针对涠洲A油田储层平面非均质性强、存在砂体叠置,以及单纯的波阻抗反演不能十分有效地识别砂泥岩和叠置砂体,提出了将纵波阻抗与横波阻抗通过一定的数学变换获得岩性阻抗的方法,证实了该岩性阻抗反演结果与实钻井吻合程度高,有效区分了砂岩和泥岩,并成功地预测了涠洲A油田砂体叠置的关系.

In view of the plane heterogeneity of reservoirs and the superimposition of sand body in Weizhou-A Oilfield, Beibuwan Basin, the well data analysis shows that the simple impedance inversion can' t identify sand-mudstone and superimposed sandbody effectively. The lithology impedance was presented in this study by using mathematical transformation method of the P-wave impedance and S-wave impedance. It is proved that the results of lithology impedance are in high coincidence with drilling. The sandstone and mudstone are identified effectively, and the superimposed relationship of sandbody was predicted successfully by using lithology impedance.