鄂北致密薄储层地震响应特征分析
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摘要
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。
In the north of Ordos Basin,the thin tight reservoirs in Tabamiao area of Daniudi gas field develped 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 complicated 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.
引文
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