發(fā)布時(shí)間：2018-09-10 20:59

【摘要】：通過(guò)對(duì)黃河口東洼古近系3套烴源巖的巖石熱解、抽提物飽和烴、芳烴(GC/MS)分析,研究烴源巖的地球化學(xué)特征,指出優(yōu)質(zhì)烴源巖發(fā)育層段,并對(duì)其形成的控制因素進(jìn)行分析。結(jié)果表明:黃河口東洼沙三段、沙一二段和東下段存在有機(jī)質(zhì)豐度高、類(lèi)型好、生烴能力強(qiáng)的優(yōu)質(zhì)烴源巖。其中沙三段烴源巖厚度大,有機(jī)質(zhì)豐度最高,類(lèi)型最好,主要為Ⅱ1和Ⅰ型,且已進(jìn)入生烴門(mén)限,優(yōu)質(zhì)烴源巖最為發(fā)育;沙一二段烴源巖次之,有機(jī)質(zhì)豐度較高,類(lèi)型較好,主要為Ⅱ1型,優(yōu)質(zhì)烴源巖較為發(fā)育;東下段烴源巖相對(duì)較差,有機(jī)質(zhì)豐度主要達(dá)到好烴源巖的標(biāo)準(zhǔn),有機(jī)質(zhì)類(lèi)型主要為Ⅱ2型,有機(jī)質(zhì)豐度和類(lèi)型相對(duì)前兩者差一些。構(gòu)造和古氣候、湖盆古生產(chǎn)力及有機(jī)質(zhì)保存條件控制烴源巖發(fā)育,沙三段沉積時(shí)期氣候炎熱濕潤(rùn),大量的藻類(lèi)輸入形成較高的生產(chǎn)力水平,半深湖—深湖還原環(huán)境使有機(jī)質(zhì)的保存條件良好,有機(jī)質(zhì)含量整體較高。沙一二段沉積時(shí)期氣溫有所降低,藻類(lèi)勃發(fā),具有較高的古生產(chǎn)力,低Pr/Ph、高伽馬蠟烷/C30藿烷反映水體鹽度較高,沉積環(huán)境為缺氧的強(qiáng)還原環(huán)境,對(duì)有機(jī)質(zhì)的保存極為有利。東下段沉積時(shí)期氣候溫暖半濕潤(rùn),母質(zhì)來(lái)源構(gòu)成上以混源為主,但陸源高等植物輸入更多,沉積環(huán)境主要為淡水還原環(huán)境,總體上古生產(chǎn)力水平和有機(jī)質(zhì)保存條件相對(duì)前兩者較差,整體有機(jī)質(zhì)含量偏低,有機(jī)質(zhì)類(lèi)型偏差。
[Abstract]:Based on the analysis of rock pyrolysis, saturated hydrocarbons and aromatic hydrocarbons (GC/MS) of three sets of source rocks of the Paleogene in Dongwa, Huanghe River estuary, the geochemical characteristics of source rocks are studied, and the developing strata of high quality source rocks are pointed out, and the controlling factors of their formation are analyzed. The results show that there are high quality hydrocarbon source rocks with high organic matter abundance, good type and strong hydrocarbon generation ability in the third member of Dongwa Sha formation, the second member of Sha 1 and the lower part of East part of the Yellow River Estuary. Among them, the source rocks of the third member of the Shahejie formation have the largest thickness, the highest abundance of organic matter and the best types, mainly of type 鈪，

本文編號(hào)：2235601