四川盆地川西坳陷新场气田上三叠统须家河组五段烃源岩评价

发布时间：2018-02-04 02:44

  本文关键词： 川西坳陷 新场气田 须家河组五段 烃源岩 有机地球化学特征 生气强度　出处：《天然气地球科学》2017年11期 　论文类型：期刊论文

【摘要】：上三叠统须家河组五段是四川盆地川西坳陷新场气田陆相天然气勘探的重点层系之一,但对须五段烃源岩品质的研究程度较低且认识存在分歧。对新场须五段泥岩发育特征和有机地球化学特征研究表明,新场须五段泥岩平均厚度为285.3m,各亚段均表现出北薄南厚的特征。须五段泥岩样品TOC含量、生烃潜力(S_1+S_2)和氯仿沥青"A"含量平均分别为2.17%、2.26mg/g和0.264‰,有机质丰度整体达到了中等烃源岩的标准;干酪根类型指数(TI)均小于0,δ~(13) C平均值为-25.0‰,有机质类型主要为腐殖型和腐泥—腐殖型;镜质体反射率(RO)平均值为1.17%,主体处于生油高峰期后。新场须五段泥岩生气强度主体介于(3~16)×10~8 m~3/km~2之间,具备形成中小型气田的资源基础。新场须五段泥岩总生气量相对较低,生成的天然气无法完全驱替掉地层中的水,因此气藏中天然气充满度整体偏低,导致在试采过程中气水同产且天然气产量整体较低。
[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，

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