海陆过渡相页岩气形成热模拟实验研究

发布时间：2018-08-23 13:57

【摘要】：晚古生代海陆过渡相泥页岩在中国南北方广泛分布,页岩气资源潜力巨大。应用生烃热模拟实验,对采集于鄂尔多斯盆地上古生界山西组山2段未成熟海陆过渡相富有机质页岩的页岩气形成过程进行研究。实验结果表明,山2段海陆过渡相页岩在实验最低温度(T=337.2℃,Ro=0.74%)时就生成液态烃和气态烃,在385.3℃(Ro=1.08%)时液态烃达到生成高峰,此后甲烷(CH_4)产率迅速增大,干燥系数开始变大;重烃气(C_(2-5))达到生成高峰(T=456.2℃,Ro=2.09%)时甲烷产率曲线出现拐点;甲烷主要由液态烃裂解形成,部分由重烃气裂解形成;在实验最高温度(T=599.7℃,Ro=4.45%)时甲烷产率达956.93mL/g_(TOC),干燥系数达99.75%,但仍有少量重烃气和液态烃可以继续裂解生成甲烷。山2段页岩气形成具有3个阶段,即337.2℃≤T≤385.3℃(0.74%≤Ro≤1.08%)为生油阶段,伴有少量页岩气形成;385.3℃T≤456.2℃(1.08%Ro≤2.09%)为油气共生阶段,页岩气以湿气为主;456.2℃T≤599.7℃(2.09%Ro≤4.45%)为生气阶段,页岩气以干气为主。海陆过渡相山2段页岩具有与海相Barnett页岩相似的气态烃形成过程,但是页岩气产率高。研究认为海陆过渡相山2段富有机质页岩具有页岩气勘探所需要的良好物质基础和生烃潜力。
[Abstract]:The late Paleozoic marine and continental transitional shales are widely distributed in the south and north of China, with great potential for shale gas resources. In this paper, the formation process of shale gas with organic matter rich in transitional facies of immature marine and continental facies in Shanxi formation of Shanxi formation of Upper Paleozoic in Ordos Basin was studied by means of hydrocarbon generation thermal simulation experiment. The experimental results show that at the lowest experimental temperature (T _ (337.2 鈩，

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