基于地质灾害危险性的煤层气项目经济评价

煤层气开发项目可能遭受煤矿采空区地面塌陷的威胁，项目不同开发部署方案产生不同的地质灾害危险性评估结果，进而具有不同的经济效益。介绍了在地面塌陷区部署开发井的3种方案，对各方案的地质灾害危险性作了评估和综合分区，计算了各方案、各分区的管输量、现金流量和利润，其中危险性大区和中等区的结果不同，方案1抽采的煤层气多，开发设施受损也多，经济效益不好；方案2开发设施损失少，抽采的煤层气也少，经济效益较好；方案3开发设施受损数量减少，能抽采较多煤层气，经济效益好。采用投资回收期进行危险性分区的方案3优点多，已被开发单位接受。

Assessment of economic benefit for coalbed methane development project from geological hazard risk

Coalbed methane(CBM) development project may be threatened by coal mine goaf subsidence, different development project deployment schemes produce different geological hazard risk assessment, thereby have different economic benefits. This paper introduces three kinds of deployment schemes of development wells in the goaf subsidence area, conducts the geological hazard risk assessment and comprehensive zoning of each scheme, calculates the pipeline throughput, cash flow and profit of each scheme, each zone, there are differences in zones of high and medium risk. For scheme 1 more CBM is extracted, more development facilities are damaged too, the economic benefit is poor; For scheme 2, less development facilities are damaged, less CBM is extracted, the economic benefit is medium; For scheme 3, less development facilities are damaged, more CBM can be extracted, the economic benefit is good. There are more advantages in scheme 3 for risk zoning by using payback period of investment, scheme 3 has been accepted by developer.