【摘要】 靖边气田勘探开发实践表明,井间沟槽展布特征对开发钻井成功率具有重要影响。综合运用实钻井地层对比法、地震波形识别法及时窗滑移法对工区内古沟槽展布特征进行精细刻画,识别出10条一级沟槽、68条二级沟槽和376条三级沟槽。沟槽发育对储层物性既有建设性作用又有破坏性作用。建设性作用表现为:沟槽上方的斜坡区,由于沟槽的存在,往往水动力能量高,岩溶作用强烈,储层物性较好;破坏作用表现在:岩溶斜坡遭受切割而缺失主力气层,使得储层不能大面积连续含气。沟槽发育部位是古水流的指向区域,溶蚀作用相对较弱,储层致密,物性差。同时,沟槽对天然气富集控制作用明显,统计发现沟槽内部井平均无阻流量仅为0.9×104m3/d,沟槽外部井平均无阻流量则高达20.1×104m3/d。更多还原

【Abstract】 It has been verified by exploration and development practice that the distributing feature of erosion flutes has important influence on success rate of drilling. In order to determine the distributing feature of erosion flutes, strata antithesis,seismic waveform analysis and time window slip methods were used. There are 10 primary, 68 secondary and 376three-level valley troughs were recognized. The development of groove have both favorable and unfavorable influence on reservoir. On the one hand the reservoir besides erosion flutes has higher porosity and permeability for the strong karstification, on the other hand in erosion flutes tight reservoir often development due to the paleocurrent and faint dissolution.Meanwhile, the erosion flutes have control action on gas enrichment. The well’s average open flow capacity was 0.9×104m3/d when it in the erosion flutes, but 20.1×104m3/d outside erosion flutes.更多还原