摘要
孤岛、孤东油田馆陶组上段为河流相沉积 ,发育的微相主要有心滩、边滩、谷底滞留沉积、天然堤、决口扇、河漫湖泊、河漫滩等。岩性以砂岩、粉砂岩为主 ,成分成熟度中等偏低 ,小型交错层理较发育 ,平面上呈连片条带状 ,垂向上呈板状或不对称透镜状 ,1～ 4砂组为曲流河沉积 ,5～ 6砂组为辫状河沉积 ,储层物性好 ,孔隙度大 ,渗透率高 ,不同微相储层物性有所差别。沉积相带控制了水洗过程中物性的变化 ,使孔隙度和渗透率显著增加 ,控制了驱油效率的大小。由于心滩和边滩水驱油较充分 ,剩余油相对较少 ,河漫滩和天然堤驱油效率低 ,剩余油相对富集 ,所以微相的展布影响着剩余油的分布 ;正韵律油层上部大都动用较少 ,以弱见水为主。
The upper member of Guantao Formation consists mainly channel bar,point bar,arrested deposits on valley floor,natural levee,crevasse splay,alluvial lake and alluvial flat microfacies.The diposits are principally sandstone and siltrock with mid lower composition maturity and small cross bedding.1～4 sand set are meandering stream deposits,5～6 sand sets are braided channel deposits.The reservoirs of the study area have good physical property,big porosity and high permeability.Sedimentary facies zones controlled the variation of the physical property and improved the porosity and permeability.The channel bars and point bars contain less remaining oil,but alluvial flats and natural levee have relatively rich remaining oil.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2000年第3期256-258,共3页
Oil & Gas Geology
