本文選題：天然氣類型 + 油氣源�。� 參考：《石油與天然氣地質(zhì)》2017年02期

【摘要】：塔中隆起寒武系碳酸鹽巖儲(chǔ)層油氣資源豐富,然而由于復(fù)雜的構(gòu)造地質(zhì)背景,油氣來(lái)源和天然氣類型還存在較大爭(zhēng)議。通過(guò)詳細(xì)分析ZS1井、ZS1C井和ZS5井寒武系不同層段中凝析油和天然氣的組成、碳同位素等特征,并結(jié)合寒武系-下奧陶統(tǒng)與中、上奧陶統(tǒng)烴源巖地球化學(xué)特征,對(duì)其油氣來(lái)源和天然氣成因類型進(jìn)行了判別。研究結(jié)果表明,該區(qū)天然氣為典型的腐泥型干酪根裂解氣,其中寒武系肖爾布拉克組天然氣干燥系數(shù)大于0.98,N2含量介于2.5%~4.0%,為過(guò)成熟干氣,且凝析油族組分與和飽和烴單體烴碳同位素偏重,nC_9—n C20碳同位素介于-28.8‰~-26.3‰,表明油氣來(lái)源為寒武系-下奧陶統(tǒng)烴源巖。而寒武系阿瓦塔格組和吾松格爾組天然氣干燥系數(shù)介于0.63~0.78,N2含量介于0.2%~0.8%,為低成熟濕氣,且凝析油族組分和飽和烴單體烴碳同位素相對(duì)較輕,nC_9—nC_(23)碳同位素介于-37.25‰~-32.56‰,表明油氣來(lái)源為中、上奧陶統(tǒng)烴源巖。
[Abstract]:Cambrian carbonate reservoirs in the Tazhong uplift are rich in oil and gas resources. However, due to the complicated tectonic geological background, the source of oil and gas and the types of natural gas are still controversial. The composition of condensate oil and natural gas, carbon isotopes in different Cambrian formations of ZS1 well ZS1C and ZS5 well are analyzed in detail, and the geochemical characteristics of Cambrian-Lower Ordovician and Middle Ordovician hydrocarbon source rocks are combined. The origin of oil and gas and the genetic type of natural gas are distinguished. The results show that the natural gas in this area is typical humic kerogen cracking gas, in which the natural gas drying coefficient of Cambrian Shaubrak formation is greater than 0.98N _ 2 and the content of N _ 2 is between 2.5 and 4.0, which is overmature dry gas. Moreover, the hydrocarbon isotopes of condensate group and saturated hydrocarbon monomers are between -28.8 鈥，

本文編號(hào)：1891306