Geochemistry of formation water and its implication on overpressured fluid flow in the Dongying Depression of the Bohaiwan Basin, China

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• 作者：Xinong Xie ; Zhonghai Fan ; Xiaofeng Liu and Yongchao Lu
• 关键词：Total dissolved solid of formation water ; Fluid flow ; Tertiary ; Dongying Depression
• 刊名：Journal of Geochemical Exploration
• 出版年：2006
• 出版时间：April-June 2006
• 年：2006
• 卷：89
• 期：1-3
• 页码：432-435
• 全文大小：325 K

文摘

This study of the geochemistry of formation waters in the Dongying Depression of the Bohaiwan basin, East China, unravels a close relationship between vertical zonality and overpressured fluid flow. The zones have distinctive original pore waters because the sediments formed under different climate conditions. The highest value of the total dissolved solid in the formation water occurs in the ES4 member of Shahejie Formation due to the dissolution of halite and gypsum beds. In the overlying ES3 and ES2 members, low salinity water occurs, except for near syndepositional fault zones where a significant increase in salinity of formation water and a reduction in overpressure were observed. This fact indicates strong overpressured fluid flow where thermal anomalies have been observed, as evidenced from thermal gradient and fluid inclusion homogenization temperatures. The results indicate that the geochemistry of pore water may be used to help identify the main migration pathways for overpressured fluid flow with hydrocarbons.