渤海湾盆地歧口凹陷古近系沉积体系重建与储集层评价

发布时间：2018-04-04 12:02

本文选题：歧口凹陷　切入点：沉积体系　出处：《成都理工大学学报(自然科学版)》2017年05期

【摘要】：应用陆相层序地层分析与传统沉积学等方法,探讨渤海湾盆地歧口凹陷古近系沉积体系的空间展布规律与有利储集层发育特征,为高勘探程度区油气二次勘探部署提供支撑。研究结果表明歧口凹陷古近系斜坡作为古地貌单元的主体,为大面积岩性油气藏的形成奠定了地质基础;除四大盆外隆起物源外,孔店、港西等盆内凸起也是碎屑沉积体系的重要物质来源,斜坡区既富泥也富砂;古近系相序完整,环湖规模性发育了辫状河三角洲、扇三角洲、远岸水下扇、湖泊碳酸盐岩等相类型;中深层储层具有原生、次生孔隙与微裂缝共存的特点,在异常高压、早期油气充注和次生溶解等作用下,中深层也发育优质储层,斜坡区的勘探下限可达5km;多类储集体与歧北挠曲斜坡、板桥斜坡、埕北断坡等匹配形成地层超覆、不整合遮挡、上倾尖灭等地层-岩性圈闭带。勘探结果发现了歧北斜坡、埕北断坡亿吨级储量区,板桥斜坡形成了千万吨级效益储量区。斜坡区作为断陷湖盆负向构造单元,是地层-岩性油气藏有利的勘探领域。
[Abstract]:By means of continental sequence stratigraphy analysis and traditional sedimentology, the spatial distribution of Paleogene sedimentary system in Qikou depression, Bohai Bay Basin, and the characteristics of favorable reservoir development are discussed, which provide support for the secondary exploration of oil and gas in high exploration area.The results show that the Paleogene slope in Qikou sag, as the main body of paleogeomorphology unit, lays a geological foundation for the formation of large area lithologic reservoirs, except for the provenance of uplift in four large basins, Kongdian,The uplift in the basin is also an important material source of the detrital sedimentary system, the slope area is rich in both mud and sand, and the Paleogene facies sequence is complete, and the braided river deltas, fan deltas and far shore underwater fans are developed on a large scale around the lake.Lacustrine carbonate rocks and other facies types, the middle and deep reservoirs have the characteristics of primary, secondary pores and microfractures. Under the action of abnormal high pressure, early oil and gas filling and secondary dissolution, the middle and deep layers also develop high quality reservoirs.The lower limit of exploration in the slope area can be up to 5 km, and many types of reservoirs are matched with the flexure slope of Qibei, Banqiao slope and Chengbei fault slope to form stratigraphic-lithologic trap zones such as strata overlying, unconformable occlusion, updip tip extinction, and so on.The exploration results show that Qibei slope, Chengbei fault slope, and Banqiao slope have a reserve area of 100 million tons.As a negative structural unit of faulted lacustrine basin, slope area is a favorable exploration area for stratigraphic and lithologic reservoirs.
【作者单位】：中国石油大港油田公司勘探开发研究院;
【基金】：中国石油天然气集团公司重大科技专项(2014E-06)
【分类号】：P618.13

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