摘要
鄂尔多斯盆地西缘地区经历了较为复杂的构造演化,油气成藏特征与盆地内部相比存在较大差异。利用流体包裹体观察、统计和定量颗粒荧光技术(QGF和QGF-E)开展了西缘南段长8油藏详细分析。结果表明:油气包裹体荧光显示本地原油成熟度不高,包裹体丰度GOI及定量荧光数值均不大,研究区整体含油显示级别和含油饱和度均低于湖盆内部,其原因在于西缘生烃成藏条件不利;测试样品QGF Index值和QGF-E强度值两者变化趋势不一致,说明早期油气存在一定充注规模,后期油藏可能发生构造调整或者破坏造成了烃类逸散,使得西缘断裂发育区油水分布进一步复杂化。加强与盆内长8段成熟油区相关对比,可为拓宽类似该区西缘油藏勘探领域提供重要指导。
The West margin of Ordos basin is exposed to relative complicate tectonic evolution.Features of oil-gas reservoir here are quite different from those of the inner basin.Grains containing oil-gas fluid inclusions are carefully observed and QGF and QGF-E techniques are applied to detail analysis of reservoirs in Member Chang 8.The result shows that oil-gas maturity in the member is poor and GOI and value of QGE are relatively low that suggest more poor oil-gas-bearing feature of reservoir in the member than that of inner basin due to unfavorable hydrocarbon generation and accumulation condition of the West margin.Index value and QGF-E intensity value of QGE-testing samples Chang 8 in different tendency that is indication of oil charging in certain scale in the early stage.In the late stage tectonic activity may adjust the oil-gas migration or lead to the Oil-gas escape and dispersion and complicate distribution of oil-gas and water in areas with faults developed at the West margin.Correlation of data of reservoirs in the West margin with those in the inner basin should be strengthened to provide certain practical guidance for reducing risk and cost of oil-gas exploration in similar areas at the West margin.
作者
梁正中
许红涛
LIANG Zhengzhong;XU Hongtao(College of Chemistry Engineering, Yulin University, Yulin 71900, Shaanxi, China;School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China)
出处
《地质找矿论丛》
CAS
2022年第1期51-57,共7页
Contributions to Geology and Mineral Resources Research
基金
国家自然科学基金项目(编号:42062011)
陕西省科学技术厅攻关研究计划(编号:2020SF369)
榆林市科技局项目(编号:2019842)联合资助。
关键词
流体包裹体
定量颗粒荧光
油藏特征
延长组
鄂尔多斯盆地
Oil inclusion
quantitative grain fluorescence
reservoir formation feature
Yanchang formation
Ordos basin
