Numerical Simulation of Overpressure of Shallow Water Flow in Baiyun Sag of the Northern South China Sea
Received date: 2014-05-28
Revised date: 2014-08-25
Online published: 2014-09-10
Copyright
Overpressure in the deepwater basin has become a challenge, which constrains the development of oil and natural gas industry and is a global problem. Drilling risks associated with shallow water flow have received the most attention. High resolution seismic data in the northern South China Sea were acquired by the China Geology Survey in 2006. Detailed studies of this region reveal the presence of overpressured sands, which may cause the shallow water flow hazard. By combining the seismic data and logging, we created a mathematical model based on compaction theory and established relationship between the velocity and porosity, density and effective stress. The P-velocity was transformed to effective stress and overpressure ration. The simulating results show that the overpressure ratio is 0 at the seafloor, which indicates that there is no overpressure, or the fluid pressure is hydrostatic. The value of the overpressure ratio in the interest zone, which responds to the deepwater channel depositional system in Baiyun Sag, Pearl River Mouth Basin, is higher and increases with depth in deeper sediments. After 10 ka, the value becomes lower, the overpressure seems to be released, which corresponds to the formers’ achievement in pressure research.
Yunbao Sun , Tiehu Zhao , Ke Qin . Numerical Simulation of Overpressure of Shallow Water Flow in Baiyun Sag of the Northern South China Sea[J]. Advances in Earth Science, 2014 , 29(9) : 1055 -1064 . DOI: 10.11867/j.issn.1001-8166.2014.09.1055
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