Fluid Inclusions in Reservoirs of Weixinan Sag, Beibuwan Basin

详细信息   

• 责任者：Liu Ping （Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China） ; Xia Bin
• 刊名：Petroleum Exploration and Development
• 出版年：2008
• 卷期：35(2)
• 关键词：流体包裹体 ; fluid inclusions ; 油气藏形成 ; reservoir formation ; 南海 ; South China Sea
• 页码：p.164-169,200
• 图表：5 illus., 2 tables, 15 refs.
• 分类号：1003
• issnNo：ISSN1000-0747
• isbnNo：CN11-2360/TE

摘要

To make sure the petroleum migrating direction and pool-forming model in the Weixinan sag, 4 wells were chosen to do research on fluid inclusions and petrography. The petroleum inclusions have three types: type-Ⅰ occurs in early cracks of quartz debris grains or the overgrowths inside, type-Ⅱ in the margins or overgrowths of quartz grains, and type-Ⅲ in late cracks of quartz debris grains. According to PVTsim, Ptr and Ttr are modeled and calculated. The results are: type-Ⅰ is 97.9 ℃ and 19.13 MPa; type-Ⅱ 112.6 ℃ and 35.05 MPa; type-Ⅲ 157.4 ℃ and 47.52 MPa. Based on burial history, three fluid-charging events occurred about 33 Ma, 26.5 Ma and 7 Ma ago, respectively. Migration directions and pool-forming models are: Fluid type-Ⅰ migrated towards west-north and north-east respectively to form structural and lithologic reservoirs; Fluid type-Ⅱ migrated to areas surrounding the sag and formed block faulted and buried hill reservoirs; Fluid type-Ⅲ migrated to slopes to form anticlinal reservoirs.