本文選題：羌塘盆地 + 熱覺茶卡組　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：羌塘盆地油氣資源豐富,但是前人對羌塘盆地油氣的研究主要集中于三疊系和侏羅系地層,對羌塘盆地古生代烴源巖研究較少。本文運用巖石學(xué)、沉積學(xué)、油氣有機地球化學(xué)方法,結(jié)合野外調(diào)查與室內(nèi)工作,對比相關(guān)資料與學(xué)術(shù)研究成果,對北羌塘盆地鯉魚山-長梁山地區(qū)上二疊統(tǒng)熱覺茶卡組和上三疊統(tǒng)圖中湖組實測地層剖面進行系統(tǒng)研究。通過野外剖面研究與室內(nèi)顯微鏡下鑒定,結(jié)果表明,研究區(qū)內(nèi)上二疊統(tǒng)熱覺茶卡組是一套陸源碎屑復(fù)理石建造偶夾碳酸鹽巖,其巖性主要為暗色頁巖、泥頁巖與巖屑砂巖、粉砂巖互層。上三疊統(tǒng)圖中湖組為一套中層鈣質(zhì)砂巖夾厚-巨厚層火山角礫巖,局部有變質(zhì)現(xiàn)象。運用沉積學(xué)對熱覺茶卡組和圖中湖組沉積相和沉積環(huán)境分析,表明研究區(qū)內(nèi)上二疊統(tǒng)熱覺茶卡組為咸水還原沉積環(huán)境,以淺海陸棚相為主。圖中湖組沉積環(huán)境為寧靜的半深海環(huán)境,以次深水盆地相為主。通過生物標(biāo)志化合物分析,表明研究區(qū)內(nèi)上二疊統(tǒng)熱覺茶卡組有機質(zhì)母源為低等浮游動物(細菌)、低等浮游植物(藍藻、紅藻等),并在晚二疊世海退后,接受了一定比例陸生植物來源。通過對烴源巖進行有機地球化學(xué)分析,表明在熱覺茶卡組19件烴源巖樣品中,有13件樣品有機碳含量達到1.0%以上,屬于好烴源巖,占68.4%。有6件樣品含量介于0.6%-1.0%之間,屬于中等烴源巖,在7件圖中湖組烴源巖中,7件有機碳含量均小于0.4%,不是有效烴源巖。熱覺茶卡組烴源巖樣品大部分以腐泥組為主,其具有較好的生烴能力,其含量介于57%-78%之間,平均值為64%。鏡質(zhì)組生烴能力比腐泥組低,其百分含量基本為0。惰質(zhì)組生烴能力弱,甚至一部分不生烴,其百分含量處于22%-43%,平均值為35.5%。利用類型指數(shù)Ti可知,熱覺茶卡組以腐殖-腐泥型干酪根為主,占84.2%,腐泥-腐殖型干酪根占15.8%。根據(jù)熱解參數(shù)分析,圖中湖組有機質(zhì)類型為腐殖型。熱覺茶卡組烴源巖鏡質(zhì)體反射率皆大于1.3%,介于1.316-1.457%之間,均值為1.368%,熱覺茶卡組樣品Tmax值在323-522℃間,平均值為392℃,干酪根顏色均為棕褐色。表明有機質(zhì)成熟度為高成熟度階段,已達到生氣階段。而圖中湖組的樣品所測出的鏡質(zhì)體反射率,最高值為0.924%,最低值僅為0.845%,平均值為0.884%,其成熟度為成熟階段,未達到生氣階段。通過對烴源巖綜合評價,表明上二疊統(tǒng)熱覺茶卡組烴源巖有良好的生烴潛力,并推測部分北羌塘盆地古生界地層烴源巖有較好的生烴前景。
[Abstract]:The Qiangtang basin is rich in oil and gas resources, but the previous studies of the Qiangtang Basin mainly focus on the Triassic and Jurassic strata, and there are few studies on the Paleozoic source rocks in the Qiangtang basin. In this paper, the petrology, sedimentology, organic geochemical methods of oil and gas, field investigation and indoor work were used to compare the relevant data and academic research results. A systematic study of the measured stratigraphic profiles of the upper two stack and the upper three superposition of the lake group of the upper Triassic in the North Qiangtang basin, the Chang Liang Shan area, has been systematically studied. The results show that the upper two superposition of the hot tea card group in the study area is a set of dual carbonate rocks of the terrestrial clastic flysch and its rock. The main features are dark shale, shale and lithic sandstone and siltstone interlayer. The upper three series of the lake group is a set of middle calcareous sandstone with thick and thick volcanic breccia, and partial metamorphic phenomenon. The sedimentary facies and sedimentary environment of the hot tea card group and the Tuzhong lake group are analyzed by sedimentology, indicating that the upper two stack hot tea cards in the study area are in the study area. The environment of saline water reduction and deposition is dominated by shallow sea shelf facies. The sedimentary environment of the lake group is tranquil semi deep sea environment, with the primary deep water basin facies. Through the analysis of biomarker compounds, it is indicated that the organic substance source of the upper two superposition hot tea group in the study area is lower zooplankton (bacteria), lower phytoplankton (cyanobacteria, red algae, etc.), and the lower phytoplankton (cyanobacteria, red algae, etc.) in the study area. After the Late Permian sea, a certain proportion of terrestrial plant source was accepted. Through the organic geochemical analysis of the source rocks, it was shown that of the 19 source rock samples of the hot tea card group, 13 samples had more than 1% organic carbon content, and 6 samples of 68.4%. were between the source rocks and the middle source rocks. In the 7 map, 7 organic carbon content is less than 0.4%, which is not the effective source rock. Most of the source rocks in the hot tea card group are mainly in the slime formation, which have good hydrocarbon generation ability, and their content is between 57%-78% and the average value of the 64%. vitrinite is lower than that of the rotten group, and the content is basically 0. inert. It is weak, even part of no hydrocarbon generation, its percentage is in 22%-43%, and the average value of 35.5%. utilization type index Ti shows that the hot tea card group is mainly humic - humid cheese root, 84.2%, and humic - humic kerogen accounts for 15.8%. according to the pyrolysis parameters. The reflectivity is more than 1.3%, which is between 1.316-1.457% and 1.368%. The Tmax value of the hot tea group is at 323-522 C, the average value is 392, and the color of the kerogen is brown. It shows that the maturity of the organic matter is high maturity stage, and it has reached the stage of life. The vitrinite reflectance measured by the sample in the lake group is 0.924. The minimum value is only 0.845%, the average value is 0.884%, and its maturity is the mature stage, which has not reached the stage of gas generation. Through the comprehensive evaluation of source rocks, it is shown that the upper two stack source rocks have good hydrocarbon generating potential, and the hydrocarbon source rocks of the Paleozoic strata in the northern Qiangtang basin have good hydrocarbon generation prospects.
【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

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