塔里木盆地天然气勘探成果与前景预测

NATURAL GAS EXPLORATION ACHIEVEMENTS AND ITS PROSPECTS EVALUATION IN TALIMU BASIN

塔里木盆地截至１９９８年底共探明１０个大中型气田，发现１８个工业性含气构造，探明天然气地质储量２８２６×１０８ｍ３、凝析油储量６８６５×１０４ｔ。天然气富集在６个构造带上，有白垩系—第三系和石炭系两套主力砂岩产层，可划分出１０种气藏类型。气藏的分布受海、陆相两类含气系统的控制，并与大断裂带密切相关。天然气富集在４套区域盖层之下，具有晚期（晚第三纪）成藏的特点。陆相天然气藏分布在类前陆盆地逆冲构造带和前缘隆起张性构造带上；海相天然气藏分布在克拉通古隆起及其斜坡的断裂构造带，特别是断垒、断块潜山及其披覆背斜上。预计到２０００年，塔里木盆地的天然气探明储量将超过５０００×１０８ｍ３，到２０１０年可达１×１０１２ｍ３。

Ten large and middle gas fields had been explored in Talimu Basin by the end of 1998, while 18 commercial gas bearing structure had been found there. Till then, the gas in place had been explored as 2826×10 8m 3, condensate oil reserves as 6865×10 4t. Natural gas accumulated in six structural belts, where there are two main sets (Crataceous Tertiary and Carboniferous) of sandstone payzone, which can be divided into ten types of gas reservoirs. Natural gas distribution, a close relationship with large fault zone, is controlled by continental and marine facies gas bearing system. Natural gas accumulates under four series of regional caprocks, with the features of gas reservoir forming in later period. Continental gas reservoir distributes in foreland antithetic thrust belt and marginal lift tensile fault belt. Gas reservoir of marine facies distributes in craton palaeohigh and fault belts in its clino, especially in block faulted region, fault block buried hill and its drape fold anticline. It is predicted that the explored gas reserves in Talimu Basin will have exceeded 5000×10 8m 3 by 2000, and 10,000×10 8m 3 by 2010, and so Talimu gas will become a strategic successive base of gas resource in China.