关键词: 断裂, 砂泥岩地层, 侧向封闭性, SGR法, 海拉尔盆地

Abstract: When evaluating the lateral closure performance of fractures in arenaceous shale formation,The SGR uses a constant derived from statistics as the lower limit,which leads to a significant deviation between the evaluation results and exploration practice.In view of the aforementioned issue,the minimum shale content of fault rock required for lateral closure of faults in arenaceous shale formation is determined by using fault dip angle,diagenetic time of fault rock compaction,shale content of target reservoir and diagenesistime of compaction.The results show that the minimum shale content of fault rock is a variable value based on the closure mechanism,which addresses the issue of insufficient constant value in SGR method and effectively improves the accuracy of lateral closure evaluation.This method has been applied to the evaluation of the lateral closure of the arenaceous shale reservoir in the southern section-2 of the F3 fault in the Huhenuoer tectonic zone of the western Beier Depression in the Hailar Basin,and the finds are as follows:at measuring points 5,7,8 and 12-15,the F3 fault closes laterally towards the inner side of the sandstone reservoir in the southern section-2,while at the remaining measuring points,it does not close laterally,which is consistent with the main distribution of oil and gas observed at measurement points 7,8,12 and 14.The research results are of great reference significance for the distribution characteristics of fault-type oil and gas reservoirs in arenaceous shale formation of oil and gas bearing basins,and indicate the direction of oil and gas exploration.

Key words: fracture, arenaceous shale formation, lateral closure, SGR method, Hailar Basin