本文關(guān)鍵詞： 川西坳陷 新場氣田 須家河組五段 烴源巖 有機地球化學(xué)特征 生氣強度　出處：《天然氣地球科學(xué)》2017年11期 　論文類型：期刊論文

【摘要】：上三疊統(tǒng)須家河組五段是四川盆地川西坳陷新場氣田陸相天然氣勘探的重點層系之一,但對須五段烴源巖品質(zhì)的研究程度較低且認識存在分歧。對新場須五段泥巖發(fā)育特征和有機地球化學(xué)特征研究表明,新場須五段泥巖平均厚度為285.3m,各亞段均表現(xiàn)出北薄南厚的特征。須五段泥巖樣品TOC含量、生烴潛力(S_1+S_2)和氯仿瀝青"A"含量平均分別為2.17%、2.26mg/g和0.264‰,有機質(zhì)豐度整體達到了中等烴源巖的標準;干酪根類型指數(shù)(TI)均小于0,δ~(13) C平均值為-25.0‰,有機質(zhì)類型主要為腐殖型和腐泥—腐殖型;鏡質(zhì)體反射率(RO)平均值為1.17%,主體處于生油高峰期后。新場須五段泥巖生氣強度主體介于(3~16)×10~8 m~3/km~2之間,具備形成中小型氣田的資源基礎(chǔ)。新場須五段泥巖總生氣量相對較低,生成的天然氣無法完全驅(qū)替掉地層中的水,因此氣藏中天然氣充滿度整體偏低,導(dǎo)致在試采過程中氣水同產(chǎn)且天然氣產(chǎn)量整體較低。
[Abstract]:The fifth member of the Xujiahe formation of the Upper Triassic is one of the key strata in the exploration of continental natural gas in Xinchang gas field in the West Sichuan Depression, Sichuan Basin. However, the quality of the source rocks in the fifth member of Xujiao formation is low and the understanding is different. The study on the characteristics of mudstone development and organic geochemistry of the fifth member of Xinchang formation shows that the average thickness of the mudstone in the fifth member of Xinchangxu formation is 285.3 m. The TOC content of mudstone samples and hydrocarbon generation potential of S _ 1 S _ 2) and chloroform asphalt "A" were 2.17%, respectively. 2.26mg / g and 0.264 鈥，

本文編號：1489090