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结合塔里木盆地天然气成因类型、烃源岩沉积环境、构造活动以及储层特征,对19个主要油气田(藏)41口井天然气中汞含量与分布特征进行了分析.库车坳陷汞含量为15.0～56964.3ng/m3,平均值为11793.7ng/m3,塔北隆起为16.1～28108.8ng/m3,平均值为6725.8ng/m3,北部坳陷为17.7～3339.5ng/m3,平均值为1678.6ng/m3,中央隆起为14.2～20220.6ng/m3,平均值为4311.1ng/m3,而塔西南坳陷为15428.5～296763.0ng/m3,平均值为156095.7ng/m3.塔里木盆地各构造单元的天然气中汞含量具有明显的区域性不同,塔西南构造活动强烈地带天然气中含量异常.自生自储型和火山活动期天然气藏有利于汞富集,而次生油气藏中汞含量明显偏低.陆相沉积环境形成的煤型气中汞含量高于海相沉积形成的油型气.因此,塔里木盆地天然气中汞含量主要与天然气成因类型、沉积环境、构造活动和火山活动有关,其中构造活动为主要控制因素,其次为沉积环境和火山活动.
Combined with the genetic type of natural gas, the sedimentary environment of source rocks, tectonic activities and reservoir characteristics in the Tarim Basin, the mercury content and distribution characteristics of natural gas in 19 major oil and gas fields (reservoirs) and 41 wells were analyzed. The mercury content in the Kuqa Depression was 15.0 ~ 56964.3ng / m3, the average is 11793.7ng / m3, the North uplift is 16.1 ~ 28108.8ng / m3, the average is 6725.8ng / m3, the northern depression is from 17.7 to 3339.5ng / m3 with the average value of 1678.6ng / m3, the central uplift is from 14.2 to 20220.6ng / m3, the average is 4311.1ng / m3, while the southwest depression is from 15428.5 to 296763.0ng / m3 with an average of 156095.7ng / m3. The mercury in the natural gas in each tectonic unit in the Tarim Basin The content of natural gas in the southwestern Tarim basin is very different from that in the southwestern Tarim basin, and the content of natural gas in the area with strong tectonic activity in the southwestern Tarim basin is abnormal.The natural gas pools of self-generative volcanic activity and volcanic activity are favorable for mercury enrichment, while the mercury content of secondary oil and gas reservoir is obviously lower. The mercury content of the coal-formed gas in the environment is higher than that of the oil-gas formed in the marine sediments. Therefore, the mercury content in the natural gas in the Tarim Basin is mainly related to the genetic type, sedimentary environment, tectonic activity and volcanic activity of the natural gas, of which tectonic activity is the main controlling factor Followed by sedimentary environment and volcanic activity.