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庫車坳陷原油中重排藿烷類化合物的組成特征與成因探討

發(fā)布時間:2018-08-02 15:26
【摘要】:重排藿烷類化合物是飽和烴生物標(biāo)志化合物的重要組成部分,廣泛分布于地質(zhì)體中的烴源巖與原油中。近年來,有關(guān)高豐度重排藿烷類化合物的烴源巖和原油的研究成果屢見報(bào)道,但其來源與成因尚不清楚。所以探討地質(zhì)體中高含量重排藿烷類化合物的形成條件、主控因素、成因機(jī)理以及在石油地質(zhì)中的應(yīng)用,對油氣勘探領(lǐng)域中,尤其是對一些疊合盆地油氣勘探過程中急需解決的關(guān)鍵問題如油-源的精細(xì)對比、主力油源巖的準(zhǔn)確厘定具有重要的意義。本文在廣泛調(diào)研國內(nèi)外文獻(xiàn)資料以及塔里木盆地庫車坳陷(大宛齊油田和大北油田)相關(guān)地質(zhì)資料的基礎(chǔ)上,系統(tǒng)采集了46個原油樣品。通過色譜、色譜-質(zhì)譜分析技術(shù),系統(tǒng)地剖析原油地球化學(xué)特征及其分布規(guī)律,結(jié)合原油中不同豐度的重排藿烷類化合物進(jìn)行一系列的對比研究?坍嬃瞬煌S度重排藿烷類化合物的原油在生標(biāo)組合上的差異及其組成特征,探討了沉積環(huán)境、生物來源以及成熟度對重排藿烷類化合物形成的影響。通過樣品分析、資料處理以及地質(zhì)-地球化學(xué)綜合研究,主要取得了以下主要認(rèn)識:1、塔里木盆地庫車坳陷的46個原油樣品以輕質(zhì)油和凝析油為主。顏色從無色到深棕色。總體上原油性質(zhì)具有6低特征:低密度、低粘度、低含硫量、低含蠟量、低膠質(zhì)-瀝青質(zhì)、低凝固點(diǎn)的特點(diǎn)。全烴色譜面貌表現(xiàn)為大部分原油中正構(gòu)烷烴分布完整,有苯系物與甲基環(huán)己烷的存在,少數(shù)原油樣品受到不同程度次生蝕變作用的影響。2、原油C7輕烴系列組成總體上甲基環(huán)己烷(MCyC6)的相對百分含量占優(yōu)勢;規(guī)則甾烷C27、C28、C29主要呈不對稱“V”型分布,且以C29甾烷為優(yōu)勢;芳烴化合物中以萘系列化合物為主,并檢測到并檢測到熒蒽、苯并[a]蒽和芘等化合物,說明有機(jī)質(zhì)來源以陸源輸入為主。原油飽和烴Pr/Ph主要介于1.2-3.0之間,伽馬蠟烷/C30藿烷比值介于0.18-0.28,指示出淡水-微咸水條件下的弱氧化-弱還原環(huán)境。MPI-1、MPR、F1、F2的成熟度參數(shù)的研究均表明塔里木盆地庫車坳陷原油處于成熟階段,且成熟度差異不大。原油成因類型分為兩種:第一類原油具有伽馬蠟烷優(yōu)勢,重排甾烷、重排藿烷豐度較低;第二類原油伽馬蠟烷的豐度相對較低,重排甾烷、重排藿烷十分發(fā)育。3、原油通過GC-MS分析檢測出17a(H)-重排藿烷系列、18α[(H)-新藿烷系列以及早洗脫重排藿烷系列三個重排藿烷系列化合物。以C30重排藿烷/C30藿烷(C30*/C30H)比值為標(biāo)準(zhǔn)將重排藿烷類化合物的相對豐度劃分為三個等級:C30*/C30H1.0時為異常高豐度重排藿烷(27個原油樣品),C30*/C30H=0.2~1.0時為高豐度重排藿烷類(16個原油樣品),C30*/C30H0.2時為低豐度重排藿烷(3個原油樣品)。原油樣品中重排藿烷類化合物之間的關(guān)系表明具有相似碳骨架結(jié)構(gòu)的重排藿烷類化合物間相關(guān)性相對較好,而具有不同碳骨架的重排藿烷類化合物之間相關(guān)性與前者相比略微差之。說明重排藿烷類化合物中相同系列化合物具有相同演化路徑與形成機(jī)制,而重排藿烷類化合物不同系列化合物形成機(jī)理可能有所差別。4、原油中重排藿烷類化合物與生標(biāo)組合之間的關(guān)系:原油樣品中伽馬蠟烷比值(G/C30藿烷)的分布介于0.1-0.29之間,平均值為0.16。重排藿烷類化合物相對豐度與Pr/Ph、G/C30H三者之間呈現(xiàn)一定的相關(guān)性,顯示出沉積環(huán)境可能對重排藿烷類化合物的相對豐度有一定的影響。原油中C24四環(huán)萜烷/C23三環(huán)萜烷(C24Te/C23TT)介于0.26-1.79之間,平均值為1.28;C24四環(huán)萜烷/C26三環(huán)萜烷(C24Te/C26TT)介于0.67-4.5之間,平均值為2.9。不同系列的重排藿烷類化合物與C24Te/C23TT、C24Te/C26TT均存在正相關(guān)關(guān)系,反映了C24四環(huán)萜烷與重排藿烷類化合物的形成可能存在某種程度的聯(lián)系。原油中C27重排甾烷/C27規(guī)則甾烷比值分布在0.21-1.8之間,均值為0.89;C29重排甾烷/C29規(guī)則甾烷比值分布在0.18-0.65之間,均值為0.5。重排藿烷類化合物與重排甾烷參數(shù)之間表現(xiàn)出良好的正相關(guān)關(guān)系,揭示了重排甾烷可能與重排藿烷類化合物的形成機(jī)理相類似。5、原油中重排藿烷類化合物與芳烴化合物之間的關(guān)系:原油中二環(huán)芳烴和三環(huán)芳烴(低環(huán)芳烴)在低豐度重排藿烷類化合物的原油中相對百分含量較低,分布在94.66%~98.95%之間,平均值為96.84%,在高豐度和異常高豐度重排藿烷類化合物的原油中相對百分含量較高,平均達(dá)到了98.37%、98.55%。四環(huán)和五環(huán)芳烴(多環(huán)芳烴)則在高-異常高豐度重排藿烷類化合物的原油中相對百分含量較低,在低豐度重排藿烷原油中含量相對較高。重排藿烷類化合物有著隨低環(huán)芳烴相對含量增大而增高、隨多環(huán)芳烴相對含量降低而增高的趨勢。由此可見,重排藿烷類化合物與二環(huán)芳烴和三環(huán)芳烴有著較為相似的形成條件和母質(zhì)來源。原油三芴系列化合物中總體上以氧芴(OF)為主,其相對百分含量在22.95%-74.69%之間,平均為55.17%;其次是硫芴(SF)的相對含量平均為23.97%。原油樣品中重排藿烷類化合物相對豐度與OF/(F+OF)之間存在正相關(guān)趨勢。表明二者具有相似的沉積環(huán)境。6、原油中重排藿烷類化合物與次生作用之間的關(guān)系:主要是運(yùn)移分餾作用對重排藿烷類化合物的影響。原油中烷基萘系列化合物中隨多烷基萘豐度的降低,萘或甲基萘豐度是明顯增加;菲系列化合物中隨著多烷基菲相對豐度的降低,甲基菲和不帶烷基側(cè)鏈的菲的豐度增加。由于原油的成熟度差異較小,且微生物的輕度降解作用對芳烴組成的影響不大,因而這種分布特點(diǎn)很可能與原油的運(yùn)移分餾作用有關(guān)。因此選取抗生物降解能力較強(qiáng)的金剛烷類化合物相關(guān)比值作為衡量原油運(yùn)移分餾作用大小的參數(shù),不同重排藿烷類化合物與1-甲基金剛烷/1-乙基金剛烷(1M-AD/1Et-AD)、1-甲基金剛烷/4-甲基雙金剛烷(1M-AD/4-MDD)比值表現(xiàn)出一定相關(guān)性。表明運(yùn)移分餾作用會對重排藿烷類化合物相對豐度的產(chǎn)生一定的影響。7、通過上述綜合研究成果揭示,塔里木盆地庫車坳陷原油中重排藿烷類化合物的相對豐度主要受控于沉積環(huán)境和生物來源。在弱氧化-弱還原環(huán)境中,水體鹽度較低,陸源高等植物的貢獻(xiàn)越大越有利于重排藿烷類化合物的形成。運(yùn)移分餾作用對重排藿烷類化合物相對豐度的有一定影響,但不是主控因素;此外,本論文原油的成熟度相似,原油中重排藿烷類化合物的相對豐度與成熟度參數(shù)相關(guān)性沒有很好的對應(yīng)關(guān)系。
[Abstract]:Rearranged Epimedium is an important component of the biomarker of saturated hydrocarbon, which is widely distributed in source rocks and crude oil in geological bodies. In recent years, the research results of source rock and crude oil of high abundance reader compounds have been reported, but the source and cause are not clear. Therefore, the high content of the geological bodies is discussed. The formation conditions, main controlling factors, genetic mechanism and application in petroleum geology are important for the key problems of oil and gas exploration, such as the fine contrast of oil source in the oil and gas exploration of some superimposed basins, and the accurate determination of the main source rocks is of great significance. This paper is widely investigated in this paper. On the basis of relevant geological data from the domestic and foreign literature and the Kuche depression of the Tarim Basin (DA Wan Qi oilfield and daybei oilfield), 46 crude oil samples were collected systematically. The geochemical characteristics and distribution rules of crude oil were systematically analyzed by chromatography and chromatography-mass spectrometry. A series of comparative studies were carried out. The differences and composition characteristics of crude oil in the biological standard combinations were depicted. The effects of depositional environment, biological sources and maturity on the formation of rearrangement of rearranged plants were discussed. The following main understandings should be obtained: 1, 46 crude oil samples in the Kuche depression of Tarim Basin are mainly light oil and condensate oil. Color from colorless to dark brown. In general, the properties of crude oil have 6 low characteristics: low density, low viscosity, low sulfur content, low wax content, low glial asphaltene and low solidification point. All hydrocarbon chromatographic features are large. The distribution of n-alkanes in some crude oils is complete, with the presence of benzene and methyl cyclohexane, and some of the crude oil samples are affected by the secondary alteration of different degrees.2, and the relative percentage of methyl cyclohexane (MCyC6) is dominant in the C7 light hydrocarbon series of crude oil, and the C27, C28 and C29 of regular steranes are mainly asymmetric "V" type distribution. C29 sterane is dominant; naphthalene series compounds are the main compounds in aromatics, and fluoranthene, benzo, [a] anthracene and pyrene are detected and detected. It shows that the source of organic matter is mainly by land source. The crude oil saturated hydrocarbon Pr/Ph is between 1.2-3.0 and the ratio of gamma paraffane / C30 is 0.18-0.28, indicating the condition of fresh water and brackish water. The study on the maturity parameters of.MPI-1, MPR, F1 and F2 in the weak oxidation and weak reduction environment all indicate that the crude oil in Kuche depression in Tarim Basin is in the mature stage, and the difference of maturity is small. The origin type of the crude oil is divided into two kinds: the first kind of crude oil has the advantage of gamma paraffane, rearrangement sterane, the abundances of rearrangement of the rearrangement of the crude oil, the second kind of crude oil gamma wax The abundance of alkanes is relatively low, rearrangement of sterane, rearrangement of the rearrangement of.3, and the detection of 17a (H) - rearrangement Epimedium series by GC-MS, 18 alpha [(H) - Epimedium series and early eluate rearrangement rearrangement series of three rearrangement anadytine series. The rearrangement of the rearrangement of the rearrangement of the rearrangement of the rearrangement of the /C30 and the C30*/C30H) The relative abundance is divided into three grades: the abnormal high abundance rearrangement Epimedium (27 crude oil samples) at C30*/C30H1.0, the high abundance rearrangement Epimedium type (16 crude oil samples) and the low abundance rearrangement Epimedium (3 crude oil samples) at the time of C30*/C30H=0.2 to 1. The relationship between the rearrangement rearrangement of the crude oil samples shows that the relationship between the rearrangement and the rearrangement of the crude oil samples shows the phase. The correlation of the rearrangement reschedule like compounds with carbon skeleton is relatively good, but the correlation between the rearrangement reschedule compounds with different carbon skeletons is slightly worse than that of the former. It shows that the same series of compounds in the rearrangement reschedule compounds have the same evolutionary path and formation mechanism, and the rearrangement of the rearrangement of the rearrangement of the compound is different. The formation mechanism of the compound may be different.4, the relationship between the rearrangement of the crude oil in the crude oil and the biological standard combination: the distribution of the gamma paraffane ratio (G/C30) in the crude oil samples is between 0.1-0.29, and the mean value is that the relative abundance of the 0.16. rearrangement anadine compounds with Pr/Ph and G/C30H three shows a certain correlation. The sedimentary environment may have a certain influence on the relative abundance of rearranged padeanes. C24 tetracycline /C23 triterpene (C24Te/C23TT) in crude oil is between 0.26-1.79 and 1.28; C24 tetracyclic terpene /C26 triterpenane (C24Te/C26TT) is between 0.67-4.5, and the average value is 2.9. different series of rearrangement and C24. There is a positive correlation between Te/C23TT and C24Te/C26TT, which reflects the possible relationship between the C24 tetracycline and the rearrangement of the rearrangement of the compound. The /C27 regular sterane ratio of the C27 rearrangement sterane in the crude oil is between 0.21-1.8, with a mean of 0.89; the C29 rearrangement sterane /C29 gauge is distributed between 0.18-0.65 and 0.5. There is a good positive correlation between rearrangement and rearrangement of sterane parameters, which reveals that rearrangement sterane may be similar to.5, and the relationship between rearrangement reschedule and aromatics in crude oil: low abundance of PAH and arene (low cyclic aromatic hydrocarbons) in crude oil The relative percentage of the crude oil in the rearrangement of the crude oil is low, between 94.66% and 98.95%, with an average of 96.84%. The relatively high percentage of the crude oil in the crude oil of high abundance and abnormally high abundance of rearranged oil is 98.37%, the 98.55%. four ring and the five ring aromatic hydrocarbons (polycyclic aromatic hydrocarbons) are in high abnormally high abundance rearrangement. The relative content of the crude oil in the crude oil is relatively low, and the content of the crude oil in the low abundance rearrangement oil is relatively high. The rearrangement of the rearrangement compound increases with the increase of the relative content of the low cyclic aromatic hydrocarbons and increases with the decrease of the relative content of polycyclic aromatic hydrocarbons. There are relatively similar forming conditions and parent material sources. The three fluorene Series in crude oil are mainly composed of fluorene (OF), with a relative percentage of 55.17%, and the relative content of sulfur fluorene (SF) is the average of the relative abundance between the rearrangement and OF/ (F+OF) of the 23.97%. crude oil samples. The relationship between the two has a similar sedimentary environment.6, and the relationship between the rearrangement and secondary effects of the rearrangement of the crude oil is mainly the effect of the migration and fractionation on the rearrangement of the rearrangement compound. The abundances of alkyl naphthalene in the naphthalene series in the crude oil are decreased with the abundance of poly alkyl naphthalene, and the abundance of naphthalene or methylnaphthalene is obviously increased; As the relative abundance of do Kifi decreased, the abundance of phenanthrene in methyl phenanthrene and non alkyl side chains increased. Due to the small difference in maturity of crude oil, and the slight degradation of microbes had little effect on the composition of aromatics, this distribution was likely to be related to the migration and fractionation of the original oil. The relative ratio of adamantane compounds with strong degrading ability is used as a parameter to measure the size of crude oil migration and fractionation, and the ratio of different rearranged alanine compounds with 1- methyladamantane / 1- ethyl adamantane (1M-AD/1Et-AD), 1- methyladamantane / 4- methylene dimethyladamantane (1M-AD/4-MDD) has a certain correlation. The relative abundances of the rearrangement of the rearrangement of the compound were affected by.7. Through the comprehensive study, the relative abundance of the rearrangement of the oil in the Kuche depression of the Tarim Basin was mainly controlled by the sedimentary environment and the biological source. In the weak oxidation weak reduction ring, the salinity of the water body was low and the tribute of the high terrestrial plants was given. The migration and fractionation has a certain effect on the relative abundance of the rearrangement of the rearrangement of the rearrangement, but not the main control factor. In addition, the maturity of the crude oil is similar, and the relative abundance of the rearrangement of the rearrangement of the crude oil in the crude oil has no good correlation with the correlation of maturity parameters.
【學(xué)位授予單位】:長江大學(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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