海洋天然气水合物藏产气潜力地质评价指标研究

An exploitation of marine gas hydrate must be carried out based on a full assessment of gas production potential from the hydrate deposit. However, the field tests of hydrates are costly, while the experimental simulations on hydrate exploitation under high pressure conditions are still in small scales presently, and can not fully characterize the gas production potential in a reservoir scale. Thus it is the only way of hydrate production engineering to establish mining plans and calculate gas production potentials by numerical simulations. Because the gas productions, however, are impacted by complexity and differences of hydrate reservoirs, the production capacities must be evaluated by using different production methods for different hydrate reservoirs. Thus the research cost is high. Currently there are no geological evaluation indicators to simply assess gas production potential from hydrate deposits through hydrate occurrence and reservoir type. Therefore, the focus of this project is to establish geological parameters and evaluation indicators for predicting gas production potential from marine hydrate deposits. By combining with numerical simulation studies, a rapid evaluation and analysis platform will be created for evaluating gas production potential of marine gas hydrate reservoirs. Finally, the gas production potentials of hydrate deposits at Shenhu Area on northern continental slope of South China Sea and the typical regions of gas hydrates in the world will be evaluated by using the evaluation indicators. This project is of great significance for guiding exploration and exploitation of marine gas hydrates.

海洋天然气水合物开发必须是在对储层产气潜力充分评估的基础上进行。然而，水合物现场开采试验成本高昂，而高压条件下的水合物开采实验模拟，目前仍停留在微小尺度，不能充分表征储层规模水合物开采的产气潜力。通过数值模拟研究建立开采方案、计算水合物藏产气潜力是水合物试采工程的必经之路。但水合物储层特征的复杂性和差异性都会对产气潜力造成影响，需要对不同水合物藏采用不同开采方法进行产能模拟评价，研究成本较高，而目前尚没有水合物藏产气潜力的地质评价指标，无法根据水合物产出特征和储层类型进行简单高效的产气潜力评价预测。因此，本项目研究的重点是建立海洋天然气水合物藏产气潜力的地质评价参数和评价指标，并结合水合物开发的数值模拟研究，创建海洋天然气水合物藏产气潜力的快速评价分析平台，对南海北部陆坡神狐海域及国际典型区水合物藏的产气潜力进行评价预测。本项目研究对指导海洋天然气水合物勘探开发具有重要意义。

海洋天然气水合物开发必须是在对储层产气潜力充分评估的基础上进行。然而，水合物现场开采试验成本高昂，而高压条件下的水合物开采实验模拟，目前仍停留在微小尺度，不能充分表征储层规模水合物开采的产气潜力。通过数值模拟研究建立开采方案、计算水合物藏产气潜力是水合物试采工程的必经之路。但水合物储层特征的复杂性和差异性都会对产气潜力造成影响，需要对不同水合物藏采用不同开采方法进行产能模拟评价，研究成本较高，而目前尚没有水合物藏产气潜力的地质评价指标，无法根据水合物产出特征和储层类型进行简单高效的产气潜力评价预测。因此，本项目研究的重点是建立海洋天然气水合物藏产气潜力的地质评价参数和评价指标，并结合水合物开发的数值模拟研究，创建海洋天然气水合物藏产气潜力的快速评价分析平台，从天然气水合物储层地质参数分析入手，构建水合物储层开发模型，论证了水合物储层产气开发潜力，总结了不同岩性水合物储层的产能指标，对南海北部陆坡神狐海域及国际典型区水合物藏的产气潜力进行评价预测。本项目研究对指导海洋天然气水合物勘探开发具有重要意义。