桩52断块沙I油藏沉积微相与油水关系

RELATIONS BETWEEN SEDIMENTARY MICROFACIES AND OIL WATER DISTRIBUTION OF SHA I POOL IN ZHUANG 52 BLOCK

桩５２断块沙Ｉ油藏位于沾化凹陷五号桩近岸浊积扇中扇—外扇的沉积相带中。依据对油藏单井基准面旋回划分及在三维地震连井剖面上对标志层的对比标定结果发现，不同井中油层组顶、底界面由南向北依此被标定在时代较新的同相轴上，系统规则的跳穿相位现象预示油层组处于由南向北的前积反射体中。应用反射同相等时原理，确定出相邻井中油层组顶界等时关系，从而也就可划分对比出各井沉积旋回间小层的序列关系。经对各井间小层穿层数目在纵横连井剖面上的对比标定，将研究区近岸浊积体划分出由南向北、由老到新呈叠瓦状排列的２０个前积小层，同一小层在空间上的展布为东西方向延伸较远且连通较好，南北方向延伸相对较短。由于穿时作用，垂向上一口井一般多可钻遇４个小层。各小层南缘位于浊积体上超面附近，储层粒序多呈正韵律特点，小层北缘位于下超面附近，具反韵律特点，小层中部一般为块状均质沉积。在研究区由南向北各小层的储集物性及含油性有逐渐变好的趋势，储集体中的高孔、高渗、高含油饱和度带多集中在研究区的中部和北部。

Abstract Reservoir I in the lower part of the third member of the Shahejie Formation is attributed to midfan external fan facies zone of nearshore turbidite fan in Zhang 52 block fault,Zhanhua Sag.According to the division of single well base level cycle and the correlation of key horizon on 3 D seismic progile,oil reservoirs exist in the progradation retrogradation bodies extending from south to north based on isochronous principle,the isochrosnous relation of the top and base boundaries of the reservoirs of adjacent wells were made out,so the seguences of sedimentary cycles of each well.Then the nearshore turbidite bodies in the study area were divided into 20 imbricate prograding bodies.In vertical,single well may drill four subbeds.The south edges of the turbidites are near the onlap boundaries of the turbidites and the reservoir grain grade appears positive rhythmic property while that of the north edges shows negative rhythmic property,the central part of the subbeds are massive homogeneous deposits.The physical properties and petroleum bearing property of the subbeds get better from south to north and the best ones are in the central and north parts of the study area.