石油与天然气地质 ›› 1990, Vol. 11 ›› Issue (3): 304-312.doi: 10.11743/ogg19900312

• 论文 • 上一篇    下一篇

论川东地区侏罗系油气藏勘探

陈宗清   

  1. 四川石油地质勘探开发研究院
  • 收稿日期:1989-07-31 修回日期:1990-02-22 出版日期:1990-09-25 发布日期:2012-01-16

JURASSIC HYDROCARBON EXPLORATION IN EAST SICHUAN

Chen Zongqing   

  1. Research Institute of Petroleum Exploration and Development, Sichuan
  • Received:1989-07-31 Revised:1990-02-22 Online:1990-09-25 Published:2012-01-16

摘要:

川中下侏罗统大安寨组和凉高山组油气藏皆分布在半深湖—浅湖相区,川东的情况相似,两者为同一湖盆相同相带的东、西对称部分。储层皆为介壳滩、沙堤和沙坝等形成的致密透镜状介壳灰岩和砂岩。储层裂缝较发育,有裂缝-岩性油气藏。本区虽褶皱强烈,剥蚀严重,但各高陡背斜带间的宽缓向斜内侏罗系储层仍保存完好,其中的低缓和潜伏构造、向斜轴部、潜伏逆断层上端影响带以及挠曲带等,都是寻找裂缝-岩性圈闭油气藏的有利地区。

关键词: 四川盆地, 侏罗系, 油气勘探, 裂缝性油气藏

Abstract:

The oil and gas pools of the Lower Jurassic Daanzhai and Lianggaoshan Formations in central Sichuan are distributed in semi-deep lake and shallow lake facies.The east partis similar to Central Sichuan in this respect.They are two symmetric parts of the same fa-cies zone deposited in the same lake basin.The difference is that exploration level is verylow in East Sichuan.The reservoir beds in the above regions are compact lenticular shell-limestone and sandstone formed by shelly beaches,sand barries and sandbars.Fracturesare well developed in the reservoir beds,formed fracture-lithologic reservoirs.Though thisregion is intensively folded and seriously denuded,the Jurassic reservoir beds inwide-gentle synclines separated from high-steep anticline zones are well preserved.Amongthem,lower and gentle structures,buried structures,the axes of synclines,the affectedzones in the upper end of buried overthrusts and flexural zones are all favourable places toseek for fracture-lithologic trapped hydrocarbon pools.