我国致密砂岩气资源潜力、分布与未来发展地位

Resource evaluation,position and distribution of tight sandstone gas in China

系统分析了我国鄂尔多斯、四川和塔里木等主要盆地致密砂岩气成藏条件和主控因素,提出斜坡岩性型和深层构造型是两种最重要的致密砂岩气藏。采用多因素叠合法预测有利含气范围,并通过对已知重点致密砂岩气田的解剖研究,刻度出储量丰度、含气面积系数等关键参数,采用类比法来计算主要盆地的致密砂岩气资源量。研究表明,我国致密砂岩气技术可采资源量为9.2万亿～13.4万亿m3,主要分布于含煤系地层的盆地中;致密砂岩气资源开发利用现实性最好,在国家政策扶持和工程技术进步的推动下,再经过10～20年的发展,有望成为我国天然气开发利用的主导资源之一。

Based on the reservoir forming condition research of tight sandstone gas in Ordos Basin, Sichuan Basin and Tarim Basin, the authors give two types of tight sandstone gas reservoirs, sloped lithologic type and structural type which are the main of tight sandstone gas reservoir. The favorable gas region is predicted with multi-factor overlay method. And based on the existed tight sandstone gas reservoir analysis, the authors get the main parameters such as reservoir abundance, gas-bearing area coefficient which are necessary for gas resource calculation of the large basin through analogism method. According to the result of this resource evaluation, the tight sandstone gas geological recoverable resource in China is 9.2 ×10^12 - 13.4 ×10^12 m3 which is widely distributed over coal measure basins. The tight sandstone gas is the most realistic source in present. Due to the support of government policies and the motivation of technological progress, it might become one of the pillar sources in natural gas development in 10 to 20 years.