神狐海域水合物储层地质沉降数值模拟研究

Study on geological subsidence of Shenhu hydrate sediment by numerical simulation

摘要:

我国南海神狐海域赋存大量天然气水合物资源，能够有效解决我国未来的能源紧缺问题。但由于其储层地质特征复杂，储层物性条件差，开采难度大，开发成本高，商业化开采之前仍需要进行大量的基础研究工作。本研究通过数值模拟手段研究南海神狐海域水合物，根据实际地质参数建立数值模拟模型，采用单一垂直井开采手段，研究不同生产参数对开采的影响，并对地质沉降进行评估，结果表明，井底压力越低，储层打开程度越高，产气速度越快，但是地层沉降越明显，为避免地质灾害，应合理控制生产压力。

关键词:天然气水合物;数值模拟;地层;神狐海域

Abstract:

Shenhu area contain a large amount of natural gas hydrate resources， which can effectively solve the problem of future energy shortage. However， due to the complex geological characteristics of the reservoir and the poor physical properties of the reservoir. The difficulty of mining， and the high development cost， a lot of basic research work is still required before commercial mining. This study uses numerical simulation to study the hydrates in the Shenhu area of the South China Sea， establishes a numerical simulation model based on actual geological parameters， uses a single vertical well mining method to study the impact of different production parameters on mining， and evaluates the geological subsidence. The results show that the well The lower the bottom pressure， the higher the degree of reservoir opening and the faster the gas production rate， but the more obvious the formation subsidence. In order to avoid geological disasters， the production pressure should be controlled reasonably.

Key words:natural gas hydrates;numeral simulation;formation stability;Shenhu area