【摘要】 在深水无井碳酸盐岩发育区开展储层预测,单纯以丘状地震反射作为识别生物礁的依据容易把不具有储层意义的生物丘误判为生物礁,同时也会忽略具有储层意义但不具有丘状反射特征的滩相沉积。对生物礁、生物丘及滩相沉积这三类地质体从地震反射特征和地震速度特征两方面进行了分析对比,它们相互之间既有联系又有区别:生物礁为高速反射,同时具有丘状反射外形;生物丘具有丘状反射外形但为低速反射;滩相沉积为高速反射,但无丘状反射外形。由此建立了新的深水区礁滩储层预测方法,并对琼东南盆地一深水研究区中新统梅山组碳酸盐岩储层进行了重新预测,把原来预测的相当大的一部分"生物礁"划分为生物丘,同时还新发现了面积几可与生物礁相当的滩相沉积。本文所用方法对深水区碳酸盐岩储层的预测更为精确。更多还原

【Abstract】 When reservoir prediction is carried out in a deep-water carbonate-distributing area without any exploration well,it is commonly not only easy to judge reservoir-free bioherms erroneously as real organic reefs only according to the mound seismic reflection configuration that is considered as the proof of reef existence but also easy to ignore the shoal flats without the feature of mound seismic reflection which are likely to be reservoirs.Contrasting seismic reflection with seismic velocity in feature,it is shown that some deference and correlation exist among reefs,bioherms and shoal flat bodies.A reef is characteristic of the mound reflection configuration with high velocity,and a bioherm is of same mound reflection configuration but with low velocity while a shoal flat(body) is of high velocity without the mound reflection configuration.Based on such features,a new method is built for predicting reef reservoirs and shoal flat reservoirs in deep-water areas.This method is applied to predict once more the middle Miocene Meishan carbonate reservoir in some deep-water area of Qiongdongnan Basin.The re-prediction gives a different result that a large part of reefs that were predicted before into "reefs" are reclassified into bioherms and meanwhile shoal flats with a such large area nearly as the distribution area of the reefs are unexpectedly discovered.It is proved that it is an accurate method for predicting carbonate reservoirs in deep-water area.更多还原