本文選題：米倉山 + MVT　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：對四川盆地北緣米倉山地區(qū)燈影組MVT型鉛鋅礦床的實(shí)地勘測表明,研究區(qū)鉛鋅礦與古油藏遺留的瀝青在空間上呈共生關(guān)系,二者均集中分布于燈四段頂部位置,鉛鋅礦含礦層位相對較薄,瀝青在垂向與平面上的分布范圍均遠(yuǎn)大于鉛鋅礦。手標(biāo)本及鏡下可見到瀝青與鉛鋅礦共生,鏡下可見少數(shù)閃鋅礦中包裹有瀝青,顯示二者有一定的成因聯(lián)系。通過對燈影組白云巖儲(chǔ)層中各類自生礦物,如閃鋅礦、方鉛礦、石英、白云石、重晶石、螢石等之間的空間交切關(guān)系分析,厘定研究區(qū)共有七期古地質(zhì)流體:第一期鹽水流體主要形成中晶白云石,第二期古油藏流體形成第一世代瀝青,第三期成礦熱液流體形成石英、白云石、第一世代鉛鋅礦和第一世代重晶石,第四期流體為第二期古油藏,形成第二世代瀝青,第五期鹽水流體形成晶粒白云石、石英,第六期成礦熱液流體形成第二世代閃鋅礦,第七期鹽水流體形成石英、螢石、第二世代重晶石等礦物。對各期古地質(zhì)流體形成的自生礦物進(jìn)行流體包裹體研究,發(fā)現(xiàn)第三期成礦熱液流體與第七期鹽水流體形成的重晶石中主要發(fā)育液相H2O包裹體、氣液H2O包裹體,捕獲有菱鍶礦(SrCO3)、毒重石(BaCO3)、自然硫(S)子礦物,第五期與第七期鹽水流體形成的石英、螢石中主要發(fā)育氣液H2O包裹體、甲烷包裹體。通過流體包裹體顯微測溫,揭示兩期古油藏形成時(shí)間分別為中寒武世末期、二疊世—中三疊世。在第二期古油藏裂解成天然氣藏后,一度保存條件較好,壓力系數(shù)達(dá)到1.29-1.83,但喜馬拉雅運(yùn)動(dòng)期燈影組地層發(fā)生大規(guī)模隆升,氣藏遭受破壞,氣水界面上移,形成的自形石英中包裹有瀝青。兩期鉛鋅礦成礦時(shí)間與古油氣藏成藏時(shí)間有明顯匹配性。米倉山地區(qū)在兩期古油氣藏成藏期間形成的自生礦物中,其捕獲的氣液H2O包裹體和甲烷包裹體中均含CH4、CO2、H2S,尤其是兩期重晶石中的自然硫子礦物,均暗示古油氣藏成藏期間可能發(fā)生過TSR反應(yīng),為鉛鋅成礦提供硫源。
[Abstract]:The field survey of the Dengying MVT type lead-zinc deposit in the Michang Mountain area of the northern margin of Sichuan Basin shows that there is a symbiotic relationship between the lead-zinc deposit and the asphalt left over from the paleoreservoir in the study area, both of which are concentrated on the top of the fourth member of the Dengshan formation. The ore-bearing horizon of lead-zinc ore is relatively thin, and the distribution range of asphalt in vertical and plane is much larger than that in lead-zinc ore. Bitumen and lead-zinc ore can be seen symbiosis in hand specimen and mirror, and a few sphalerite are wrapped in asphalt under microscope, indicating that there is a certain genetic relationship between them. The spatial intersecting relationships between various authigenic minerals such as sphalerite, galena, quartz, dolomite, barite and fluorite in dolomite reservoir of Dengying formation are analyzed. There are seven paleo-geological fluids in the study area: the first phase of saltwater fluid mainly forms mesocrystalline dolomite, the second phase of paleoreservoir fluid forms first generation bitumen, the third stage of ore-forming hydrothermal fluid forms quartz, dolomite, The first generation lead-zinc ore and the first generation barite, the fourth phase fluid is the second phase paleoreservoir, forms the second generation bitumen, the fifth stage brine fluid forms the grain dolomite, the quartz, the sixth stage metallogenic hydrothermal fluid forms the second generation sphalerite, The seventh brine fluid forms quartz, fluorite, second generation barite and other minerals. The fluid inclusions of the authigenic minerals formed by paleo-geological fluids are studied. It is found that in the barite formed by the third hydrothermal fluid and the seventh brine fluid, there are mainly liquid H2O inclusions and gas-liquid H2O inclusions. The quarts formed in the fifth and seventh phases of brine fluid are trapped in the quarts of SrCO _ 3, BaCO _ 3, S _ (S) minerals, and the gas-liquid H _ 2O inclusions and methane inclusions are mainly developed in fluorite. By microthermometry of fluid inclusions, it is revealed that the formation time of the two Paleo-reservoirs is the end of the Middle Cambrian, the Permian and the Middle Triassic respectively. After the second phase paleo-reservoir was cracked into natural gas reservoir, the condition of preservation was good, the pressure coefficient reached 1.29-1.83, but during the Himalayan movement period, the formation of Dengying formation occurred large-scale uplift, the gas reservoir was destroyed, and the gas-water interface was moved up. The formed self-shaped quartz is covered with asphalt. The metallogenic time of lead-zinc ore in two periods is obviously matched with that of paleo-oil and gas reservoir. In the authigenic minerals formed during the formation of paleooil and gas reservoirs in the Micang Mountain area, the captured gas-liquid H2O inclusions and methane inclusions contain Ch _ 4CO _ 2C _ 2H _ 2S, especially the natural sulfur minerals in the barites of the two periods. It is suggested that TSR reaction may have occurred during the formation of paleo-oil and gas reservoirs, which can provide sulfur source for lead-zinc mineralization.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.4

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本文編號(hào)：1788415