综合运用岩心、物性数据、钻采资料、试油和测井解释等资料,运用分布函数曲线法、含油产状法、孔隙度—渗透率交会法及试油法,共同确定查干凹陷苏一段碎屑岩有效储层物性下限值,并根据试油结果进行验证.在此基础上分析了岩性、成岩作用和沉积相对有效储层的影响.结果表明,辫状河三角洲前缘水下分流河道砂体物性最好,其次为扇三角洲前缘水下分流河道砂体,滑塌浊积扇砂体物性最差; 从不同岩性的孔隙度分布区间来看,有效储层主要发育在砂砾岩及细砂岩中,含砾砂岩次之,砾状砂岩及粉砂岩有效储层发育最差.压实作用减少的孔隙度平均为16.96%,胶结作用减少的孔隙度平均为8.5%,对有效储层物性变差影响较大; 酸性溶蚀作用增加的孔隙度平均为5.28%,可改善储层物性.总体上,储层物性主要受到沉积相和成岩作用两大因素控制,沉积相对有效储层的控制作用强于成岩作用.%Based on the drilling core, physical property, drilling, well testing and well logging data, the lower property limit of the first member of Suhongtu Formation in Chagan Sag was determined by applying distribution function curve meth-od, occurrence method of oiliness, convergence method of porosity and permeability and production test method which were certificated by actual data measurement. On this basis, we analyzed the effects of lithology, sedimentary facies, and dia-genetic on the formation of effective reservoir rocks. Results showed that:the physical property of braid river-deltaic front subaqueous distributary channel was the best, secondly was the fan-deltaic front subaqueous distributary channel, and the physical property of fluxoturbidite sand body was the worst. From different proportion area property occupied of different li-thology of view, effective reservoir mainly developed in fine conglomerate and sandstone, pebbly sandstone was the second, and brecciated sandstones and siltstones were the worst. In diagenesis, compaction was 16. 96%. The averaging decreasing property because of cementation was 8. 5% and its influence to effective reservoir was obvious. The averaging decreasing property because of acidic corrosion was 5. 28%, having significant results on reconstructing reservoir as preponderance val-id reservoir. On the whole, reservoir properties were controlled mainly by raw material basis and diagenesis, and the con-trol on valid reservoir of sedimentary facies was stronger than lithology.
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