页岩气藏可开采性评价及生产动态预测——以川西某页岩区块为例

Exploitability and Production Performance Evaluation for Shale Gas Reservoirs——Taking a Shale Gas Block in Western Sichuan as an Example

页岩气资源量丰富,为了使页岩气藏的开发效果最优化,需要对气藏的可开采性进行评价,同时对开发方案进行预测。根据页岩I区块的储层物性等资料,从有机地化指标、物性指标和力学指标评价了区块的储层品质。按照工区目前已钻单井数量与开发方式,以定产量的方式进行开采,利用数值模拟软件模拟预测区块30年的生产状况。虽然储层品质评价结果显示页岩I区块品质良好,适合进行大规模开采,但以工区目前生产井数和开采方式进行开采,30年累积采出程度仅为3.79%,不能有效开发研究区块,对方案进行优化设计,新增15口水平井,生产30年,最终采出程度为28.82%。

Shale gas resources are abundant in western Sichuan.To achieve the optimal exploitation effects,exploitability and production performance evaluation is needed.According to the physical property data of Block I,the reservoir quality was estimated from organic geochemistry,physical property and mechanics.On the basis of present 5wells and exploration way,using numerical simulation techniques the production performance of the next 30-year with constant gas rate is predicted.Results show that shale gas block I has favourable quality,but excellent production cannot obtain in the block if adopting present development way.The optimization design is to add 15 new horizontal wells and produce for 30-year with a constant rate.The ultimate recovery rate is 28.82%.