海域天然气水合物试采目标优选定量评价方法初探

水合物试采的先决条件是目标是否符合地质与工程的可采条件.然而,由于前期无经验可循,尚无可定量化评价目标的方法.为克服水合物试采目标优选难题,从地质与工程两个角度建立了试采目标综合评价指标体系,在以储层孔隙度、水合物层厚度、水合物饱和度、储层固有渗透率、储层原位温度与压力作为6个地质因素,以储层水深、海底坡度、强度与上覆...

Quantitative Method for Selecting Marine Natural Gas Hydrate Production Test Targets

Prerequisites for hydrate production field test are whether the target meets the geological and engineering conditions for recoverability. However, since previous work is limited, there is no method to quantitatively evaluate the targets. To overcome the optimization problem of hydrate production test target wells, the comprehensive evaluation objective system is established from both geological and engineering perspectives. The six geological factors include porosity, hydrate thickness, hydrate saturation, intrinsic permeability, in-situ temperature and pressure; whilst the four engineering factors are water depth, underwater gradient, intensity and overlying layer thickness. The evaluation method (based on fuzzy comprehensive evaluation) is put forward to preliminary determine the comprehensive quantitative evaluation of production test target. Based on four typical hydrate coring sites (XX01, XX02, XX03 and XX04) in the Shenhu area of the northern South China Sea, the weights of the geological and engineering factors were estimated. The results show that the gas production potential at these four sites is unattractive. Nonetheless, site XX02 has the highest weight and was chosen as the target. The method of this study yielded good outcomes, and can provide support to optimize hydrate mining targets in intelligent quantification and promote hydrate industrialization in the future.