准噶尔盆地南缘侏罗系煤生烃热模拟实验研究  

Thermal Simulation Experiment for Hydrocarbon Generation:A Case Study of Jurassic Coal from the Southern Margin of Junggar Basin

作　　者：李二庭 马万云 李际 马新星 潘长春[4] 曾立飞 王明 LI Erting;MA Wanyun;LI Ji;MA Xinxing;PAN Changchun;ZENG Lifei;WANG Ming(Xinjiang Laboratory of Petroleum Reserve in Conglomerate,Karamay,Xinjiang 834000,China;Research Institute of Experiment and Testing,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China;Xinjiang Yucheng Heating Power Company Limited,Karamay,Xinjiang 834000,China;State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong 510640,China)

机构地区：[1]新疆砾岩油藏实验室,新疆克拉玛依834000 [2]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000 [3]新疆宇澄热力股份有限公司,新疆克拉玛依834000 [4]中国科学院广州地球化学研究所,广东广州510640

出　　处：《现代地质》2022年第5期1313-1323,共11页Geoscience

基　　金：国家油气重大专项(编号:2016ZX05041-005-003)资助

摘　　要：采用黄金管-高压釜热模拟体系,开展准噶尔盆地南缘地区侏罗系八道湾组和西山窑组煤的生油和生气演化特征研究,对区域油气资源评价和油气资源研究具有重要意义。煤热模拟实验结果表明,准噶尔盆地南缘八道湾组煤生油潜力明显高于西山窑组煤,其生油高峰在Ro(镜质体反射率)=1.07%,最大生油产率的分布范围为60.13~83.27 mg/g,具有一定的排油能力;西山窑组煤生油高峰在Ro=0.96%,最大生油产率分布范围为27.14~62.14 mg/g,部分样品具有一定的排油能力。八道湾组煤和西山窑组煤生气能力接近且均较好,生气窗长。Ro为0.90%时,煤开始生气;Ro在1.07%~1.65%时,煤进入快速生湿气阶段,煤裂解气产量是最大产气量的50%左右;Ro达1.65%后,煤进入干酪根裂解生气阶段;Ro在3.60%时,煤生气基本结束,最大生气产率分布范围为92.23~141.26 mg/g。南缘西段艾卡构造带八道湾组煤层厚度为10~20 m,Ro在1.0%左右,处于煤生油高峰,生油量在57.10~81.19 mg/g,且煤具有有机碳含量高的特点,认为该区煤具有形成带气顶的油藏的潜力。准噶尔盆地南缘中段霍玛吐背斜带和昌吉—乌鲁木齐地区侏罗系煤层厚度大,最厚达60 m,烃源岩Ro在1.3%~2.0%之间,处于煤大量生干气阶段,生气量为60.21~104.27 mg/g,认为准噶尔盆地南缘中段煤具有形成凝析气藏和干气藏的条件。Gold tube-autoclave thermal simulation system was used to study the generation and evolution of oil and gas from the coal(Badaowan and Xishanyao formations)in the southern margin of Junggar Basin.It is of great significance for the oil-gas resource evaluation and source study in the southern basinal margin.Thermal simulation experiment of coal shows that the oil generation potential of the Badaowan Formation coal is significantly higher than that of the Xishanyao Formation coal.The maximum oil yield of Badaowan and Xishanyao Formation coal is 60.13-83.27 mg/g(Ro(vitrinite reflectance)=1.07%)and 27.14-62.14 mg/g(Ro=0.96%),respectively.The gaseous hydrocarbon yields of Badaowan and Xishanyao Formation coal are similar,both having high gas generation potential and wide gas generation window.At Ro=0.90%,coal starts to crack into gas.At Ro=1.07%-1.65%,coal is in the rapid moisture generation stage,and the gas yield is about 50%of the maximum gas yield.At Ro>1.65%,coal is in the stage of kerogen crack into dry gas.At Ro=3.60%,gas generation by coal is basically over,and the maximum gas yield of 92.23-141.26 mg/g.The thickness of Badaowan Formation coal seam in the Aika structural belt in the western part of the southern margin is 10-20 m,and Ro=~1.0%.The local coal is at the peak of oil generation,with the oil yield being 57.10-81.19 mg/g.Moreover,the organic carbon content of coal is high.Therefore,we considered that the local coal has potential to form oil reservoirs with gas caps.Jurassic coal seams in the Huomatu anticline and Changji-Urumqi area in the middle section of the southern margin are thick(up to 60 m),with its Ro=1.3%-2.0%.The local coal is in the dry gas generation stage,with gas yield of 60.21-104.27 mg/g.Based on the above analysis,we suggested that the coal in the middle section of the southern basinal margin has potential to form condensate gas reservoirs and dry gas reservoirs.

关 键 词：煤 天然气 热模拟 准噶尔盆地 液态烃 碳同位素 

分 类 号：P618.1[天文地球—矿床学] TE122.1[天文地球—地质学]