中国石油大学学报（自然科学版）2018，Vol.42Issue(4)：11-22,12.DOI:10.3969/j.issn.1673-5005.2018.04.002
东营凹陷古近系浅层稠油油藏封堵机制
Sealing mechanism of heavy oil reservoir in shallow Palaeogene Formation, Dongying Sag
摘要
Abstract
The sealing mechanism of the heavy oil reservoir in shallow palaeogene formation of the Dongying sag has not been ad-dressed clearly, which has become a key factor impeding further oil and petroleum exploration in the area.Taking the heavy oil reservoir of the Es3s formation in the Yongbei nose-like structure as an example, its sealing mechanism was systematically studied combining 3D-seismic interpretation, well logging analysis, cores and thin sections observation,physical properties analysis and oil testing, as well as burial history and fluorescence of fluid inclusion analyses.The results suggest that the heavy oil reservoir is mainly distributed under the unconformity surface, and the weathered clay rock could act as a vertical sealing layer.Mainly com-posed of debris flow sediments, the fan delta plain could seal the heavy oil developed in the fan delta front on account of the physi-cal properties difference between overlying subfacies.With destruction of meteoric water leading to thickening of the earlier oil, a sealing belt composed of heavy oil or asphalt, whose viscosity exceeds 10000 mPa· s, could seal oil downdip.The process to form heavy oil reservoir is divided into four periods , including deposition of original formation, charging of early oil,thickening of earli-er oil,and charging of later oil.The accumulation model of the heavy oil reservoir is built accordingly .The earlier low-mature oil is thickened to form heavy oil or asphalt, then, the later mature oil or thin oil charges to mix with the foregoing thickened oil par -tially,leading to the distribution of asphalt belt , mixing belt,and thin oil belt from fan delta plain to front , respectively.关键词
封堵机制/稠油/不整合/沙三上亚段/永北鼻状构造/东营凹陷Key words
sealing mechanism/heavy oil/unconformity/Es3s formation/Yongbei nose-like structure/Dongying Sag分类
能源科技引用本文复制引用
操应长,王铸坤,王艳忠,李宇志,赵博..东营凹陷古近系浅层稠油油藏封堵机制[J].中国石油大学学报（自然科学版）,2018,42(4):11-22,12.基金项目
国家科技重大专项(2016ZX05006-007,2016ZX05006-003) （2016ZX05006-007,2016ZX05006-003）
中央高校基本科研业务费专项(15CX08001A) （15CX08001A）
