川东北部香溪群的地震相和有利储层展布

SEISMIC FACIES AND DISTRIBUTION OF FAVORABLE RESERVOIR OF XIANGXI GROUP IN THE NORTH PART OF EAST SICHUAN

川东北部地区香溪群是以河流相为主的沉积。北东向主河流发育带是该河流沉积体系的骨架。下凹充填、丘形反射地震相分布带正是主河流带的地震响应。砂岩储层的物性和有利储层带的分布均受此河流沉积体系的影响。勘探中应充分考虑主河流发育带控制有利储层带展布这一认识。

Xinngxi Group in the north part of east Sichuan is mainly composed of fluviatile factes. Distributing and shifting zones of north-eastward major rivers formed the frame of the sedimentary system. Seismic facies showing distributing belts of cancave filling and mounded reflection are the response of the above-mentioned zones. Both phisical propcrty of sandstone reservoir and distribution of favorable reservoir are influenced by the sedimentary system. During the exploration it should be fully considered that distributing and shifting zones of major rivers always control the distribution of favorable reservoir zones.