石油与天然气地质 ›› 1990, Vol. 11 ›› Issue (4): 376-392.doi: 10.11743/ogg19900404

• 论文 • 上一篇    下一篇

渤海湾地区下第三系湖相碳酸盐岩及沉积模式

杜韫华   

  1. 胜利石油管理局地质科学研究院
  • 收稿日期:1990-06-25 出版日期:1990-12-25 发布日期:2012-01-16

EOGENE LACUSTRINE CARBONATE ROCKS AND SEDIMENTARY MODEL IN BOHAI BAY REGION

Du Yunhua   

  1. Geological Research Institute, Shengli Petroleum Administration
  • Received:1990-06-25 Online:1990-12-25 Published:2012-01-16

PDF (PC)

524

被引次数

184

摘要：

湖相碳酸盐岩是渤海湾盆地下第三系的重要油气储集层,主要分布在沙河街组四段上部和一段中、下部。有骨架碳酸盐岩、颗粒碳酸盐岩及泥晶碳酸盐岩三大类。骨架碳酸盐岩岩体类型有礁、礁丘和骨架生物层。礁主要分布于水下台地(或隆起)上的清水区,以礁核及礁前微相的储油物性最好,有原生骨架孔隙、生物体腔孔隙及次生溶蚀孔隙等。礁丘分布于盆地或古岛屿的陡坡水域,以礁丘核的厚度最大,孔隙最发育。生物层分布于盆地及古岛屿的缓坡水域,或有陆源碎屑注入的浑水区,厚度较小,孔隙分布比较均匀。颗粒碳酸盐岩岩体类型有滩、堤、坝、沙咀及藻滩等,分布在滨、浅湖区。原生孔隙及次生孔隙都比较发育。泥晶碳酸盐岩由化学沉积及生物化学作用形成,主要分布于深湖和浅湖区,储集空间有层间缝及溶沟。据此建立的湖相碳酸盐岩沉积模式,已在油气勘探中取得实效。

关键词: 湖相碳酸盐岩, 沉积模式, 渤海湾盆地, 下第三系

Abstract:

Lacustrine carbonate rocks,distributed mainly at the upper part of the 4th Member and the middle and lower parts of the 1st Member in the Shahejie Formation,are impor-tant Eogene reservoirs in Bohai Bay Basin.They can be divided into framework,granular and micritic carbonate rocks.The framework carbonate rock bodies consists of reef,mound and framework organism layer.Reefs are predominently distributed in the clear water area on the subaqueous platforms or uplifts,the reef-core and front reef microfacies of which have the best hydrocarbon reserving condition with framework pores,organic visceral pores and solution pores.Mounds are distributed in the steep slope areas of fossilis lands or basins,the cores of which are the greatest in thickness,and the best in pores.Biobeds are distributed in the gentle slope areas of the basin or fossil islands,or in the deep water areas with terrigenous debris.These beds are usually not so thick and the pores are homogenous.The granular carbonate rock bodies,composed of beach,barrier,bar,sandpit and algal beach,etc.with fine primary and secondary pores,are distributed in shoreand shllow lake areas.The micritic carbonate rocks that are formed by chemical and bio-chemical deposition are distributed in shallow to deep lake areas,the reserving spaces in-clude interlayer fractures and solution channels.