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

【摘要】：近期我國海相碳酸鹽巖油氣勘探的實(shí)踐表明,生物礁、顆粒灘、白云巖、巖溶風(fēng)化殼等是石油天然氣十分重要的碳酸鹽儲(chǔ)層類型。除巖溶風(fēng)化殼以外,其余幾種商業(yè)儲(chǔ)層的形成均與白云巖化作用密切相關(guān)。因此,對白云巖成因研究也就成為碳酸鹽巖儲(chǔ)層研究中非常重要的組成部分,而白云巖化作用則成為研究的核心內(nèi)容。因此,理清白云巖成因問題,對于認(rèn)識以白云巖及其相關(guān)的碳酸鹽巖為儲(chǔ)層的油氣勘探工作尤為重要。本文在前人研究基礎(chǔ)上,通過鑄體薄片、掃描電鏡觀察、X-衍射和有序度分析,結(jié)合微量元素、碳氧同位素、包裹體測試等分析測試方法,在沉積相分析基礎(chǔ)上,系統(tǒng)地研究了川西北茅口組白云巖的巖石學(xué)和地球化學(xué)特征,主要取得了以下幾點(diǎn)認(rèn)識:1.在結(jié)合前人對川西北地區(qū)二疊統(tǒng)地層的認(rèn)識基礎(chǔ)上,運(yùn)用最新的地層資料(巖芯、錄井、野外實(shí)測等),系統(tǒng)梳理了川西北地區(qū)二疊系地層,詳細(xì)分析了二疊系茅口組的巖性組合規(guī)律和特征,并對其進(jìn)行對比劃分,建立了川西北地區(qū)二疊統(tǒng)地層劃分方案。2.依據(jù)沉積學(xué)與古生物標(biāo)志,通過對研究區(qū)典型鉆井巖心和剖面結(jié)構(gòu)分析,確定川西北茅口組為碳酸鹽臺(tái)地相沉積沉積開闊臺(tái)地相。參考了塔克提出的碳酸鹽沉積相模式,認(rèn)為川西北中二疊統(tǒng)茅口組屬于碳酸鹽巖臺(tái)地沉積體系。3.微量元素分析結(jié)構(gòu),表明各類粉-細(xì)級的晶粒白云巖的Sr含量較高,反映埋藏成巖環(huán)境下的白云巖化作用,發(fā)生在蒸發(fā)濃縮的高鹽度海源地層水流體中,而粗-中晶白云巖與加深埋藏過程中由重結(jié)晶作用引起的白云石脫Sr作用有關(guān)。從δ13C與δ18O關(guān)系圖中,可看出各類白云巖的δ13C值和δ18O值分布相對集中,其成巖流體性質(zhì)相似或同源,其中的晶粒白云巖的δ13C值較穩(wěn)定,而δ18O有較大的負(fù)偏,表明白云巖化作用發(fā)生在溫度較高,成巖流體很可能來源于深循環(huán)的、有巖漿熱液參與的地層水,說明晶粒白云巖為埋藏白云巖化作用的產(chǎn)物4、流體包裹體特征分析中,據(jù)分析表明茅口組方解石主要形成于深埋藏高溫環(huán)境,進(jìn)一步證明茅口組白云巖是埋藏期白云巖化作用。
[Abstract]:Recent oil and gas exploration practice of marine carbonate rocks in China shows that reef, granular beach, dolomite and karst weathering crust are very important carbonate reservoir types of petroleum and natural gas. With the exception of karst weathering crust, the formation of other commercial reservoirs is closely related to dolomitization. Therefore, the study of dolomite genesis has become a very important part of carbonate reservoir research, and dolomitization has become the core of the study. Therefore, it is very important to clarify the origin of dolomite in order to understand the oil and gas exploration with dolomite and its related carbonate rock as reservoir. On the basis of the previous studies, the author observed the X-diffraction and order degree of the cast body by scanning electron microscope, combined with trace elements, carbon and oxygen isotopes, inclusions and other analytical methods, on the basis of sedimentary facies analysis. The petrology and geochemistry of dolomite of Maokou formation in northwestern Sichuan are systematically studied. The main results are as follows: 1. Based on the previous understanding of Permian strata in Northwest Sichuan, the Permian strata in Northwest Sichuan are systematically combed with the latest formation data (core, logging, field measurements, etc.) The law and characteristics of lithologic assemblage of Maokou formation of Permian system are analyzed in detail, and the stratigraphic division scheme of Permian Permian in northwestern Sichuan is established. On the basis of sedimentology and paleobiological markers, through the analysis of typical drilling cores and section structure in the study area, it is determined that Maokou formation in northwest Sichuan is a carbonate platform facies sedimentary open platform facies. Referring to the carbonate sedimentary facies model proposed by Tucker, it is considered that the Maokou formation of the Middle Permian in northwestern Sichuan belongs to the carbonate platform sedimentary system. The trace element analysis structure shows that the Sr content of various kinds of silt-fine grain dolomite is relatively high, which reflects the dolomization in buried diagenetic environment and occurs in the high-salinity marine source formation with evaporation and concentration. The coarse-mesocrystalline dolomite is related to the removal of Sr from dolomite by recrystallization in the process of deepening burial. From the diagram of 未 13C and 未 18O, it can be seen that the distribution of 未 13C and 未 18O values of dolomite is relatively concentrated, the diagenetic fluid properties are similar or homologous, the 未 13C value of grain dolomite is relatively stable, and 未 18O has a large negative deviation. The results show that dolomitization occurs at high temperature and diagenetic fluid is probably derived from deep circulation and magmatic hydrothermal fluid, indicating that grain dolomite is the product of buried dolomization, and the fluid inclusion characteristics are analyzed. The analysis shows that the calcite of the Maokou formation was mainly formed in the deep buried high temperature environment, which further proves that the dolomite of the Maokou formation is dolomitization during the burial period.
【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】：P618.13

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 高梅生;鄭榮才;文華國;李聯(lián)新;李虹;;川東北下三疊統(tǒng)飛仙關(guān)組白云巖成因——來自巖石結(jié)構(gòu)的證據(jù)[J];成都理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2007年03期

2 王保全;強(qiáng)子同;張帆;王興志;王一;曹偉;;鄂爾多斯盆地奧陶系馬家溝組馬五段白云巖的同位素地球化學(xué)特征[J];地球化學(xué);2009年05期

3 蘇中堂;陳洪德;徐粉燕;張成弓;林良彪;;鄂爾多斯盆地馬家溝組白云巖稀土元素地球化學(xué)特征[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2012年S2期

4 劉燕;付金華;李建明;;鄂爾多斯盆地東部奧陶系馬家溝組白云巖成因機(jī)理分析[J];石油天然氣學(xué)報(bào);2011年11期

5 李安仁;張錦泉;鄭榮才;帥世敏;王少飛;;鄂爾多斯盆地下奧陶統(tǒng)白云巖成因類型及其地球化學(xué)特征[J];礦物巖石;1993年04期

6 袁浩;尹富平;楊巍;張廷山;;川西北地區(qū)下二疊統(tǒng)棲霞組白云巖分布與成因探討[J];四川地質(zhì)學(xué)報(bào);2010年04期

相關(guān)博士學(xué)位論文 前3條

1 蘇中堂;鄂爾多斯盆地古隆起周緣馬家溝組白云巖成因及成巖系統(tǒng)研究[D];成都理工大學(xué);2011年

2 胡作維;川東北地區(qū)三疊系飛仙關(guān)組白云巖的形成機(jī)制研究[D];成都理工大學(xué);2010年

3 呂杰;四川盆地西部下二疊統(tǒng)白云巖形成機(jī)制[D];成都理工大學(xué);2013年

相關(guān)碩士學(xué)位論文 前1條

1 冉永良;四川盆地北部周邊構(gòu)造特征研究[D];成都理工大學(xué);2007年

，

本文編號：2007295