塔西南坳陷山前帶天然氣地球化學(xué)特征和成因
發(fā)布時(shí)間：2018-04-09 08:39
本文選題：塔西南坳陷山前帶 切入點(diǎn)：碳?xì)渫凰?/strong> 出處：《中國(guó)礦業(yè)大學(xué)學(xué)報(bào)》2017年01期
【摘要】：阿克莫木氣藏,柯克亞—柯東氣藏天然氣地化特征差異明顯,天然氣類型及氣源巖一直存在爭(zhēng)議.通過(guò)對(duì)塔西南坳陷山前帶天然氣穩(wěn)定碳?xì)渫凰丶拜p烴組成特征的分析,研究了天然氣成因類型,并在此基礎(chǔ)上,進(jìn)行了氣源對(duì)比,明確了氣源巖類型.綜合運(yùn)用輕烴三角圖版、穩(wěn)定碳同位素圖版、Mango參數(shù)、Whiticar圖版及碳?xì)渫凰貓D版,認(rèn)為阿克莫木氣藏為來(lái)自于下侏羅統(tǒng)的煤成氣,柯克亞—柯東氣藏為來(lái)自于石炭系及侏羅系混源成因的天然氣.研究結(jié)果表明:阿克莫木氣藏干燥系數(shù)接近1,δ~(13)C_1值為-24.2‰~-23.3‰,是塔西南坳陷山前帶最重的,為來(lái)源單一的煤成氣;而柯克亞—柯東氣藏干燥系數(shù)均小于0.90,且存在單項(xiàng)性碳同位素倒轉(zhuǎn),為混源成因的濕氣.前者氣源巖主要為下侏羅統(tǒng)康蘇組,干酪根以Ⅲ型為主;后者氣源巖為石炭系,同時(shí)混有侏羅系氣源巖,干酪根以Ⅱ-Ⅲ型為主.阿克莫木氣藏苯的體積分?jǐn)?shù)高達(dá)31.10%~37.38%,甲苯的體積分?jǐn)?shù)為9.63%~13.46%,天然氣成熟度遠(yuǎn)大于柯克亞—柯東氣藏.
[Abstract]:The geochemical characteristics of natural gas in Akimomu gas reservoir and Kekeya-Kedong gas reservoir are obviously different, and the types and source rocks of natural gas have always been controversial.Based on the analysis of stable hydrocarbon isotopes and light hydrocarbon composition characteristics of natural gas in the mountain front zone of southwest depression of Tarim Basin, the genetic types of natural gas are studied. On this basis, gas source correlation is carried out, and the types of gas source rocks are defined.Using light hydrocarbon triangle plate, stable carbon isotope map plate and Mango parameter Whiticar map and hydrocarbon isotope map plate, it is considered that Akmo gas reservoir is coal-formed gas from lower Jurassic.Kekeya-Kedong gas reservoir is a natural gas from Carboniferous and Jurassic mixed origin.The results show that the drying coefficient of Akimo gas reservoir is close to 1, and the 未 ~ (13) C _ (-1) value is -24.2 鈥，
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