叠前地质统计学反演方法在长垣油田储层预测中的应用

Prestack geostatistical inversion method and its application on the reservoir prediction of Changyuan oil field

叠前地震反演方法相对于叠后反演方法得到的储层信息更多,能可靠地揭示地下储层的展布情况和孔、渗物性及含油气性,己经成为反演储层预测技术进一步发展的方向.文章以萨尔图油田北部区块为研究区,运用叠前地质统计学方法进行储层预测,根据其储层沉积特点和地质需求,对地质统计学反演的岩石物理模型、叠前子波等关键技术环节进行质控,最终得到研究区的砂体展布三维数据体;经平面抽井检验,叠前地质统计学反演方法得到的岩性体与地下客观地质体吻合,能够刻画出薄储层、砂泥岩互层及孤立砂体,但很难通过弹性参数对开发后期流体进行有效识别.该研究成果可为处于开发后期油田砂体精细刻画技术的研究提供借鉴.

The stratum distribution and porosity, permeability and oil-gas bearing properties can be revealed by prestack geostatistical inversion method and can get more reservoir informations than post-stack, it is the direction of further development on inversion reservoir prediction. Taking reservoir of north Saertu oilfield for example, 3D Geological Objects for sand body distribution of study area are obtained by the quality control on the key technologies of rock physical model, prestack wavelet; lithologic body from the prestack geostatistical inversion method matches the underground geological object, thin reservoir, sand and mud interbed and isolated sand body can be depicted, but it＇s difficult to efficiently identify the flow of late stage development through elastic characters. The fine description of late-stage oilfield sand body can be provided by the study.