渤海湾盆地沙南凹陷BZ油田湖相生屑云岩储层投产后,发现实际生产特征与初始地质认识存在较大差异.利用油田丰富的生产动态资料(压力、产量及PVT实验等数据),采用广义物质平衡法并结合古地貌研究和古生态环境恢复,反向预测了研究区的生屑云岩发育规律及规模.结果表明:纵向上,随着湖盆水体持续扩张,生屑滩沿古隆起缓坡带呈退积-超覆模式;平面上,生屑滩主要发育于水进过程中的古地貌缓坡带,储层平面展布受到古地貌凸起带、构造脊的分割而呈片状且不连通分布模式.根据新模式部署了2口调整井,实钻生屑云岩1.0、7.6m,新增探明石油储量近400×104t.本文研究成果可为类似地质特征的湖相生屑云岩储层精细刻画提供新思路.%After the lacustrine bioclastic dolostone reservoir of BZ oilfield in Shanan sag was put into production,obvious contradiction between the actual production performance and initial geological understanding was observed.Based on abundant oilfield production data (pressure,output and PVT experiment data,etc.),generalized material balance method combined with the study on ancient landform and the regeneration of paleo-ecological environment were used to make backward prediction on the development rules and scale of bioclastic dolostone in the study area.Research results prove that longitudinally,along with the continuous expansion of the lake basin water bodies,the bioclastic beach presents a retrograde-overlap mode on the ancient uplift slope.On the plane,the bioclastic beach mainly developed on the ancient gentle slope and undergone transgressive episode.Because of the division of the uplift and structure ridge,the planar distribution of the reservoir is sheet-like and disconnected.According to the new pattern,two adjustment wells were deployed and actually drilled 1.0 m and 7.6 m into bioclastic dolostone respectively,and the newly increased proven oil reserves were nearly 4 million tons.This paper provides a new idea for the fine characterization of lacustrine bioclastic dolostone reservoirs with similar geological characteristics.
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