite cathodoluminescence intensity is weak, mainly pink light, calcite dark red light or no luminescence, diagenetic fluid is generally similar to the characteristics of sea source fluid, and there is a mixture of exogenous fluids. Combined with the burial history and thermal history of previous studies, we think that the origin of dolomite in Qixia formation of Nanjiang bridge is related to the thermal events caused by Black Tortoise eruption in Emei Mountain, and the rise of temperature overcomes the dynamic barrier of dolomite formation. The short time of thermal action leads to incomplete dolomitization.
【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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