鄂尔多斯盆地三叠系陆相页岩含气性及页岩气赋存状态

发布时间：2018-04-19 23:20

本文选题：鄂尔多斯盆地 + 三叠系　；参考：《东北石油大学学报》2016年02期

【摘要】：鄂尔多斯盆地三叠系陆相页岩具有高黏土矿物质量分数(41.4%)、高有机碳质量分数(3.0%~7.0%)、低热演化程度(0.5%~1.4%)、低孔隙度(1.0%~3.0%)、低渗透率(低于0.05×10-3μm2)和强非均质性等特点,页岩含气性及页岩气赋存状态成为资源评价的关键。基于页岩生气模拟实验,获得研究区页岩生气过程、天然气累计转化率及生气总量;基于甲烷等温吸附实验及现场解析实验,完成页岩对甲烷的吸附能力及页岩气总含气量测试。结果表明,鄂尔多斯盆地三叠系延长组页岩生气时期为距今130~90Ma,生气高峰期为距今100Ma,CH4及C2~C5的累计转化率分别为35%及71%,烃类气体总产率为53.5mL/gTOC,页岩总生气量在1.23~4.01m3/t之间,平均可达2.30m3/t,页岩对甲烷的吸附能力在1.04~3.20m3/t之间,平均为1.96m3/t,现场解析气(不含损失气)含量在1.20~1.90m3/t之间,平均为1.61m3/t。研究区页岩气以吸附态为主,含少量游离态及溶解态天然气,页岩总含气量为1.96~2.30m3/t。
[Abstract]:The Triassic terrestrial shale in Ordos Basin is characterized by high clay mineral mass fraction (41.4), high organic carbon mass fraction (3.0%) and high organic carbon mass fraction (3.0%), low thermal evolution degree (0.5%), low porosity (1.0%), low permeability (less than 0.05 脳 10 -3 渭 m 2) and strong heterogeneity. Shale gas bearing and shale gas occurrence are the key to resource evaluation. Based on the shale gas simulation experiment, the shale gas generation process, the cumulative conversion rate and the total amount of gas generated in the study area are obtained; based on the methane isothermal adsorption experiment and the field analysis experiment, The adsorption capacity of shale to methane and the total gas content of shale gas were tested. The results show that the shale gas generation period of the Triassic Yanchang formation in Ordos Basin is 130 ~ 90 Ma, the accumulative conversion rate of 100 Ma Ch _ 4 and C2~C5 are 35% and 71%, respectively, the total hydrocarbon gas production rate is 53.5 mL / g _ (t) C, and the total shale gas generation rate is between 1.23~4.01m3/t. The average adsorption capacity of shale to methane is between 1.04~3.20m3/t and 1.96m3 / t, and the content of field analytical gas (excluding loss gas) is between 1.20~1.90m3/t and 1.61m3 / t. The shale gas in the study area is mainly adsorbed, with a small amount of free and dissolved natural gas, and the total gas content of shale is 1.96 ~ 2.30 m ~ (3 / t).
【作者单位】：陕西延长石油(集团)有限责任公司研究院;陕西延长石油(集团)有限责任公司资源与勘探开发部;
【基金】：国家高技术研究发展计划(863计划)项目(2013AA064501) 陕西省科技统筹创新工程项目(2012KTZB03-03-01)
【分类号】：P618.13

【相似文献】