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四川盆地厚坝侏罗系大型油砂矿藏的成藏主控因素

单玄龙|罗洪浩|孙晓猛|张洋洋|衣健   

  1. 吉林大学 地球科学学院|长春 130061
  • 收稿日期:2010-05-01 出版日期:2010-07-26 发布日期:2010-07-26
  • 作者简介:单玄龙(1969-)|男|安徽全椒人|教授|博士生导师|主要从事石油天然气勘探与开发研究|E-mail:shanxl@jlu.edu.cn
  • 基金资助:

    国土资源部油气战略研究中心项目(2009GYXQ14)

Main Factors of Houba Jurassic Large Oil Sands Reservior in Sichuan Basin

 SHAN Xuan-long, LUO Hong-hao, SUN Xiao-meng, ZHANG Yang-yang, YI Jian   

  1. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2010-05-01 Online:2010-07-26 Published:2010-07-26

摘要:

厚坝侏罗系大型油砂矿藏位于四川省江油市,龙门山北段推覆体构造带的单斜构造单元内,地表出露大量的侏罗系沙溪庙组下段的含油砂岩,经钻井证实油砂资源丰富,油砂层的平均厚度为34.7 m,平均含油率为9.46%,初步估算0~500 m埋深的油砂分布面积为26.79 km2。通过研究区详细的石油地质和地球化学的研究发现,厚坝侏罗系大型油砂矿藏的成藏主控因素为:①寒武系烃源岩为厚坝侏罗系大型油砂矿藏提供了充足的油源;②储集层砂岩含油率高、油砂层厚、储集物性和储集空间良好;③龙门山北段区域构造带控制了油砂成矿带的形成与分布,逆冲断层、节理发育带与高孔隙度中-粗砂岩的良好配置是油砂形成的最有利形成条件,而喜山期构造掀斜、断裂输导和山前剥蚀是油砂形成和保存的必要条件。

关键词: 四川盆地, 厚坝大型油砂矿藏, 侏罗系, 成藏主控因素

Abstract:

Jurassic large oil sands reservior of Houba is located in Jiangyou City of Sichuan Province, and belong to the monoclinic tectonic unit of nappe structural belt in Longmenshan northern section where oil sands of Jurassic Shaximiao Lower Segment outcroppe in surface. There are rich oil sands resources confirmed by drilled wells ,and the average thickness is 34.7 m about oil sands layer, oil rate is 9.46% in average, a preliminary calculation of the oil sands distribution area is 26.79 km2 in depth of 0-500 m.By detailed study in target area,the main factors of Houba Jurassic oil sands reservoir are that ①the Cambrian source rocks provide sufficient oil source for the reservoirforming of Houba Jurassic oil sands; ②high oil rate in reservoir sandstone, large thinckness of oilsand,  good reservoir physical property and space; ③ the regional tectonic belt of Longmenshan north section controls the formation and distribution of oil sands,and the good configuration of thrust fault, joint developed belt and medium-coarse sandstone in high porosity is the most favorable formation condition of oil sands,another Himalayan tectonic tilting, fault transporting and piedmont denudation are necessary conditions of formation and preservation about oil sands.

Key words: Sichuan basin, Houba large oil sands reservior, Jurassic, reservoir-forming main factors

中图分类号: 

  • P618.13
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