摘要
在冀中地区的任丘、河间、饶阳一带,通过广泛地勘探,发现下第三系沙河街组内,有一组厚度不等的碳酸盐岩。岩层厚度薄,岩性变化大,在钻探过程中见到不同程度的油、气显示,在试油过程中,出现了百吨以上的高产油井。通过对各井淡水碳酸盐岩的岩心、岩屑进行染色薄片和铸体薄片的鉴定和成岩主要标志(如重力胶结,淡水方解石胶结,渗滤粉砂和早期溶解作用等)的研究,同时考虑沉积环境和古地貌背景,认识到本区湖相碳酸盐岩作用与油、气储集和分布有密切的关系。
Based on the carbonate section of Shahejie formation on Jizhong subdepress- ion,this paper makes a detailed analysis to their diagenetic environments, distinguishingly diagenetic indicators of air fresh water,their diagenetic proc- esses are divided into three stages (syngenetic,early diagenetic,later diagene- tic) and,diagenetic models are established.It is found obviously that both the diagentic processes and the environments affect the evolution of pore structu- res.The pores between particles and,those between crystals formed during dolomitization are mainly generated in syngenetic stage.The effective pores are formed by leaching-dissolution in influent zone of early diagenetic stage. The pores are reformed in some degree by cementation and recrystalization in late stage.Both above events are the result of diagenetic processes.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1989年第2期24-30,共7页
Petroleum Exploration and Development
