【摘要】：玉爾吐斯組黑色頁(yè)巖是塔里木盆地寒武系鹽下最具有潛力的烴源巖之一,普遍認(rèn)為其沉積于統(tǒng)一、相似的沉積環(huán)境(斜坡相),而作者的研究結(jié)果與上述結(jié)論不符。為了探討兩套在巖石礦物組合方面完全不同的黑色巖系分布規(guī)律和成因,并重建其各自的沉積模式,本文對(duì)研究區(qū)12條剖面進(jìn)行了詳細(xì)描述、測(cè)量,從沉積學(xué)特征、巖礦鑒定入手,結(jié)合掃描電子顯微鏡、X-衍射、地球化學(xué)等分析手段,著重研究了庫(kù)勒剖面和于提希剖面兩套黑色巖系的沉積學(xué)特征和地球化學(xué)特征差異。沉積層序、巖石礦物組合、微量元素富集系數(shù)、氧化還原敏感元素比值(V/(V+Ni)、V/Cr、U/Th)、REE+Y配分模式、有機(jī)質(zhì)含量以及飽和烴色譜特征分析結(jié)果表明:兩套黑色頁(yè)巖均為有機(jī)質(zhì)高度富集的,處于熱成熟生油階段的海相優(yōu)質(zhì)烴源巖(干酪根類型Ⅱ1-Ⅱ2型,第一套黑色頁(yè)巖TOC均值為5.37%,第二套TOC均值為1.46%),均沉積于海水氧化-還原分層的還原環(huán)境,但各自的空間展布規(guī)律和控制因素差異較大。建立了熱液噴流缺氧模式和斜坡缺氧沉積模式:第一套黑色頁(yè)巖主要沉積于第一個(gè)旋回海侵高峰期水體較深、沉積速率較高的內(nèi)緩坡,其發(fā)育主要受熱液噴流活動(dòng)、微生物活動(dòng)以及氧化還原條件影響,分布范圍廣,臺(tái)內(nèi)厚,緩坡帶薄,靠近臺(tái)內(nèi)或臺(tái)地內(nèi)部熱液噴流中心的裂洼陷主要控制著該套黑色頁(yè)巖的展布,成烴生物以底棲藻類、細(xì)菌為主,少量浮游藻類為輔;而第二套黑色頁(yè)巖主要沉積于第二旋回海侵初期水體不斷變深的中-外緩坡低能帶,其發(fā)育主要受古生產(chǎn)力、氧化還原條件以及古地形(斜坡陡緩)控制,分布范圍局限,外緩坡帶厚度較穩(wěn)定,靠近臺(tái)內(nèi)不發(fā)育,成烴生物以浮游藻類為主,微生物和低等水生生物為輔,其發(fā)育條件則在臺(tái)緣中-外緩坡更為有利。
[Abstract]:The black shale of the Yultuosi formation is one of the most potential source rocks under the Cambrian salt in the Tarim Basin. It is generally considered that the shale is deposited in a unified and similar sedimentary environment (slope facies), but the author's findings are not consistent with the above conclusions. In order to discuss the distribution and genesis of two sets of black rock series in rock and mineral assemblage, and to reconstruct their respective sedimentary models, 12 sections of the study area are described in detail and measured, and the characteristics of sedimentology are measured. By means of scanning electron microscope (SEM), X-ray diffraction (XRD) and geochemistry, the differences of sedimentary and geochemical characteristics of two sets of black rock series in Kule section and Yutixi section are studied. Sedimentary sequence, rock mineral assemblage, trace element enrichment coefficient, redox sensitive element ratio (V / (V Ni), V _ (r) Cr _ (r) / T _ h), REE Y), The analytical results of organic matter content and saturated hydrocarbon chromatographic characteristics show that the two sets of black shale are highly enriched in organic matter and are of high quality marine source rocks (kerogen type 鈪，

本文編號(hào)：2354357