辽东湾坳陷新近系馆陶组浅水三角洲的发现及其油气勘探意义

doi:10.11743/ogg20170309

摘要/Abstract

摘要： 为突破辽东湾坳陷新近系馆陶组沉积相的早期认识对该区油气勘探下一步进展的制约，以沉积地质、地球物理和古生物相结合的分析方法，详细分析了湖泊及浅水三角洲存在的地质背景和证据。通过辽河坳陷馆陶组和明化镇组下段的沉积模式及可可西里卓乃湖-库赛湖区的现代沉积比较，结合孢粉百分含量法和相对比值法的半定量分析方法所揭示的古湿度和古温度分析结果，认为馆陶组主要是亚热带且湿度逐渐增大的气候条件下，以冲积扇和辫状河为主，具有大平原小前缘特点的浅水三角洲沉积模式。三角洲平原分为以冲积扇为主的上平原和以辫状河为主的下平原，三角洲前缘具有平面规模小、不稳定、河口坝和远砂坝不发育的特征。馆陶组下段封闭型湖泊面积小，以三角洲平原沉积为主；馆陶组上段湖域面积扩大，三角洲前缘更加发育，且次级洼陷之间由辫状河水系连通，呈敞流型湖泊特征。辽东湾坳陷新近系馆陶组浅水三角洲沉积体系的新认识使得前三角洲泥岩发育区可能成为区域性盖层，为下一步大型油气藏的勘探提供重要的地质指导。

关键词: 浅水三角洲, 馆陶组, 新近系, 辽东湾坳陷

Abstract: In order to break through the constraint of the earlier understandings of sedimentary facies on oil and gas exploration in the Neogene Guantao Formation in Liaodong Bay Depression,this paper studied the geological background and the evidences of the occurrence of lake and shallow-water delta through integration of sedimentary geology,geophysics and paleontology.The sedimentary patterns of the Guantao Formation and the Lower Minghua Formation in the Liaohe Depression,as well as the modern sedimentary patterns of the Zhuonai-Kusai Lake area were taken as analogies for comparison,and a semi-quantitative analysis method was used to determine paleohumidity and paleotemperature.It is believed that the Guantao Formation was deposited under subtropical climate conditions with increasing humidity,dominated by alluvial fan and braided river facies,and characterized by sedimentary pattern of shallow-water delta with a large plain and a small front.The delta plain consists of the upper plain dominated by alluvial fan and the lower plain dominated by braided river.The delta front features in small scale,instability,as well as underdeveloped mouth bar and distal bar.The area of closed lake was small during deposition of the lower Guantao Formation and delta plain deposits predominated.In contrast,the area of the open lake was enlarged during deposition of the upper Guantao Formation,delta front was well developed,and the subsags were connected by the braided river system.According to the new understandings on the shallow-water delta sedimentation system of the Neogene Guantao Formation in Liaodong Bay Depression,the front delta mudstone may act as a regional cap rock,providing an important geological guidance for future oil and gas reservoir exploration.

Key words: shallow-water delta, Guantao Formation, Neogene, Liaodong Bay Depression

中图分类号:

TE121.3

钟怡江,陈洪德,徐长贵,等. 辽东湾坳陷新近系馆陶组浅水三角洲的发现及其油气勘探意义[J]. 石油与天然气地质, 2017, 38(3): 499-507. doi: 10.11743/ogg20170309 Zhong Yijiang,Chen Hongde,Xu Changgui,et al. Discovery of shallow-water delta in the Neogene Guantao Formation in the Liaodong Bay Depression and its significance for oil and gas exploration[J]. Oil & Gas Geology, 2017, 38(3): 499-507. doi: 10.11743/ogg20170309

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