松辽盆地深层天然气成藏富集规律和勘探方向

从构造演化、深层断陷和古隆起特征、储集条件、断裂发育、盖层条件等方面,总结松辽盆地深层天然气成藏富集规律。根据松辽盆地深层天然气区带地质评价参数取值标准,进行区带地质评价,并通过与刻度区类比,得出深层天然气资源量为11161.44×108m3,主要分布在徐家围子、庙台子、长岭、莺山、古龙等区带中。最后拟定松辽盆地深层天然气勘探方向为:徐家围子断陷的升平—兴城构造带、徐西斜坡和长岭断陷东部斜坡为战略展开区,徐家围子断陷宋站凸起、丰乐凸起和长岭断陷的中央凸起为战略突破区,莺山—庙台子和古龙等断陷为战略准备区。

Reservoir Formation and Exploration Orientation of Deep Natural Gas in Songliao Basin

The laws of natural gas reservoir formation of Songliao Basin are summed up from the perspectives of structural evolution,features of deep fault depressions and palaeohighs,reservoir conditions,fault development,and cap conditions.Geological evaluation of zones is conducted based on the criteria for selecting geological parameters of evaluating deep gas zones of the basin.On the basis of analogic methodology,the deep gas resources of the basin is evaluated as 1116.144 billion cubic meters,which is mainly distributed in the zones of Xujiaweizi,Miaotaizi,Changling,Yingshan,and Gulong.The target of exploration for the deep gas of the basin is ultimately determined as follows:Shengping-Xingcheng structural belt of Xujiaweizi fault depression,Xuxi slope,and the slope east of Changling fault depression are strategic areas for expanding exploration;Songzhan and Fengle uplifts of Xujiaweizi fault depression as well as the central uplift of Changling fault depression are strategic areas for making breakthroughs;Yingshan-Miaotaizi and Gulong fault depressions are strategic areas for preparing for exploration.