江苏天然气藏及成藏模式

NATURAL GAS RESERVOIRS IN JIANGSU PROVINCE AND THEIR FORMATION MODELS

江苏现有气显示井 1 48口 ,其中工业气井 2 6口 ,产气层 1 0个 ,气藏 1 8个。按气源可将气藏划分为三类 :属生物气—低温热解气藏类型的有刘庄下第三系阜宁组二段、黄珏三垛组一段等两个气藏 ;属油型伴生气—凝析气藏类型的有周庄下第三系下盐城组二段、许庄三垛组一段、富民庄戴南组一段等九个气藏 ;属于多源混合型气藏类型的有富民庄下第三系三垛组一段、小纪泰州组一段、黄桥下盐城组二段等七个气藏。根据江苏 1 8个气藏的现有资料 ,从气源、储层、封盖圈闭等方面进行分析比较 ,建立起不同成因类型的三种成藏模式 :①“刘庄式”自生自储型生物气成藏模式 ;②“永安式”下生上储型热解气成藏模式 ;③“黄桥式”有机气和幔源气混合成藏模式。

There are 148 gas showing wells(including 26 commercial gas wells),10 gas producing formations and 18 gas resrvoirs in Jiangsu Province at present.According to various gas sources,the gas reserovirs can be divided into three categories.i.e. two biogas low temperature pyrolysis gas reservoirs as the second member reservoir of Funing Formation and the first member reservoir of Sanduo Formation,Paleogene,found at Liuzhuang and Huangjue respectively;nine oil formed associated gas condensate gas reservoirs as the second member reservoir of Lower Yancheng Formation,the first member reservoir of Sanduo Formation and the first member reservoir of Dainan Formation,Paleogene,etc.,found at Zhouzhuang,Xuzhuang and Fuminzhuang,etc.,respectively;and seven multisource mixed gas reservoirs as the first member reservoir of Sanduo Formation,the first member reservoir of Taizhou Formation,Upper Cretaceous,and the second member reservoir of Lower Yancheng Formation,etc.,found at Fuminzhuang,Xiaoji and Huangqiao,etc.,respectively.In light of the data on existent eighteen gas reservors,three gas reservoir formation models were set up through analyzing and contrasting gas sources,reservoir beds,caprocks and traps,etc.,including①Liuzhuang Model—self generating and self storing biogas reservoirs;②Yong′an Model—bottom generating and top storing pyrolysis gas reservoirs;and ③Huangqiao Model—mixed organic genetic gas mentle source gas reservoirs.