松辽盆地深大断裂对天然气的控制作用

DISCORDOGENIC FAULTS AND THEIR CONTROLLING ACTION ON NATURAL GAS IN SHONGLIAO BASIN

近年来松辽盆地内天然气勘探取得重要突破。松辽盆地是断裂活动十分活跃的裂谷型盆地 ,盆内断裂与天然气的形成、分布有密切的关系。通过分析盆地内深大断裂展布、基本特征及其对盆地演化、构造发育的控制作用 ,总结出松辽盆地深大断裂发育具有早期生长继承发育后期休眠、早期生长长期继承发育后期褶皱回返、早期生长发育后期回返走滑、后期走滑、后期挤压背斜张断裂、浅层局部生长、后期挤压排生张断裂共七种活动模式 ,阐论了深大断裂的演化具有继承性 ,差异性 ,阶段性和改造性四重属性 ,然后分析了松辽盆地天然气藏分布规律及其与深大断裂的关系 ,得出松辽盆地天然气的形成与分布受深大断裂控制的结论。

An important breakthrough has been made in natural gas exploration in Shongliao Basin recently.Shongliao Basin is a rift basin with a strong fault activity and the faults in the basin are closely related to the origin and distribution of natural gas.Through analyzing the distribution and basic properties of the discordogenic faults and their controlling action on basin evolution and tectonic development,it is summarized that the discordogenic faults in Shongliao Basin are of seven active patterns,i.e.early stage growing—successive developing—later stage moving stop pattern,early stage growing—long timely successive developing—later stage folding uplift pattern,early stage growing and developing—later stage folding uplift and going slip pattern,later stage going slip pattern,later stage compressional anticline and extensional fault pattern,shallow local growing pattern and later stage compressional derivative extensional fault pattern,and have four properties,i.e.succession,diversity,discreteness and changeability.In light of summarizing the distribution laws of the gas reservoirs in Shongliao Basin and the relation between the discordogenic faults and the gas reservoir distribution,it is concluded that the origin and distribution of natural gas in Shongliao Basin are controlled by the discordogenic faults.