作者简介:孙运宝(1983-),男,山东烟台人,博士研究生,主要从事水合物形成机理数值模拟研究. E-mail:yunbaos@sina.com
收稿日期: 2014-05-28
修回日期: 2014-08-25
网络出版日期: 2014-09-10
基金资助
中国博士后基金项目“南海神狐海域水合物储层地球物理响应特征数值模拟”(编号:2012M521296);中国地质调查局国家专项工作项目“天然气水合物勘查技术研发”(编号:GZH201100308)资助
版权
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
深水超压是制约深水油气开发的重要问题,其中浅水流是对深水钻井最具破坏力的一种地质灾害。结合南海北部陆坡最新采集的高分辨率二维和三维地震资料,采用基于压实模型的流体压力模拟方法,通过井震联合分析,建立地震属性与岩石物性的关系,对研究区现今压力场状态进行模拟,获取了有效应力和超压系数等参数,探讨了沉积压实作用下的浅水流演化过程。通过模拟发现浅水流发育区的水动力特征与研究区的沉积模式密切相关,低渗透率地层的沉积物加载导致现今压力场具有明显的低有效应力异常和高超压系数,而如果仅考虑由沉积压实作用,现有的沉积速率尚不足以维持持续地超压来造成高风险的浅水流灾害,但其泄压过程也是个漫长的阶段。
孙运宝 , 赵铁虎 , 秦柯 . 南海北部白云凹陷沉积压实作用对浅水流超压演化影响数值模拟[J]. 地球科学进展, 2014 , 29(9) : 1055 -1064 . DOI: 10.11867/j.issn.1001-8166.2014.09.1055
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.
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