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库车坳陷迪北地区阿合组和阳霞组致密砂岩储层孔隙微观结构差异及其地质意义(学报约稿) |
Difference in pore microstructure of tight-sand reservoirs in Ahe and Yangxia Formations at Dibei area in Kuqia Depression and its geological significance |
投稿时间:2022-11-04 修订日期:2022-11-04 |
DOI: |
中文关键词: 阳霞组 阿合组 致密砂岩储层 孔隙微观结构 迪北地区 库车坳陷 |
英文关键词: Yangxia Formation Ahe Formation tight-sand reservoir pore microstructure Dibei area Kuqa Depression |
基金项目:国家油气科技重大专项“致密气资源潜力评价、富集规律与有利区带优选”(课题编号2016ZX05047-001) |
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中文摘要: |
为了明确库车坳陷迪北地区下侏罗统阳霞组和阿合组致密砂岩储层孔隙微观结构对致密砂岩气富集的控制作用,针对孔隙微观结构特征不清楚的问题,综合激光共聚焦图像分析、压汞实验和束缚水饱和度测试等开展了阳霞组和阿合组致密砂岩储层物性、孔隙类型及孔隙微观结构等方面的对比研究,明确了两套储层的孔隙微观结构差异,并结合包裹体发育特征探讨储层微观结构差异对致密气富集的控制作用。研究结果表明:(1)阳霞组储层平均孔隙度5.68%,阿合组储层平均孔隙度5.95%,储层均以次生孔隙-裂缝组合为主,(2)与阳霞组致密储层相比,阿合组致密砂岩储层具有较大的孔径、喉道半径和孔喉比及较低的束缚水饱和度,说明阿合组储集能力和连通性更好;(3)阿合组石英颗粒内气态烃类包裹体密度比阳霞组石英颗粒中气态烃类包裹体丰度高,即阿合组致密砂岩储层孔隙微观结构比阳霞组储层孔隙微观结构好,更有利于致密砂岩气的聚集成藏。以上成果认识对于认识致密砂岩气富集规律具有一定的指导意义。 |
英文摘要: |
The tight-sand intervals of the Lower Jurassic Yangxia and Ahe in the Dibei area of Kuqa Depression are both typical low porosity and low permeability reservoirs, but their difference in pore microstructure is relatively less studied. Pore types and physical properties of Yangxia and Ahe tight-sand reservoirs as well as their differences in pore microstructure were compared using laser confocal image analysis, mercury injection method and irreducible water saturation measurement, while the impact of reservoir microstructure on tight gas accumulation is discussed with the observations of inclusion development. Results show that the porosity of Yangxia and Ahe reservoirs is 5.68% and 5.95%, respectively, where secondary pore-fracture assemblage is the main storage space within both sets of reservoirs. The pore size, throat radius and pore throat ratio of the Ahe tight-sand reservoir are larger than those in Yangxia tight-sand reservoir, which indicates that the former has good storage and connection capacity. The density of gaseous hydrocarbon inclusions in the quartz grains of the Ahe tight-sand reservoir is higher than that in the Yangxia tight-sand reservoir, which indicates that the microstructure of the Ahe tight reservoir is more conducive to the tight-sand gas accumulation. The above results can provide insight into understanding tight gas enrichment. |
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