摘要
国内外页岩油开发实践表明,自然成熟的页岩油高产区对应的页岩成熟度主要处于中—高成熟阶段。而中国广泛发育的中生界—新生界页岩的成熟度相对较低,不适宜页岩油的直接开发,只能通过原位加热方式进行开发。以鄂尔多斯盆地三叠系延长组7段(长7段)和松辽盆地白垩系青山口组1段(青1段)典型低熟页岩样品为研究对象,进行了升温速率为20℃/d的原位加热至450℃的模拟实验。实验结果表明:长7段和青1段低熟页岩通过原位加热产页岩油气特征有比较大的差别。长7段页岩通过原位加热页岩油的最大产率(以单位页岩为标准)为43.94 kg/t,青1段页岩原位加热页岩油的最大产率只有10.50 kg/t;相应的页岩气产率分别为15.68 m^(3)/t和3.73 m^(3)/t。两种页岩样品产页岩油的主要温度区间均为380~410℃,410℃以前的页岩油产率占最大产率的91.88%和75.71%。两种页岩样品原位加热产出的页岩油主要为轻质油,产油温度区间原油主峰碳数为C9—C10。对于页岩油的分子组成,青1段页岩原位加热所产页岩油中含有更多的甲基芳香烃和轻质二甲基环烷烃。而对页岩油气开发方案和开发工艺影响比较大的不同成分酸性气体产率明显不同。长7段页岩模拟产生的H2及H2S明显比青1段页岩高,而青1段页岩模拟产生的CO_(2)产率则是长7段页岩的1.84倍。虽然长7段页岩有机质类型相对较差,但有机质含量更高,单位质量页岩原位加热产页岩油量和天然气量都是青1段页岩的4~5倍。因此,长7段页岩比青1段页岩原位加热开发页岩油气的效率更高。
The domestic and overseas development practice of shale oil shows that in the high-yield area of naturally matured shale oil,shale is mainly in the medium-high mature stage.Mesozoic and Cenozoic shale is widespread in China,with lower maturity;the shale oil is not suitable to be exploited directly but only through in-situ heating.Taking the typical low-mature shale sample from the Triassic Member 7 of Yanchang Formation in Ordos Basin(Chang-7 for short)and Cretaceous Member 1 of Qingshankou Formation in Songliao Basin(Qing-1 for short)as the study object,a simulation experiment of in-situ heating to 450℃was performed at the heating rate of 20℃/d.The experimental results show that there is a big difference between the characteristics of Chang-7 and Qing-1 low-mature shale oil produced by in-situ heating.Through in-situ heating,Chang-7 shale has obtained the maximum oil yield of 43.94 kg/t,and Qing-1 has achieved the maximum oil yield of 10.50 kg/t;accordingly,the shale gas yield is 15.68m3/t and 3.73m3/t.The main temperature range of the two samples for producing shale oil is between 380℃and 410℃;the yield of shale oil before 410℃accounts for 91.88%and 75.71%of the maximum yield.The shale oil produced by in-situ heating of the two shale samples is mainly light oil;the peak carbon number of crude oil within the temperature range for oil production is C9-C10.As for the molecular components of shale oil,the shale oil produced through in-situ heating of Qing-1 shale contain more methyl aromatics and light dimethyl cycloalkanes.However,there is an obvious difference in the yield of acid gas with different components,which has a great impact on the development scheme and process of shale oil.H2 and H2S produced through Chang-7 shale simulation are higher than those of Qing-1 shale,while the CO2 yield of Qing-1 shale is 1.84 times that of Chang-7 shale.Although the organic matter type of Chang-7 shale is not good,the content of organic matter is higher.The volumes of shale oil and gas produced by in-situ heatin
作者
卢梦蝶
李贤庆
米敬奎
翟佳
罗东旭
Lu Mengdie;Li Xianqing;Mi Jingkui;Zhai Jia;Luo Dongxu(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing 100083,China;College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Laboratory of Petroleum Geological Sciences,PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2023年第5期765-777,共13页
Acta Petrolei Sinica
基金
国家自然科学基金面上项目“鄂尔多斯盆地延长组中低成熟度页岩原位转化生油动力学机制及最佳温压条件研究”(No.42172170)
中央高校基本科研业务费专项资金项目“页岩油气成藏条件与储层特征”(2020YJSMT02,2021YJSMT09)资助。
关键词
低熟页岩
长7段页岩
青1段页岩
原位加热
产油温度区间
页岩油气产率
low-mature shale
Member 7 of Yanchang Formation shale
Member 1 of Qingshankou Formation shale
in-situ heating
oil producing temperature range
shale oil and gas yields
