北部湾盆地涠西南凹陷流一段强制湖退沉积体的特征及其油气地质意义

发布时间：2018-04-19 11:25

本文选题：强制湖退 + 沉积体　；参考：《石油与天然气地质》2016年04期

【摘要】：北部湾盆地涠西南凹陷始新统流沙港组一段发育一套斜交前积结构地层。利用地质、测井和地震等资料,通过单井相、连井对比和地震相特征等沉积相的综合研究,证实这套地层为强制湖退沉积体。该强制湖退沉积体在单井相上具有自下而上沉积水体明显变浅的特征,在连井对比中表现为多期三角洲纵向叠置横向有序迁移,而地震反射同相轴则表现出明显的斜交前积特征。进一步的研究表明,沉积基底局部构造抬升是流一段发生强制湖退的主控因素。这套强制湖退沉积体的发现不仅解决了涠西南凹陷涠三段和流一段区域地层划分与对比存在的分歧,同时在强制湖退沉积体系域内找到了浊积体、湖底扇和进积三角洲等多类型岩性圈闭,并发现了油气藏,拓展了凹陷找油新领域。
[Abstract]:A set of diagonal foreshadowed stratigraphy is developed in the first member of the Eocene Liushagang formation in Weisouthwest Sag of Beibu Bay Basin.Based on the geological, logging and seismic data, and through a comprehensive study of the sedimentary facies such as single well facies, multi-well correlation and seismic facies, it is proved that this set of strata is a forced lake regressive sedimentary body.The forced lacustrine retreating sedimentary body is characterized by obvious shallowness of sedimentary water from bottom to top in single well facies, and is characterized by horizontal and horizontal migration of deltaic longitudinal superposition in multiple periods of correlation.On the other hand, the cophase axis of seismic reflection shows obvious characteristics of oblique forward product.Further study shows that the local tectonic uplift of sedimentary basement is the main controlling factor for the forced lake retreat in the first member of the flow.The discovery of this set of forced lake retreating sedimentary bodies not only resolves the differences in stratigraphic division and correlation between Wei 3 member and Liuyi member in Wei Southwest Sag, but also finds turbidite in the forced lake retreating sedimentary system domain.Multiple lithologic traps such as sublacustrine fan and precession delta have been discovered and oil and gas reservoirs have been discovered, which has expanded the new field of oil prospecting in the sag.
【作者单位】：中海石油(中国)有限公司湛江分公司;
【基金】：国家“十二五”重点科技攻关项目(2011ZX05025-002)
【分类号】：P618.13

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