中文摘要：

浊积砂体是鄂尔多斯盆地三叠系延长组重要的储集体,目前发现的深水浊积岩集中在长6、长7油层组,在长9油层组中尚无发现浊流沉积的具体报道。通过岩心观察结合分析化验资料对盆地吴起周长地区延长组长9砂岩进行了岩性、粒度分析、测井等多方面的研究,得出了长9油层组上部地层为深水浊流沉积,证实了长9沉积期盆地中部存在北物源的浊积岩。通过浊积岩的岩性、结构构造、垂向组合等特征的详细描述,将该段沉积划分为三角洲前缘滑塌浊积扇,进一步识别出内扇、中扇、外扇3个亚相及主水道、分支水道、水道间等3个微相。并从油源条件、圈闭及储层等角度分析了滑塌浊积扇的致密油成藏条件,明确了该地区长9浊积岩的致密油成藏条件及意义。

英文摘要：

Turbidity was important reservoir of Yanchang formation in Ordos basin. Research of turbidite was focus on Chang 6 and Chang7 formation now. But there was no specific report about turbidite in Chang9 formation.Through analyzing the multiple perspectives of characteristics about cores,well logging data,grain size analysis and so on,the results showed that the upper strata of Chang9 reservoir group in Zhouchang area was turbidite deposit.Existence of turbidite with northern provenance was confirmed in Chang 9 formation of central basin for the first time. Through detailed discussion about rock combination,structure,sand body section and so on,slump turbidite fan was confirmed in Chang9 formation. Three subfacies of the inner fan,middle fan and three microfacies that contained main channel,branch channel,and inter- channel were identified. Tight oil geological significance of slump turbidite fan of Chang9 formation in Zhouchang area was ascertained from the oil source condition,trap,reservoir and so on.