层序地层学在埕东-飞雁滩油田馆陶组上段岩性油气藏勘探中的应用

Application of sequence stratigraphy in lithological reservoir exploration of the Upper Guantao Formation, Chendong-Feiyantan Oilfield

胜利油田埕东-飞雁滩地区新近系馆陶组上段划分为1个三级层序、3个体系域、10个准层序组、23个准层序,层序界面、最大湖泛面、初次湖泛面和准层序界面控制了岩性油气藏分布。研究各级层序地层单元中的岩性油气藏分布特征,认为:岩性油气藏的分布与各体系域的特征相关,低位域和湖侵域砂体发育(高位域砂体不发育),故岩性油气藏发育,但低位域砂体缺乏良好封盖层,只发育小型油藏,而湖侵域砂体的封盖条件好,因此是岩性油藏主要赋存的层位;岩性油气藏的分布还受准层序的控制,如湖侵域中主要发育向上粒度变粗的准层序,而储集砂体分市于准层序的顶部,所以岩性油气藏主要发育于准层序顶部。

Distribution of reservoir in the Upper Guantao Formation of Neogene in Chengdong-Feiyantan Oilfield, Jiyang Depression is comprehensively studied by sequence stratigraphy and the high-resolution sequence stratigraphic framework is established. The Upper Guantao Formation can be divided into one 3-order sequence with 3 system tracts, 10 parasequence sets and 23 parasequences. Effects of the sequence boundary, max flooding surface, first flooding surface and parasequence boundary on oil distribution are demonstrated. Though sand-bodies occur mainly in LST and TST, the hydrocarbon is mainly distributed in TST.