Water Loads and Its Effect on Basin Subsidence

LIU Xue-feng; ZHONG Guang-fa; MENG Ling-kui; YU Guo-rong; HUANG Chang-qing

Basin subsidence can be induced by many factors, such as tectonic activity, sedimentary loading, and water loading, and so on. This paper puts forward a concept of water loads subsidence, deduces a calculation formula of water loads subsidence, quantitatively analyzes the contribution of water loads to basin subsidence. Furthermore, fully considering the effects of sediment loads,water loads,sea-level changes, and paleao-water depth on basin subsidence, this paper gives a revision to the formula used to calculate the tectonic subsidence by Steckler and Watts. The quantitative analysis of the COST B-2 well located in Atlantic-type continental margin of New York, U.S.A indicated that each 1km tectonic subsidence can simultaneously results in 0.435 km water loads subsidence, the "true" tectonic subsidence that removed water loads effect on basin subsidence is about 30.3% lower than the result calculated using Steckler and Watts formula. So, we can conclude that water loads are one of the important factors, which result in the intensive subsidence of Atlantic-type continental margin.

1. Department of Geosciences, Jianghan Petroleum Institute, Jingzhou Hubei 434023;

2. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079;

3. School of Ocean and Geoscience, Tongji University, Shanghai 200092;

4. GPS Centre, Wuhan University, Wuhan 430079

Received Date: 2003-06-23

Rev Recd Date: 2003-11-18

Publish Date: 2004-09-10

Key words:

Abstract: Basin subsidence can be induced by many factors, such as tectonic activity, sedimentary loading, and water loading, and so on. This paper puts forward a concept of water loads subsidence, deduces a calculation formula of water loads subsidence, quantitatively analyzes the contribution of water loads to basin subsidence. Furthermore, fully considering the effects of sediment loads,water loads,sea-level changes, and paleao-water depth on basin subsidence, this paper gives a revision to the formula used to calculate the tectonic subsidence by Steckler and Watts. The quantitative analysis of the COST B-2 well located in Atlantic-type continental margin of New York, U.S.A indicated that each 1km tectonic subsidence can simultaneously results in 0.435 km water loads subsidence, the "true" tectonic subsidence that removed water loads effect on basin subsidence is about 30.3% lower than the result calculated using Steckler and Watts formula. So, we can conclude that water loads are one of the important factors, which result in the intensive subsidence of Atlantic-type continental margin.

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Reference (17)

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Water Loads and Its Effect on Basin Subsidence

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