中国深层天然气勘探前景

THE EXPLORATION PROSPECT OF DEEP GAS IN CHINA

我国的深层天然气一般指的是聚集在埋深超过 350 0m地层中的天然气。从深层气的生成、储集、圈闭、保存条件等主要方面分析了深层天然气的成藏条件。中国深层天然气资源量为 2 1 .66× 1 0 1 2 m ,占全国天然气总资源量的 57%。其中陆上为 1 7.1 1× 1 0 1 2 m ,海域 4.55× 1 0 1 2 m。陆上深层气资源主要集中在中西部地区 ,其中中部地区 6.31× 1 0 1 2 m ,西部地区 8.1 4× 1 0 1 2 m。中国深层天然气勘探目标广阔 ,前景乐观 ,主要分布在松辽盆地、渤海湾盆地、鄂尔多斯盆地、四川盆地、塔里木盆地、吐哈盆地、柴达木盆地、南方地区及近海海域等 1 0个地区的深部地层中 ,文中指明了勘探目标。深层天然气勘探应采用新技术和综合勘探方法才能提高勘探成功率并降低勘探成本。

Deep gas in China usually refers to the natural gas which has been accumulated and gathered in the formation with buried depth of over 3 500 meters.The formation factors of reservoirs are studied and analyzed from some major aspects like generating,accumulating and gathering,trapping and conservation requirements of deep gas.In China,the deep gas resource extent,57 per cent in the total,achieves in 21.66 trillion cubic meters (21.66×10 12 m 3),among which 17.11 trillion cubic meters was found on the continent,4.55 trillion cubic meters in the sea.The continent deep gas resource was discovered mainly in the middle and west areas (6.31×10 12 m 3 in the middle;8.14×10 12 m 3 in the west).There is a wide area for exploring targets of deep gas in China,so the exploration has a bright future.The exploring targets,described in details in this paper,distribute widely in the deep formations of ten main districts such as Songliao Basin,Bohaiwan Basin,Erduosi Basin,Sichuan Basin,Talimu Basin,Tuha Basin,Caidamu Basin,South area and some adjacent sea area,and so on.Only if new technique and multiple exploring methods are to be applied in exploring deep gas,will the exploration success ratio be improved so as to reduce the exploration cost.