摘要
鄂尔多斯盆地镇泾地区中生界及以上地层主要经历了三叠系—侏罗系、侏罗系延安组—直罗组、侏罗系—白垩系和白垩系—第四系地层不整合面对应的4期地层抬升与剥蚀事件。综合利用压实曲线外推法及地层趋势对比法估算了三叠纪以来4期构造抬升事件导致的地层剥蚀厚度,并对其进行了对比与验证,采用盆地模拟方法恢复了研究区长8油层组顶面构造演化过程。结果表明,三叠纪末延长组地层剥蚀厚度为345~465 m、中侏罗世末延安组地层剥蚀厚度为150~220 m,侏罗纪末安定组地层剥蚀厚度为160~250 m,晚白垩世—新近纪末志丹群剥蚀厚度为980~1 280 m。构造沉降及抬升与剥蚀共同控制了研究区延长组地层的构造形态,自三叠纪以来,其表现为掀斜构造演化过程。
The Mesozoic and the overlain strata in Zhenjing area underwent four stages of formation uplift and denuda- tion events corresponding to the unconformity surfaces of Jurassic-Triassic, Jurassic Yanan Formation-Zhiluo Formation, Jurassic-Cretaceous and Cretaceous-Quatehaary. Compaction curve extrapolation method and formation tendency correlation method were used to estimate the denudation thickness resulted by the four stages of tectonic uplift events from Triassic, and the denudation thicknesses from different stages were compared. Basin numerical modeling method was applied to restore the structural evolution process of the top surface of Chang 8 oil reservoir set. The result shows that the strata denudation thickness of the end of Triassic Yanchang Formation is 345-465 m, the strata denudation thickness of the end of Middle Jurassic Yan＇an Formation changes from 150 m to 220 m. and the strata denudation thickness of the end of Jurassic Anding Formation is 160-250 m. However, the denudation thickness of the end of Late Cretaceous-Neogene Zhidan group is much more than that of the other three stages, and it varies from 980 m to 1 280 m. The structural form of Yanchang Formation in the study area was controlled by tectonic subsidence and uplift and denudation, with tilting structural evolution process from Triassic.
出处
《岩性油气藏》
CSCD
北大核心
2016年第2期72-79,113,共9页
Lithologic Reservoirs
基金
国家自然科学基金"典型致密砂岩天然气运移机理及成藏机制研究"(编号:41372151)
国家重大科技专项"深层油气
非常规天然气成藏规律与有利勘探区评价技术"(编号:2011ZX05008-004)联合资助
关键词
剥蚀厚度
压实曲线
地层趋势对比
埋藏演化
中生界
鄂尔多斯盆地
denudation thickness
compaction curve
formation tendency correlation
burial history
Mesozoic
Ordos Basin
作者简介
李超（1989-），男，中国石油大学（华东）在读硕士研究生，研究方向为石油与天然气运移。地址：（266580）山东省青岛市黄岛区长江两路66号中国石油大学（华东）地球科学与技术学院。E—mail：liehaoepu@126．com。
