【摘要】：晚古生代海陸過渡相泥頁巖在中國南北方廣泛分布,頁巖氣資源潛力巨大。應用生烴熱模擬實驗,對采集于鄂爾多斯盆地上古生界山西組山2段未成熟海陸過渡相富有機質(zhì)頁巖的頁巖氣形成過程進行研究。實驗結果表明,山2段海陸過渡相頁巖在實驗最低溫度(T=337.2℃,Ro=0.74%)時就生成液態(tài)烴和氣態(tài)烴,在385.3℃(Ro=1.08%)時液態(tài)烴達到生成高峰,此后甲烷(CH_4)產(chǎn)率迅速增大,干燥系數(shù)開始變大;重烴氣(C_(2-5))達到生成高峰(T=456.2℃,Ro=2.09%)時甲烷產(chǎn)率曲線出現(xiàn)拐點;甲烷主要由液態(tài)烴裂解形成,部分由重烴氣裂解形成;在實驗最高溫度(T=599.7℃,Ro=4.45%)時甲烷產(chǎn)率達956.93mL/g_(TOC),干燥系數(shù)達99.75%,但仍有少量重烴氣和液態(tài)烴可以繼續(xù)裂解生成甲烷。山2段頁巖氣形成具有3個階段,即337.2℃≤T≤385.3℃(0.74%≤Ro≤1.08%)為生油階段,伴有少量頁巖氣形成;385.3℃T≤456.2℃(1.08%Ro≤2.09%)為油氣共生階段,頁巖氣以濕氣為主;456.2℃T≤599.7℃(2.09%Ro≤4.45%)為生氣階段,頁巖氣以干氣為主。海陸過渡相山2段頁巖具有與海相Barnett頁巖相似的氣態(tài)烴形成過程,但是頁巖氣產(chǎn)率高。研究認為海陸過渡相山2段富有機質(zhì)頁巖具有頁巖氣勘探所需要的良好物質(zhì)基礎和生烴潛力。
[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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