【摘要】：準(zhǔn)噶爾盆地含有豐富的油氣資源,南緣地區(qū)構(gòu)造復(fù)雜,勘探程度低,勘探潛力大。本文以準(zhǔn)噶爾盆地南緣西大龍口地區(qū)的蘆草溝組剖面為切入點(diǎn)對(duì)該地區(qū)烴源巖地球化學(xué) .特征進(jìn)行研究,通過(guò)有機(jī)地球化學(xué)特征探討了該地區(qū)蘆草溝組烴源巖的有機(jī)質(zhì)豐度、類型及成熟度方面的信息,利用生物標(biāo)志化合物和元素地球化學(xué)的方法對(duì)控制該地區(qū)烴源巖形成的古氣候、古鹽度及古水體氧化還原環(huán)境方面的因素進(jìn)行了分析,從而更好地為該地區(qū)油氣勘探提供依據(jù)。有機(jī)碳含量、氯仿瀝青“A”、有機(jī)碳同位素及類異戊二烯烷烴的Pr/n-C17和Ph/n-C18值參數(shù)表明研究區(qū)烴源巖有機(jī)質(zhì)豐度高、有機(jī)質(zhì)類型屬I-II型;生物標(biāo)志化合物參數(shù)表明研究區(qū)烴源巖有機(jī)質(zhì)母質(zhì)來(lái)源主要為藻類等低等水生生物,湖盆水體中含量高的P元素為藻類的繁殖提供了營(yíng)養(yǎng)物質(zhì),加上較溫暖濕潤(rùn)的古氣候條件,促使藻類大量繁殖,為優(yōu)質(zhì)烴源巖的形成提供了物質(zhì)基礎(chǔ);研究區(qū)烴源巖有機(jī)質(zhì)成熟度并不高,生物標(biāo)志化合物成熟度參數(shù)表明研究區(qū)蘆草溝組烴源巖基本處于低成熟-中等成熟度階段;生物標(biāo)志化合物參數(shù)和微量、稀土元素參數(shù)綜合分析表明,研究區(qū)烴源巖形成于水體中氧氣量適中的弱氧化-弱還原環(huán)境,水體中鹽度較高從而導(dǎo)致還原環(huán)境增強(qiáng)。
[Abstract]:Junggar Basin is rich in oil and gas resources. The southern margin of Junggar Basin is characterized by complex structure, low exploration degree and great exploration potential. Based on the Luchaogou formation section in the west Dalong mouth area of the southern margin of Junggar Basin, the source rock geochemistry in this area is studied. Based on the organic geochemical characteristics, the information on the abundance, type and maturity of organic matter in the source rocks of the Luchaogou formation in this area is discussed. The factors controlling the paleoclimate, paleosalinity and redox environment of the source rocks in this area are analyzed by means of biomarker compounds and element geochemistry, so as to provide a better basis for oil and gas exploration in this area. The organic carbon content, chloroform bitumen "A", organic carbon isotope and the Pr/n-C17 and Ph/n-C18 values of isoprene alkanes indicate that the organic matter abundance of source rocks in the study area is high, and the organic matter type belongs to I-II type. The biomarker parameters indicated that the source material of organic matter of source rock in the study area was mainly algae and other low aquatic organisms, and the high content of P in the lake basin provided nutrients for algae propagation, plus warm and humid paleoclimate conditions. To promote the algae to multiply in large quantities, which provides the material basis for the formation of high quality hydrocarbon source rock. The maturity of organic matter of source rocks in the study area is not high, and the maturity parameters of biomarkers indicate that the source rocks of the Luchaogou formation in the study area are basically in the stage of low maturation to medium maturity. The comprehensive analysis of biomarker parameters and trace and rare earth element parameters shows that the hydrocarbon source rocks in the study area were formed in the weak oxidation-weak reduction environment with moderate oxygen content in the water body, and the salinity in the water body was relatively high, which led to the enhancement of the reduction environment.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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本文編號(hào)：2412306