發(fā)布時間：2018-08-19 14:39

【摘要】：對準(zhǔn)噶爾盆地東部侏羅系烴源巖有機地球化學(xué)特征進行了研究,結(jié)果顯示準(zhǔn)噶爾盆地東部侏羅系烴源巖有機碳含量分布范圍廣泛,TOC為0.13%~81.06%,烴源巖評價為差—中等生油潛力,但生氣潛力較大;鏡質(zhì)體反射率Ro分布和與熱演化程度相關(guān)的生物標(biāo)志化合物參數(shù)(OEP值、CPI值、甾烷和藿烷異構(gòu)化參數(shù)、甲基菲指數(shù)等)表明大多數(shù)烴源巖處于未成熟—低成熟熱演化階段;有機質(zhì)類型以III型為主,部分八道灣組和西山窯組烴源巖為II2型。此外,對準(zhǔn)噶爾盆地東部侏羅系天然氣組分和碳同位素組成分析結(jié)果表明,侏羅系天然氣以烴類氣體為主,甲烷含量為65%~98%,C1/C1-5為0.62~0.98,以濕氣為主,碳同位素組成分布范圍較廣,其中甲烷同位素組成δ13 C1值為-50.7‰~-28.2‰,乙烷δ13 C2為-32.5‰~-23.7‰,丙烷δ13 C3值為-30.6‰~-21.6‰,以煤型氣為主,僅三臺—北三臺地區(qū)天然氣顯示為油型氣-煤型氣混合的特征。在對準(zhǔn)噶爾盆地東部地區(qū)侏羅系煤系烴源巖和天然氣樣品分析的基礎(chǔ)上,通過與吐哈盆地典型低熟氣區(qū)烴源巖和天然氣地球化學(xué)特征對比認(rèn)為準(zhǔn)噶爾盆地東部阜東和三臺—北三臺地區(qū)已形成一定規(guī)模的低熟氣聚集,具有巨大的勘探潛力,是準(zhǔn)噶爾盆地低熟氣有望取得突破的重點地區(qū)。
[Abstract]:The organic geochemical characteristics of Jurassic source rocks in the eastern Junggar Basin are studied. The results show that the organic carbon content of Jurassic source rocks in the eastern Junggar Basin is widely distributed in the range of 0.13 and 81.06, and the source rocks are evaluated as poor to moderate oil generation potential. The distribution of vitrinite reflectance Ro and the parameters of biomarker related to the degree of thermal evolution (OEP), sterane and hopane isomerization parameters, The methyl phenanthrene index shows that most of the source rocks are in the immature to low mature thermal evolution stage, and the organic matter type is mainly III type, while some of the Badaowan and Xishanyao formation source rocks are of II2 type. In addition, the analysis of natural gas composition and carbon isotopic composition of Jurassic in the eastern Junggar Basin shows that the natural gas of Jurassic is mainly hydrocarbon gas, and the methane content is 65 ~ (98) C _ (1 / C _ (1-5) = 0.620.98). The main gas is wet gas, and the distribution range of carbon isotopic composition is relatively wide. The 未 13C1 value of methane isotopic composition is -50.7 鈥，

本文編號：2191956