现代地质Issue(4)：765-776,12.
松辽北部三肇地区泉四段高分辨率层序学研究
Study of High Resolution Sequence Stratigraphy of Quan 4 th Member, Sanzhao Area in the Northern Songliao Basin
摘要
Abstract
Fuyu oil layer of Sanzhao Depression is one of the important oil-gas exploration areas in the north of Songliao Basin.Fuyu oil layer mainly is a set of river-shallow water delta deposition.Because single layer thick-ness of channel sand body is thin and its lateral change is quick,the study of sedimentary microfacies is neces-sary to conduct,which guide the exploration of stratigraphic-lithologic oil and gas reservoirs.Taking Zhao 35 block as an example,applying the high-resolution sequence stratigraphy principle,sequence boundary is identi-fied and sequence stratigraphic is divided.Taking short-term base level cycles as mapping units,sedimentary facies distribution maps within the framework of the sequence stratigraphic are drawn,the vertical evolution laws are analyzed and sedimentary microfacies model is established.The results show that Quan 4th Member is a long rising half cycle,which can be divided into 7 short-term base-level cycles (SSC1 -SSC7 ).The study area mainly develops delta plain and delta front subfacies,which can be further classified into (underwater)distribu-tary channel,(underwater)crevasse splay,natural levee and so on.SSC1 and SSC2 periods of 7 short-term base-level cycles are unsymmetry cycles dominated by ascending half cycles because of slowly rising base level. SSC3 and SSC4 periods are unsymmetry cycles dominated by ascending half cycles and symmetry cycles because of quickly rising base level.SSC5 to SSC7 periods are unsymmetry cycles dominated by ascending half cycles and base level rises to the highest.Sedimentary facies and its distribution are mainly controlled by the change of base level.The study area experiences the evolution of delta plain subfacies—plain,front subfacies transition—delta front subfacies—local shallow lake facies.In vertical direction,Quan 4th Member exhibits a lake transgres-sion process,whose sedimentary water changed from shallow to deep.关键词
高分辨率层序地层/沉积相演化/基准面旋回/泉四段/肇35 区块Key words
high-resolution sequence stratigraphy/sedimentary facies evolution/base level cycle/Quan 4th Member/Block Zhao 35分类
天文与地球科学引用本文复制引用
胡明毅,孙春燕,薛丹,张洪军..松辽北部三肇地区泉四段高分辨率层序学研究[J].现代地质,2015,(4):765-776,12.基金项目
大庆油田有限责任公司勘探开发研究院“三肇目标区扶余油层细分层沉积微相研究项目”（2013－JS－1003）。 （）
