鄂北致密薄储层地震响应特征分析

鄂尔多斯盆地北部大牛地气田塔巴庙区块致密薄层发育。利用岩石物理等数据的物性参数,对不同储集条件下的薄层、薄互层进行地震正演分析。结果表明:在薄层特别是薄互层条件下,叠前波场响应特征十分复杂,有别于常规AVO类型的变化规律,且含气层和干层的响应特征有明显差异。根据叠前地震波场的响应特征和不同的变化规律可以细化薄层研究,进一步识别储集类型。

Analysis of seismic response characteristics of thin tight reservoirs in northern Ordos Basin

In the north of Ordos Basin，the thin tight reservoirs in Tabamiao area of Daniudi gas field dev- elped well． The authors construct seism forward modeling for thin bed and thin- interbedding under different kinds of reservoir conditions by rock physical parameters． The results show that the pre- stack seismic response is complicat- ed in thin bed，especially in thin- interbedding，which is different from the change regulation of normal AVO type． The seismic response characteristics of the dry beds are obviously different from the gas- bearing beds． Based on the pre- stack seismic response characteristics and different change regulation，the research of thin bed in detail can be carried out，which helps us to identify the type of reservoirs．