BASIC GEOLOGICAL AND GEOCHEMICAL BACKGROUND OF UNCONVENTIONAL GAS RESOURCES IN CHINA
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摘要: 致密砂岩气、页岩气、煤层气、天然气水合物是非常规天然气资源的主要类型。我国非常规天然气资源丰富,其中致密砂岩气储量、产量已占全国天然气的三分之一,主要分布在四川盆地与鄂尔多斯盆地,勘探前景十分广阔;煤层气资源量及探明储量较大,但目前勘探开发程度相对较低;页岩气资源量大但目前尚处在勘探探索阶段。近年来,在全球"页岩气革命"热潮的影响下,我国广泛开展了页岩气研究与勘探侦察,证实具备了页岩气形成的物质基础——广泛发育海相、海陆过渡、陆相三套页岩,且最有利突破区是发育早古生代海相页岩的四川盆地;我国天然气水合物资源丰富,目前已在南海及祁连山永久冻土带钻获实物样品,初步预测其具有巨大资源潜力和勘探前景。拟根据目前我国非常规天然气勘探开发现状及研究程度,重点对非常规天然气资源的基本地质地球化学特征及其主要特点进行深入分析探讨,以期对加快非常规天然气勘探开发步伐,促进我国油气能源的大幅增长及降低对外依存度有所裨益。Abstract: China is rich in unconventional gas resources of tight sandstone gas, shale gas, coalbed methane and gas hydrates. Tight sandstone gas predominates, of which the reserve and production account for one-third of the whole country, mainly in Sichuan and Ordos Basins. The proven reserves of coalbed methane resources are large, but the level of current exploration and development are relatively low. Shale gas resource has great potential in China. Under the influence of the global "shale gas revolution", China has rendered extensive exploration in the field recently, but it remains in the stage of exploration. It is confirmed that there are three kinds of shale in China, i.e. the marine shale, terrestrial shale and shale in marine and non-marine transitional sequences. Sichuan is the most favorable area. Gas hydrate resource is mainly in the South China Sea and the permafrost area in the Qilian Mountain. Preliminary estimation shows that there is enormous resource potential for exploration. Based on the current exploration situation and data available, we made an in-depth investigation of the basic geological and geochemical background of unconventional gas resources in China in this paper for the purpose to accelerate the pace of exploration and development of unconventional gases.
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