本文選題：鶯-瓊盆地　切入點：原油　出處：《浙江大學》2017年碩士論文　論文類型：學位論文

【摘要】：鶯-瓊盆地是我國南海大陸架上重要的新生代含油氣盆地,目前已發(fā)現(xiàn)了崖13-1、DF1-1等大型油氣田及多個含油氣構造,但其勘探程度還比較低,仍具有巨大的油氣資源,勘探前景十分樂觀。本文在細致地研究了原油輕烴、生物標志物和碳同位素組成特征的基礎上,對鶯-瓊盆地東方、樂東和崖城氣田的原油在成烴母質(zhì)及其沉積環(huán)境上進行了區(qū)分,并對各個氣田的原油進行了成因分類;同時,利用漸新世、中新世和上新世不同層位烴源巖飽和烴組分的GC/MS和碳同位素分析資料,進行了精細的油源對比,確定了這三個氣田原油的主要烴源巖。研究表明,樂東和東方氣田原油的輕烴、生物標志物和碳同位素組成特征基本一致,但與崖城氣田的原油明顯不同。樂東和東方氣田的大部分原油全油碳同位素較重(-23.6‰～-21.8‰);其K1值較小,在1.08左右,C7輕烴組分中,二甲基環(huán)戊烷和正庚烷含量高,甲基環(huán)己烷和甲苯含量低;呈姥鮫烷優(yōu)勢(Pr/Ph3),C19三環(huán)萜烷含量低(C19/C233),陸源高等植物的生物標志物奧利烷及其降解產(chǎn)物、雙杜松烷和蒲公英烷的含量均很低,而伽馬蠟烷和4-甲基甾烷含量較高,指示有機質(zhì)生源以水生生物為主,且來源于弱氧化的淺海相烴源巖。其中,DF13-2-1井、DF1-1-14井和LD20-1-2井的原油樣品與樂東和東方氣田的大部分原油有明顯的區(qū)別。其Pr/Ph在3.1～3.4之間,C19/C23比值小于1.0,有含量較高的奧利烷、降A-奧利烷和雙杜松烷等陸源標志物,且4-甲基甾烷很少,表明這類原油來源于氧化性的近岸濱淺海相烴源巖,有機質(zhì)生源以陸源輸入為主,水生生物占有一定比例。崖城氣田的原油全油碳同位素輕得多(-26.9‰～-24.9‰);其K1值較大,達到了1.24,與樂東和東方氣田的原油有明顯的區(qū)分,C7輕烴組分中,富含甲基環(huán)己烷和甲苯,二甲基環(huán)戊烷和正庚烷含量低;姥鮫烷優(yōu)勢顯著(Pr/Ph5),C19三環(huán)萜烷含量高(C19/C236),陸源高等植物的生物標志物奧利烷及其降解產(chǎn)物、雙杜松烷和蒲公英烷的含量很高,幾乎不含伽馬蠟烷和4-甲基甾烷,指示以陸源高等植物為主的生物源,且來源于氧化的海岸沼澤相烴源巖。根據(jù)原油生物標志物的組合特征,可進一步將東方氣田和樂東氣田的原油分成三類,將崖城氣田的原油分成兩類。鶯歌海盆地中新統(tǒng)烴源巖碳同位素較重,在-27.7‰～-20.9‰之間,與樂東和東方氣田的原油接近。其中,黃流組和梅山組泥巖的雙杜松烷和奧利烷含量很低,含有一定的4-甲基甾烷,與樂東和東方大部分原油有較好的對比性,說明其油源主要來自這兩套地層。瓊東南盆地漸新統(tǒng)烴源巖干酪根碳同位素較輕,在-27.3‰～-23.4‰之間,與崖城氣田的原油相近。其中,只有煤和碳質(zhì)泥巖C19/C23比值高(3.5～7.6),與崖城氣田的原油相當,但其奧利烷和雙杜松烷含量很低,與原油不相符合;而泥巖中奧利烷和雙杜松烷都很豐富,與主體原油相近。這表明崖城氣田主體原油是混源巖,源自漸新統(tǒng)各類巖性的源巖。
[Abstract]:Ying Qiong basin is an important continental shelf of the new generation of the South China Sea petroliferous basin in China, has found a cliff 13-1, large oil and gas fields DF1-1 and a number of oil and gas structures, but the exploration degree is relatively low, still have huge oil and gas resources, exploration prospects are very optimistic. This paper studies the light hydrocarbon the crude oil in the detailed, biomarker and carbon isotope composition characteristics based on the Oriental Yingqiong basin, Ledong and Yacheng crude oil were distinguished in the hydrocarbon precursor and its sedimentary environment, and the various fields of crude oil origin classification; at the same time, the use of the Oligocene, Miocene and Pliocene different hydrocarbon source rock saturated hydrocarbon GC/MS and carbon isotope analysis data, compares the fine oil source, the main source of the three crude oil field rock. The results show that light hydrocarbon Ledong and Dongfang gas field of crude oil, biomarker and Carbon isotopic composition is basically the same, but significantly different from Yacheng crude oil. Most of the crude oil Ledong and Dongfang gas field carbon isotope is heavy (-23.6% to -21.8%); the K1 value is small, at around 1.08, C7 light hydrocarbons, two methyl cyclopentane and heptane in high. Methyl cyclohexane and toluene content was low; pristane advantage (Pr/Ph3), C19 tricyclic terpane low content (C19/C233), terrestrial higher plant biomarkers of oleanane and degradation products, the content of double Du Songwan and dandelion alkanes were very low, while the gammacerane and 4- methyl steranes were higher, indicating organic the source matter dominated by aquatic organisms, and from weak oxidation of neritic facies source rocks. Among them, DF13-2-1 well, most of the crude oil DF1-1-14 and LD20-1-2 wells of crude oil samples and Ledong and Dongfang gas field has obvious difference. The Pr/Ph in 3.1 ~ 3.4, the ratio of C19/C23 small In 1, a high content of oleanane, down A- oleanane and double cadinane terrestrial markers, and 4- methyl steranes rarely, showed that coastal shallow marine hydrocarbon source rocks in the oxidation of this kind of source of crude oil, organic matter source by terrestrial input, aquatic organisms occupy a certain proportion of Yacheng. The crude oil and gas carbon isotope much lighter (-26.9% to -24.9%); the K1 value is larger, reaching 1.24, and Ledong and Dongfang gas field of crude oil has obvious distinction, C7 light hydrocarbon, rich in methyl cyclohexane and toluene, two methyl cyclopentane and heptane in low pristane; an advantage (Pr/Ph5), C19 tricyclic terpane high content (C19/C236), terrestrial higher plant biomarkers of oleanane and degradation products, the content of two Du Songwan and dandelion were very high, almost free of gammacerane and 4- methyl steranes, indicated by Lu Yuangao plant biological source, and Due to the oxidation of coastal marsh facies hydrocarbon source rocks. According to the characteristics of crude oil biomarker, may be further east gas and crude oil in Ledong gas field is divided into three categories, the Yacheng crude oil is divided into two categories. The Yinggehai Basin in Miocene hydrocarbon source rocks of carbon isotope is heavy, between -27.7% ~ -20.9%, close to Ledong and Dongfang gas field oil. Among them, Huangliu formation and Meishan formation mudstone double Du Songwan and oleanane content is very low, with certain 4- methyl steranes, compared well with the Ledong and Dongfang most of crude oil, the main oil source from the two sets of Qiongdongnan basin formation. Oligocene source rocks kerogen carbon isotope lighter, between -27.3 ~ -23.4%%, similar to Yacheng. Only the crude oil, coal and carbonaceous mudstone in the high ratio of C19/C23 (3.5 ~ 7.6), and Yacheng crude oil, but the oleanane and double Du Songwan The content is very low, which is not consistent with crude oil. However, in the mudstone, olane and dupentipines are very rich, similar to the main crude oil. This indicates that the main oil in the gas field of Ya Cheng gas field is mixed source rock, which is derived from Oligocene source rocks of all kinds of lithology.

【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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