徐深地区徐西深大断裂特征与火山岩天然气成藏条件

Relationship between Xuxi Discordogenic Fault and Volcanic Reservoir Formation,Xushen Area

松辽盆地断裂活动与天然气的形成和分布有密切的关系。徐深地区天然气勘探取得重大进展,研究徐西深大断裂与火山岩天然气成藏的关系具有重要意义。从徐西断裂的几何学特征入手,研究了其活动特征和演化过程,结果表明深大断裂控制了断陷发育和沉降中心,从而控制了沙河子组烃源岩的分布及营城组火山岩储层的展布。沿徐西断裂发育的爆发相火山岩和巨厚烃源岩构成良好的生储盖组合,为天然气以较大规模成藏创造了有利条件。

The formation and distribution of oil and gas fields are greatly associated with discordogenic faults in the Songliao Basin. Great improvement has been made in the exploration of natural gas in the basin, and analyzing the relationship between the Xuxi discordogenic faults and reservoir formation is very important. In terms of the geometric feature of the Xuxi faults, this paper studied the dynamic development of the faults. It is shown that the discordogenic faults control the development of depression and its depositional center, thus controlling the distribution of Sahezi Formation source rocks and Yingcheng Formation volcanic reservoirs. The volcanic reservoirs and source rocks developed along the discordogenie faults form excellent source-reservoir-caprock combinations, favorable for the formation of large gas fields.