Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China

论文摘要

The spatial-temporal relationship between high-quality source rocks and reservoirs is a key factor when evaluating the formation, occurrence, and prospectivity of tight oil and gas reservoirs. In this study, we analyze the fundamental oil and gas accumulation processes occurring in the Songliao Basin, contrasting tight oil sand reservoirs in the south with tight gas sand reservoirs in the north. This is done using geochemical data, constant-rate and conventional mercury injection experiments, and fluid inclusion analyses. Our results demonstrate that as far as fluid mobility is concerned, the expulsion center coincides with the overpressure zone, and its boundary limits the occurrence of tight oil and gas accumulations. In addition, the lower permeability limit of high-quality reservoirs, controlled by pore-throat structures, is0.1*10-3lm2 in the fourth member of the Lower Cretaceous Quantou Formation（K1q4） in the southern Songliao Basin, and 0.05 *10-3lm2 in the Lower Cretaceous Shahezi Formation（K1 sh） in the northern Songliao Basin. Furthermore, the results indicate that the formation of tight oil and gas reservoirs requires the densification of reservoirs prior to the main phase of hydrocarbon expulsion from the source rocks.Reservoir ‘‘sweet spots" develop at the intersection of high-quality source rocks（with high pore pressure）and reservoirs（with high permeability）.

论文目录

文章来源

类型: 期刊论文

作者: Laixing Cai,Guolin Xiao,Shuangfang Lu,Jiao Wang,Zhiqiang Wu

来源: International Journal of Mining Science and Technology 2019年03期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 石油天然气工业

单位: Qingdao Institute of Marine Geology,Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao),Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum (East China)

基金: supported by the National Natural Science Foundation of China (Nos. 41210005 and 41776081),the National Oil and Gas Major Project of China (No. 2011ZX05007-001),the Applied Basic Research Program of Qingdao (No. 2016239)

分类号: TE31

页码: 387-397

总页数: 11

文件大小: 1657K

下载量: 14

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