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通过对烃源岩、储层以及形成深盆气的地质作用进行分析,研究了准噶尔盆地腹部深盆气成藏的理论条件。准噶尔盆地侏罗系烃源岩成熟度较高,以生气为主;侏罗系砂岩岩屑含量高,煤层发育,颗粒偏细,导致砂岩储层在成岩过程中被快速压实,变得致密。在烃源岩大量生烃前,砂岩储层已经达到深盆气成藏的临界条件,为深盆气的成藏提供了条件。准噶尔盆地腹部超压系统内气测活跃,储层致密,超压顶界穿层,封闭层主要为砂岩,所有这些特征表明超压是由生烃作用引发的,是伴随着深盆气成藏过程而形成的。因此,超压可以作为深盆气系统的识别标志。
Through the analysis of the source rocks, reservoirs and the geological functions of forming deep basin gas, the theoretical conditions of deep basin gas accumulation in the abdomen of Junggar Basin are studied. The Jurassic source rocks in the Junggar Basin have a high degree of maturity and are mainly gas-generating. The Jurassic sandstone contains high content of cuttings and develops coal seams with fine particles. As a result, sandstone reservoirs are rapidly compacted and become compact during diagenesis . Prior to the massive hydrocarbon generation of source rocks, the sandstone reservoir has reached the critical condition of deep basin gas accumulation and provided the conditions for deep basin gas accumulation. In the overpressure system in the Junggar Basin, the gas in the overpressure system is active, the reservoir is dense, the overpressure top penetrates the layer, and the sealing layer is mainly sandstone. All these characteristics indicate that the overpressure is caused by hydrocarbon generation and is accompanied by the process of deep basin gas accumulation And formed. Therefore, overpressure can be used as a sign of deep basin gas system.