摘要
鄂南中生界上三叠统延长组致密油已成为现今石油地质研究的焦点之一,致密油成藏模式及控制因素的研究对鄂尔多斯盆地三叠系下组合的深入勘探具有重要意义。通过对鄂尔多斯盆地西南缘镇泾油田构造特征、烃源岩、储层特征、生储盖组合以及运移动力等综合地质特征的分析,总结三叠系延长组长9致密油成藏模式及控制因素。结果表明,镇泾油田长9油源来源于上覆长7的张家滩油页岩;长9油层组储层物性较差,孔隙度平均为13.2%,渗透率平均为1.7×10^(-3)μm^(2),运移动力以源储剩余压力差为主,石油通过优势通道垂直向下运聚,在源储剩余压差的驱动和断裂的输导作用下,选择性的长距离运聚至长9优质高渗储层中成藏。镇泾油田三叠系延长组长9致密油成藏模式可以概括为“烃源岩控制油气分布,异常高压和断裂控制油气运移,多因素匹配择优成藏”。
The tight oil reservoir of Mesozoic Triassic Yanchang fromation in the south of Ordos Basin has become one of the focuses of current petroleum geological research,tight oil accumulation model and controlling factors have great significance to in-depth exploration in the Triassic of Ordos basin.Based on the analysis of characteristics of hydrocarbon source rocks,reservoir characteristics,reservoir and cap combination and migration dynamic comprehensive geological conditions in Zhenjing region in the southwest of Ordos Basin,forming patterns and main controlling factors of tight oil reservoir in the Chang9 were summed up.The results showed that,Chang 9 reservoir’s source in Zhenjing region was derived from the Chang 7.Chang 9 section had low porosity(13.2%in average)and low permeability(1.77×10^(-3)μm^(2) in average),migration dynamics was given priority to the presence of overpressure,oil accumulated in the reservoir with the vertical migration.oil was selectively accumulated in Chang 9 high permeability reservoir by the residual pressure differential and conducting of the fracture with long distance migration.The accumulation patterns of Zhenjing Triassic Chang 9 tight oil reservoir can be summarized as“source rocks control oil and gas distribution,abnormal high pressure and faults control oil and gas migration,and multiple factors are matched to select the best reservoirs”.
作者
孔为
逄建东
康弘男
张昊
韩冬
KONG Wei;PANG Jian-dong;KANG Hong-nan;ZHANG Hao;HAN Dong(CNOOC EnerTech Drilling&Production Co.,Tianjin 300457,China)
出处
《辽宁化工》
CAS
2022年第2期269-271,共3页
Liaoning Chemical Industry
基金
中国石化华北油气分公司(项目编号:34550000-13-TZ0499-0004)
国家科技重大专项(项目编号:2011ZX05004-002)联合资助。
关键词
成藏模式
控制因素
长9油层组
致密油
Accumulation patterns
Controlling factors
Chang 9 section
Tight oil
