本文選題：歧口凹陷 + 沙一段　； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：歧口凹陷位于渤海灣盆地,分布了大面積的湖相碳酸鹽巖,具有很好的油氣勘探前景。隨著北大港、板橋以及齊家務(wù)等地區(qū)的開(kāi)發(fā)生產(chǎn),歧口凹陷展示出了巨大的生油潛力,在對(duì)歧口凹陷西側(cè)井位的鉆探過(guò)程中,發(fā)現(xiàn)沙一段地層的白云巖中含有大量油氣資源。因此,對(duì)歧口凹陷古近系沙一段白云巖進(jìn)行研究可以進(jìn)一步挖掘該地區(qū)的潛力,很有現(xiàn)實(shí)意義。本文應(yīng)用掃描電鏡、陰極發(fā)光、X射線衍射等分析測(cè)試方法,結(jié)合鍶同位素、碳氧同位素、主微量元素、稀土元素等地球化學(xué)特征,對(duì)歧口凹陷沙一段進(jìn)行了巖石類型、沉積環(huán)境、成巖環(huán)境以及白云巖成因方面的研究,并對(duì)該時(shí)期的海侵事件進(jìn)行了深入的探討。歧口凹陷沙一段主要發(fā)育泥-微晶灰質(zhì)白云巖、泥-微晶白云巖、亮晶生物碎屑灰質(zhì)白云巖等,這些碳酸鹽巖多和泥頁(yè)巖互層產(chǎn)出。通過(guò)其縱向的巖性對(duì)比,認(rèn)為沙一段時(shí)期研究區(qū)水體不斷上升,水動(dòng)力越來(lái)越弱,還原性不斷增強(qiáng)。整體上,研究區(qū)白云巖輕稀土富集、重稀土相對(duì)虧損;δCe與湖相白云巖極為接近;δLa與Y/Ho值為負(fù)相關(guān)關(guān)系,REE與Al為正相關(guān)關(guān)系、與Ca為負(fù)相關(guān)關(guān)系。以上證據(jù)表明,研究區(qū)白云巖形成于湖相沉積環(huán)境。此外,白云巖δ~(13)C-δ~(18)O相關(guān)性很高,投點(diǎn)呈條帶狀線性分布,兩者具有同步增加的特點(diǎn),反映歧口湖盆在該時(shí)期封閉性較強(qiáng)。研究區(qū)發(fā)現(xiàn)狹口螺等海相古生物化石;白云巖Z值、M值、Sr/Ba、V/Ni、Th/U指示咸水環(huán)境;~(87)Sr/~(86)Sr值與海水極為接近;大部分樣品的δLa、δY、Y/Ho值超出湖相白云巖的區(qū)間,并且向海相白云巖靠近,表現(xiàn)出極強(qiáng)的海水特征。綜合以上證據(jù),認(rèn)為本區(qū)在沙一段時(shí)期發(fā)生過(guò)海侵事件。海侵為湖盆帶來(lái)了大量的Mg~(2+),導(dǎo)致了湖盆的咸化,并且使湖盆的PH值升高,這些因素促成了白云巖化的發(fā)生。六間房與齊家務(wù)地區(qū)的白云巖發(fā)桔紅色光,較為明亮;碳氧同位素分析表明其形成于淺埋藏環(huán)境,沒(méi)有受到甲烷化作用的影響;有序度和Mg/Ca值都很低。綜合分析認(rèn)為該地區(qū)的白云巖是滲透回流模式形成的。歧口與扣村地區(qū)的白云巖整體發(fā)光微弱,甚至不發(fā)光;碳氧同位素反映白云巖形成于淺埋藏環(huán)境,并且受到很強(qiáng)的甲烷化作用;白云石有序度低但是Mg/Ca值整體比齊家務(wù)地區(qū)高,反映其經(jīng)歷了更為充分的成巖作用。綜合分析認(rèn)為該地區(qū)的白云巖為埋藏成因。
[Abstract]:Qikou sag is located in the Bohai Bay basin and has a large area of lacustrine carbonate rocks, which has a good prospect of oil and gas exploration. With the development and production of Beidagang, Banqiao and Qijiao areas, Qikou sag has shown great oil generation potential. During the drilling of wells in the west side of Qikou Sag, it was found that there are a lot of oil and gas resources in dolomite in the formation of Shayi formation. Therefore, the study of dolomite in the first member of the Paleogene Sha in Qikou Sag can further exploit the potential of this area, which is of great practical significance. In this paper, the rock types of the first member of the Sha member in Qikou depression have been studied by means of scanning electron microscope, cathodoluminescence X-ray diffraction and geochemical characteristics of strontium isotope, carbon oxygen isotope, main trace element, rare earth element, etc. The sedimentary environment diagenetic environment and dolomite genesis are studied and the transgression events in this period are discussed. The mud-microcrystalline dolomite, mud-microcrystalline dolomite and lime-dolomite are mainly developed in the first member of Sha in Qikou Sag. These carbonate rocks are abundant and interbedded with shale. Through the longitudinal lithology comparison, it is considered that the water body in the study area is rising continuously, the hydrodynamic force is getting weaker and the reductivity is increasing. On the whole, the dolomite in the study area is enriched in light rare earth and relatively depleted in heavy rare earth; 未 ce is very close to lacustrine dolomite; 未 La is negatively correlated with Y/Ho value; REE is positively correlated with Al, and negatively correlated with Ca. The above evidence indicates that dolomite was formed in the lacustrine sedimentary environment. In addition, the correlation of 未 ~ (13) C ~ (-) ~ (18) O in dolomite is very high, and the distribution of the drop points is linear in a strip, which shows that the Qikou Lake basin is closed in this period. Marine paleontological fossils such as the narrow mouth snail were found in the study area. The Z value of dolomite and the value of S r / BaV / V / Ni / T / U indicate that the brackish water environment is very close to that of seawater, and the 未 La, 未 YTY / Ho values of most samples exceed the interval of lacustrine dolomite and are close to the marine dolomite. It shows very strong characteristics of sea water. Combined with the above evidence, it is concluded that transgression occurred in this area during a period of sand. The transgression brought a large amount of Mg~(2 to the lake basin, which led to the salinization of the lake basin and the increase of the PH value of the lake basin. These factors contributed to the occurrence of dolomitization. The dolomite in the six rooms and the domestic areas has bright orange light, and the carbon and oxygen isotopic analysis shows that it was formed in shallow burial environment and was not affected by methanation, and the order degree and Mg/Ca value are very low. It is considered that the dolomite in this area is formed by the permeation reflux model. The dolomite in Qikou and Jiucun areas is weak or even non-luminous; carbon and oxygen isotopes show that dolomite was formed in shallow burial environment and was strongly methanized; dolomite order is low but Mg/Ca value is higher than that in domestic areas. It reflects that it has experienced more sufficient diagenesis. It is considered that the dolomite in this area is the burial origin.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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