廊固凹陷断陷期层序地层与沉积充填样式
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摘要
随着勘探程度的提高,岩性地层圈闭已成为中、新生代高成熟盆地的主要勘探对象。开展廊固凹陷层序地层与沉积演化研究,对凹陷内进一步的岩性地层圈闭勘探具有重要意义。以廊固凹陷三维连片地震资料为基础,以层序地层学理论为指导,将该凹陷古近系划分出12个三级层序,每个三级层序又可划分出低位、高位和湖侵3种体系域。由于受构造运动、物源和气候变化影响,凹陷内发育了多种充填样式,形成了扇三角洲、辫状河三角洲、冲积扇等多种沉积相带。研究指出,大柳泉鼻状构造带和河西务西部带是凹陷内岩性地层圈闭发育的有利区带;沙三段和沙四上亚段是凹陷内砂体发育的有利层位,其中SQ3低位体系域的辫状河三角洲砂体、SQ6低位体系域的近岸水下扇砂体及SQ7高位体系域的扇三角洲砂体发育,为岩性地层油藏提供有利的储集空间。
With exploration degree rising, lithological stratigraphic trape have become the main exploration targets in the Mesozoic and Cenozoic high-maturity basins. The study of sequential stratigraphy and sedimentary development of Langgu Depression is of great significance to further exploration of lithological stratigraphic traps in the depression. Based on joint 3D seismic data about Langgu Depression and guided by sequential stratigraphic theories, the Paleogene system of this depression is divided into 12 three-level sequences with each further divided into three area series of low level, high level and lake invasion. Influenced by structural movement, physical sources and climatic changes, a variety of infill patterns developed within the depression, forming various facies belts, such as fan delta, braided river delta, alluvial fan. The study points out that Daliuquan nose structural belt and the western belt of Hexiwu are favorable belts developed in the lithological stratigraphic traps in the depression. Es 3 and the upper subsection of Es 4 are favorable levels of the sand bodies in the depression, with development of braided river delta sand body of SQ3 low level system, near-bank underwater fan sand body of SQ6 low level system and fan delta sand body of SQ7 high level system, providing favorable reservoir space for lithological stratigraphic oil reservoirs.
With exploration degree rising, lithological stratigraphic trape have become the main exploration targets in the Mesozoic and Cenozoic high-maturity basins. The study of sequential stratigraphy and sedimentary development of Langgu Depression is of great significance to further exploration of lithological stratigraphic traps in the depression. Based on joint 3D seismic data about Langgu Depression and guided by sequential stratigraphic theories, the Paleogene system of this depression is divided into 12 three-level sequences with each further divided into three area series of low level, high level and lake invasion. Influenced by structural movement, physical sources and climatic changes, a variety of infill patterns developed within the depression, forming various facies belts, such as fan delta, braided river delta, alluvial fan. The study points out that Daliuquan nose structural belt and the western belt of Hexiwu are favorable belts developed in the lithological stratigraphic traps in the depression. Es 3 and the upper subsection of Es 4 are favorable levels of the sand bodies in the depression, with development of braided river delta sand body of SQ3 low level system, near-bank underwater fan sand body of SQ6 low level system and fan delta sand body of SQ7 high level system, providing favorable reservoir space for lithological stratigraphic oil reservoirs.
引文
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[6]黄婷婷,周文,傅恒,等.廊固凹陷古近系隐蔽油气藏形成级成藏规律研究[J].大庆石油地质与开发,2007,26(6):51～56.
[2]宋荣彩,张哨楠,董树义,等.非补偿陆相断陷盆地层序地层学研究——以廊固凹陷古近系为例[J].地层学杂志,2007,31(3):255～260.
[3]金凤鸣,傅恒,李仲东,等.冀中坳陷廊固凹陷古近系层序地层与隐蔽油气藏勘探[J].矿物岩石,2006,26(4):5～82.
[4]郑敬贵,廊固凹陷古近系地层学研究[D].成都理工大学,2006.
[5]曹敬华,周文,傅恒,等.廊固凹陷旧州——固安构造带沙三段层序地层特征与油气成藏关系[J].大庆石油地质与开发,2007,26(5):29～32.
[6]黄婷婷,周文,傅恒,等.廊固凹陷古近系隐蔽油气藏形成级成藏规律研究[J].大庆石油地质与开发,2007,26(6):51～56.
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