本文關(guān)鍵詞： 梨樹斷陷 烴源巖 地球化學(xué)特征 原油 生物標(biāo)志化合物 油源對比　出處：《長江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：梨樹斷陷位于松南斷陷群的南部,該盆地的烴源巖發(fā)育良好,存在大量的石油天然氣資源。本文使用常規(guī)地球化學(xué)實驗分析方法和生物標(biāo)志化合物分析方法,對松遼盆地梨樹斷陷下白堊統(tǒng)營城組的烴源巖和原油進(jìn)行了系統(tǒng)的研究,結(jié)合前人的研究成果,來確定梨樹斷陷烴源巖的地球化學(xué)特征,劃分主力烴源巖,進(jìn)行油源對比,為梨樹斷陷進(jìn)一步的勘探開發(fā)給出一份理論上的依據(jù)。1、梨樹斷陷營城組烴源巖以中等-好烴源巖為主,還發(fā)育有部分優(yōu)質(zhì)烴源巖。其中,優(yōu)質(zhì)烴源巖主要分布在盆地西南部深凹帶,在雙龍次凹和后五家戶—小城子一帶發(fā)育有好烴源巖,八屋地區(qū)大部分為中等-好烴源巖,北部斜坡部分地區(qū)分布有中等-好烴源巖,秦家屯和皮家地區(qū)烴源巖發(fā)育比較差。烴源巖有機(jī)質(zhì)類型主要為Ⅱ型和Ⅲ型。烴源巖有機(jī)質(zhì)熱演化程度大多處于成熟階段,部分地區(qū)處于高成熟階段。綜合以上,梨樹斷陷營城組主力烴源巖分布在后五家戶—小城子西邊的深凹帶,其次雙龍次凹和八屋地區(qū)的營城組烴源巖也是重要的油氣來源。2、斷陷盆地由中部至周邊,水體鹽度不斷降低,還原性不斷變?nèi)�。梨樹斷陷營城組烴源巖有機(jī)質(zhì)有雙重來源,包括陸源高等植物和低等水生生物,其中陸源高等植物貢獻(xiàn)比較大,是典型的發(fā)育在斷陷湖盆的烴源巖。多數(shù)烴源巖的沉積環(huán)境為深湖-半深湖相,具有較深的水體,比較強(qiáng)的還原性,并且藻類和高等植物是有機(jī)質(zhì)輸入的主體;部分為淺湖相(八屋地區(qū)SN65井和SN118井),具有較淺的水體,比較弱的還原性,烴源巖有機(jī)質(zhì)輸入以高等植物為主;沉積環(huán)境為濱湖-河流相的烴源巖分布在雙龍次凹,這種沉積環(huán)境水體較淺,還原性較弱,烴源巖有機(jī)質(zhì)輸入以高等植物為主。3、梨樹斷陷營城組原油具有湖相油的特點(diǎn),形成于偏還原性的微咸水-咸水沉積環(huán)境,有機(jī)質(zhì)來源主要為陸源高等植物,此外還包括藻類和細(xì)菌等低等生物。正構(gòu)烷烴C10~C38分布完整,絕大多數(shù)為單峰型,主峰碳主要為C21。各油田的原油的正構(gòu)烷烴輕重比nC21-/nC22+、CPI和OEP值均變化不大。絕大多數(shù)原油三環(huán)萜烷系列化合物呈主峰為C23的正態(tài)分布,原油樣品C26以后的長鏈三環(huán)萜烷含量比較高,呈現(xiàn)出“翹尾巴”的特征,梨樹斷陷各區(qū)塊營城組原油都具有比較高含量的伽馬蠟烷,原油伽馬蠟烷/C30藿烷比值分布在0.33~1.10的范圍內(nèi)。原油絕大多數(shù)處于成熟階段,且八屋油田BK60區(qū)塊和SN54區(qū)塊的原油成熟度較其他地區(qū)高。4、按照原油的地球化學(xué)特征,把原油分為了以下三類:Ⅰ類原油C24四環(huán)二萜/C26三環(huán)萜烷的值為0.23~0.65,三環(huán)萜烷/五環(huán)三萜的值為0.07~0.43,Ts≤Tm,伽馬蠟烷/C30藿烷的值是0.16~0.42;Ⅱ類原油C24四環(huán)二萜/C26三環(huán)萜烷的值是0.11~0.28,三環(huán)萜烷/五環(huán)三萜的值是0.47~4.06,TsTm,伽馬蠟烷/C30藿烷的值是0.42~1.10;Ⅲ類原油的地化特征處在上述兩者之間,是由二者混合生成的。5、梨樹斷陷營城組Ⅰ類原油與營城組烴源巖具有相似的甾萜烷組成特征,C28三環(huán)萜烷和C29三環(huán)萜烷豐度都比較低,Ts與Tm豐度差不多,C29Ts和C30重排藿烷豐度也比較低,說明Ⅰ類原油來源于營城組烴源巖;而Ⅱ類原油和營城組烴源巖差異明顯,營城組烴源巖不能作為Ⅱ類原油的來源,Ⅱ類原油來源于沙河子組烴源巖;Ⅲ類原油是由Ⅰ類原油和Ⅱ類原油混合而成,屬于營城組和沙河子組烴源巖聯(lián)合供給烴類。
[Abstract]:Located in the southern Songliao Basin faulted Southern Lishu fault depression basin, the hydrocarbon source rocks is good, there are a large number of oil and gas resources. The conventional geochemical methods and experimental analysis of biomarker compounds analysis using this method, in the Lishu rift in the lower Cretaceous Yingcheng formation hydrocarbon source rocks and crude oil were system research, combined with previous research results, to determine the geochemical characteristics of source rocks in Lishu fault depression, division of main source rocks, oil source correlation, for the exploration and development of Lishu fault depression is given to a theoretical basis for.1, with moderate good source rocks in the main hydrocarbon source of Yingcheng Group rocks in pear tree, also developed some high-quality hydrocarbon source rocks. The hydrocarbon source rocks are mainly distributed in the southwest Basin deep sag, sag and Ssangyong after five households - Xiaochengzi area developed good source rocks, eight houses mostly moderate to good hydrocarbon The source rocks, the northern slope of the geographical distribution of some moderate good source rock, Qinjiatun and skin source rocks are relatively poor. The development of regional source rock organic matter types are mainly type. The organic matter of source rock thermal evolution degree is mostly at the mature stage, some areas in high mature stage. In the above, the main hydrocarbon source rocks of Yingcheng Group distributed in five households after the deep concave Xiaochengzi West Zone of Lishu fault source of oil and gas.2, Yingcheng Formation source rocks second and eight house area Shuanglong sag is also important, faulted basin from the middle to the surrounding water salinity decreased continuously, also primary weakening. Lishu fault depression of organic matter in source rocks of Yingcheng Formation of dual sources, including terrestrial higher plants and low aquatic organisms, including terrestrial plants is relatively large contribution, is a typical development in rift basin source rocks. The sedimentary environment of source rocks is the most deep lake deep lake half Phase, deep water, reducing the relatively strong, and algae and higher plants are the main organic matter input; part of shallow lake facies (eight house area SN65 and SN118 wells), with shallow water, reducing the weak, source rock organic matter input to higher plants. Binhu; sedimentary environment is fluvial facies hydrocarbon source rock distribution in Shuanglong sag. The sedimentary environment with shallow water, reducing weak source rock organic matter input to higher plants.3 characters in Yingcheng Formation of lacustrine oil oil has Lishu fault, formed in the partial reduction of brackish water brackish water sedimentary environment, source of organic matter was mainly terrigenous higher plants, in addition to algae and bacteria and other biological n-alkanes. The distribution of C10~C38 integrity, the vast majority of unimodal, n-alkanes weight ratio nC21-/ nC22+ peak carbon mainly for the oil field C21. crude oil, CPI and OEP values are variable Little. Most of the crude oil of tricyclic terpane compounds showed a peak to the normal distribution of C23, long chain oil samples after C26 tricyclic terpane content is relatively high, showing the characteristics of "qiaoyiba" camp, gammacerane city group has a relatively high content of crude oil of each block of Lishu fault depression, crude gamma wax alkane /C30 hopane ratio distribution in the range of 0.33~1.10. Most of the crude oil in the mature stage, and the eight House in BK60 block and SN54 block the maturity of crude oil is higher than other regions of.4, according to the geochemical characteristics of crude oil, crude oil is divided into the following three types: the first type of crude oil C24 two tetracyclic triterpenoid /C26 tricyclene cetane value is 0.23~0.65, tricyclic terpane / three pentacyclic terpene value is 0.07~0.43, Ts = Tm, gammacerane /C30 hopane value is 0.16~0.42; class II oil C24 two tetracyclic triterpenoid /C26 tricyclic terpane value is 0.11~0.28, tricyclic terpane / five three terpene value 0.47~4.06, TsTm, /C30 and gammacerane hopanoic value is 0.42~1.10; the characteristics of class III oil in between the two generation, is mixed by.5, has the similar characteristics of steranes and terpanes of Yingcheng Formation of crude oil and source rocks in Yingcheng Formation of Lishu fault, C28 tricyclene alkyl and C29 tricyclic terpane abundances are relatively low, and the Ts C29Ts and C30 Tm abundance almost Diahopane abundance is relatively low, indicating type crude oil originates from the source rocks of Yingcheng Formation; type II crude oil and source rocks of Yingcheng Group is significantly different, Yingcheng Formation source rocks cannot be used as a source class II class II of crude oil, crude oil originates from the hydrocarbon source rock of Shahe sub group; class III oil is composed of class I and class II mixed crude oil and crude oil, which belongs to the Yingcheng Group and Shahe sub group of source rock joint supply of hydrocarbons.

【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】：2017
【分類號】：P618.13

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