松辽盆地扶新隆起带北部新庙西-新北地区扶余油层物源分析

Provenance Analysis on the Fuyu Reservoir in Xinmiaoxi-Xinbei Regions of the Northern Fuxin Uplift,Songliao Basin

物源方向研究是沉积相研究的重要内容,物源方向代表了地质历史时期古水流的方向,控制了砂体的展布范围和延伸趋势。因此物源方向的分析和研究对沉积相展布、储层评价及油气成藏等综合分析起着重要作用。本文结合盆地区域地质背景、重矿物组合、砂地比及古地貌特征,对松辽盆地新庙西新北地区扶余油层进行物源分析。结果表明,新庙西新北地区扶余油层存在两大物源体系,分别是西南方向以锆石为主要重矿物类型的西南保康物源体系和以石榴石为主、锆石次之的南部怀德物源体系,两大物源体系共同控制了新庙西新北地区泉四段沉积时期砂体的形成和分布,并且形成了"多物源混源沉积、各物源源间存异、各时期继承发育"的沉积格局。

Provenance direction research is an important part of the sedimentary facies research. The prove-nance direction is able to represent the direction of ancient water flow in the geological historical period. Further-more, it is able to control the distribution range and the extensive trend of the sand body as well. Consequently, theanalysis and research on the provenance direction plays an important role in the comprehensive analysis inw^lvingthe sedimentary facies distribution, reservoir evaluation, as well as oil and gas accumulations. Combining the anal-ysis on basin regional geological background, heavy mineral assemblages, sandstone ratio, and the characteristics ofpalaeogeomorphology, the provenance analysis on Fuyu reservoir is comprehensively conducted in Xinmiaoxi-xinbeiregions, Songliao Basin. The results show that Fuyu reservoir in Xinmiaoxi-Xinbei regions is greatly controlled bytwo provenances, that al the southwest Baokang provenance of mainly zircon and the south Huaide provenance ofmainly garnet and following zircon. The forming and distribution of sand bodies in Quan4 Formation of Xinmiaoxi-Xinbei area were jointly controlled by the two provenances all above. Consequently, hybrid sedimentation wereformed under the control of ＂ multi-provenance,differences existed between each other provenance,and the charac-teristics of every provenance were inherited between each phase＂ in Xinmiaoxi-Xinbei area.