页岩气可采性参数研究

Research on parameters of shale gas recoverability

基于我国页岩气地质条件和近年来页岩气勘探实践,对比国外页岩气开发盆地的地质条件,研究了埋深及厚度、TOC含量、矿物组成、物性、储渗空间、孔隙结构、含气量、岩石力学、资源丰度及资源量、地面条件、断层、压力系数、地应力等影响页岩气可采性的主要参数。根据国外页岩气勘探开发成功经验,结合四川盆地页岩气勘探开发实际情况,提出了关键参数门限值,建议对不满足这些门限值的页岩地层进行开采时应慎重,指出单一因素对某一地区的页岩气勘探开发所起的作用也许是至关重要的,但对大多数地区来说,页岩气的可采性取决于各种地质因素的有效配置,参数之间存在一定的互补性。

Based on the geological conditions and exploration practices of shale- gas in recent years in China,compared with foreign shale- gas geological conditions of developed basins,it was studied on the main parameters affecting shale- gas recoverability,including buried depth,thickness,TOC content,mineral composition,pore structure,physical property,reservoir space,gas content,rock mechanics,resources abundance and resources,ground conditions,fault,pressure factor,geostress,and so on. According to the successful experiences of shale- gas exploration and development,combining with the practical situation of shale- gas in Sichuan Basin,we put forward the threshold values of key parameters and suggested that it should be careful to exploit shale which can not meet these threshold values. It is pointed out that for one certain region,single factor may play a vital role in exploration and development of shale- gas,but for most areas,the shale- gas recoverability depends on the efficient allocation of various geological factors and there is certain mutual supplement between parameters.