本文關(guān)鍵詞： 燈影組 熱液作用 鞍狀白云石 儲(chǔ)層特征　出處：《西南石油大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：本論文主要以地層學(xué)、巖石學(xué)、礦物學(xué)、地球化學(xué)、儲(chǔ)層地質(zhì)學(xué)和國(guó)內(nèi)外最新相關(guān)研究進(jìn)展為理論指導(dǎo),以鉆測(cè)井資料和地震資料為基礎(chǔ),對(duì)高石梯～磨溪地區(qū)震旦系燈影組白云巖的熱液作用進(jìn)行較深入的研究。從巖石學(xué)特征和地球化學(xué)特征上提供了熱液白云巖的存在依據(jù),分析了熱液作用的形成條件及形成模式,并闡述了熱液作用對(duì)儲(chǔ)集空間的改造及燈影組白云巖儲(chǔ)層的形成演化。 熱液作用的巖石學(xué)研究表明,研究區(qū)發(fā)育有以熱液白云巖為母巖的密西西比河谷型礦化作用形成的方鉛礦和閃鋅礦及其共生的熱液附屬礦物：鞍狀白云石、長(zhǎng)石、螢石、石英、黃鐵礦以及方解石,它們以裂縫和孔洞充填或者以交代的方式出現(xiàn)在熱液白云巖中,其中鞍狀白云石被普遍認(rèn)為是熱液作用的指示者。 熱液作用的地球化學(xué)研究表明,研究區(qū)燈影組熱液白云巖與早期白云巖和海水相比,δ180同位素值偏小,是由于溫度效應(yīng)使重的18O進(jìn)入到流體中,輕16O進(jìn)入到白云石中；87Sr/86Sr同位素比值偏大,是由于熱液白云石化作用時(shí),在埋藏條件下有放射性鍶87Sr進(jìn)入到熱液白云巖中,這些放射性87Sr,來(lái)自硅質(zhì)碎屑物,或來(lái)自巖漿作用或變質(zhì)作用的殘余流體；微量元素Mn和Fe值偏大,是由于熱液白云石化作用是在埋藏環(huán)境中發(fā)生的,為還原環(huán)境,熱液流體中的Mn和Fe處于低價(jià)狀態(tài),可以進(jìn)入到白云石晶格中。稀土元素顯示Ce和Eu的正異常,與海水的稀土元素模式相反,可能是由于熱液流體的作用造成的。 結(jié)合研究區(qū)構(gòu)造特征、演化背景及地層特征,分析了熱液作用形成條件,包括由于興凱地裂運(yùn)動(dòng)造成的拉張性的大地構(gòu)造背景、下伏碎屑巖層的熱液儲(chǔ)庫(kù)和上覆沉積層的覆蓋和封堵,并建立了熱液作用形成模式圖。 此外,通過(guò)巖心和巖石薄片的觀察,詳細(xì)闡明了熱液作用改造的儲(chǔ)集空間特征,包括晶間孔和晶間溶孔、角礫孔、熱液溶蝕孔洞、裂縫。分析了研究區(qū)的主要成巖作用,認(rèn)為建設(shè)性的成巖作用包括重結(jié)晶和新生變形作用、巖溶作用、熱液溶蝕作用。最后,探討了儲(chǔ)層的形成與演化過(guò)程,建立了燈影組儲(chǔ)層孔隙演化模式。
[Abstract]:This paper is mainly guided by stratigraphy, petrology, mineralogy, geochemistry, reservoir geology and the latest related research progress at home and abroad, and based on drilling log data and seismic data. The hydrothermal action of dolomite of the Dengying formation of Sinian system in Gaoshiti ~ Moxi area is studied in depth. The petrological and geochemical characteristics of the dolomite are provided as a basis for the existence of hydrothermal dolomite. The forming conditions and forming modes of hydrothermal action are analyzed, and the transformation of reservoir space by hydrothermal action and the formation and evolution of dolomite reservoir in Dengying formation are expounded. The petrological study of hydrothermal action shows that galena and sphalerite formed by the Mississippi Valley mineralization with hydrothermal dolomite as parent rock and their associated hydrothermal subsidiary minerals: saddle dolomite, feldspar, fluorite, Quartz, pyrite and calcite, which appear in hydrothermal dolomite in the form of fractures and pores or in metasomatism, of which saddle dolomite is generally regarded as an indicator of hydrothermal action. The geochemical study of hydrothermal process shows that the 未 180 isotope value of hydrothermal dolomite in Dengying formation is smaller than that of early dolomite and seawater, which is due to the temperature effect that makes heavy 18O into the fluid. The relatively large isotope ratio of 87s / 86Sr into dolomite is due to the presence of radioactive strontium 87Sr into hydrothermal dolomite under burial conditions, which are derived from siliceous debris. Or residual fluid from magmatism or metamorphism, the trace element mn and Fe are higher because hydrothermal dolomitization occurs in a buried environment, and mn and Fe in hydrothermal fluid are in a low-priced state in a reductive environment. The rare earth elements show positive anomalies of ce and EU, contrary to the REE model in seawater, which may be caused by the action of hydrothermal fluids. Based on the structural characteristics, evolution background and stratigraphic characteristics of the study area, the forming conditions of hydrothermal process, including the extensional tectonic background caused by the Xingkai tectonic movement, are analyzed. The hydrothermal reservoir and the overlying deposit of the underlying clastic rock are covered and sealed, and the model diagram of hydrothermal action is established. In addition, through the observation of cores and thin pieces of rock, the reservoir space characteristics of hydrothermal transformation are expounded in detail, including intergranular pore and intergranular solution pore, breccia pore, hydrothermal solution hole and fracture. The main diagenesis of the study area is analyzed. Constructive diagenesis includes recrystallization and new deformation, karstification and hydrothermal dissolution. Finally, the formation and evolution process of reservoir is discussed, and the pore evolution model of Dengying formation is established.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.13

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