石油学报 ›› 2012, Vol. 33 ›› Issue (3): 404-413.DOI: 10.7623/syxb201203009

• 地质勘探 • 上一篇    下一篇

关键成藏期碎屑岩储层古孔隙度恢复方法

渠冬芳 1,2 姜振学 1,2 刘惠民 3 高永进 3   

  1. 1 中国石油大学地球科学学院 北京 102249;2 中国石油大学油气资源与探测国家重点实验室 北京 102249;3 中国石化胜利油田公司地质科学研究院 山东东营 257061
  • 收稿日期:2011-11-29 修回日期:2012-02-24 出版日期:2012-05-25 发布日期:2012-07-20
  • 通讯作者: 渠冬芳
  • 作者简介:渠冬芳,女,1986年1月生,2008年毕业于中国石油大学(华东),现为中国石油大学(北京)在读博士研究生,主要从事油气成藏机理与分布规律方面的研究工作。
  • 基金资助:

    国家自然科学基金项目(No.40972088)和国家重点基础研究发展规划(973)项目(2011CB201100)资助。

A reconstruction method of porosity for clastic reservoirs during the crucial period of hydrocarbon accumulation

QU Dongfang 1,2 JIANG Zhenxue 1,2 LIU Huimin 3 GAO Yongjin 3   

  • Received:2011-11-29 Revised:2012-02-24 Online:2012-05-25 Published:2012-07-20

摘要:

油气的成藏过程是地质历史时期的事件,恢复储层在地质历史时期,尤其是在关键成藏期的孔隙度可以帮助定量恢复成藏期的地质条件,更好地认识油气成藏的过程。笔者以将今论古的地质思想为指导,创建了关键成藏期储层孔隙度的恢复方法。以东营凹陷沙河街组四段上亚段(简称沙四上亚段)储层为例,在对其成岩作用类型和成岩阶段划分的基础上,分别对处于不同成岩阶段的一定深度下的储层孔隙度影响因素进行分析,提出了孔隙度综合影响因子的新概念;建立了在孔隙度综合影响因子约束下的孔隙度演化曲线;最后利用此孔隙度演化曲线,对东营凹陷草11—王59剖面上的沙四上亚段储层在几个关键成藏期的古孔隙度进行了恢复。结果表明,用该方法进行的古孔隙度恢复取得了较好的效果。

关键词: 古孔隙度恢复, 关键成藏期, 成岩作用, 孔隙度综合影响因子, 东营凹陷

Abstract:

A hydrocarbon accumulation process is an event of geological history. In order to better understand this event, the reconstruction of reservoir porosity during geological history, especially in a crucial period of hydrocarbon accumulation, can help in quantitatively reconstructing geological conditions of hydrocarbon accumulation. Based on a geological thought of “uniformitarianism”, the present paper established a new method to reconstruct reservoir porosity of the crucial hydrocarbon accumulation. Taking the 4th member of the Shahejie Formation as an example and based on its classification of diagenetic types and stages, we proposed a new concept of combined porosity influencing factor(F for short) by investigating factors that influence the porosity of sandstones with a certain depth at different diagenetic stages, established an evolutionary curve of porosity that is restricted by combined porosity influencing factors, and finally reconstructed the paleo-porosity in crucial hydrocarbon accumulation periods for the 4th member of the Shahejie Formation in the Cao 11-Wang 59 section of the Dongying sag by applying this porosity evolutionary curve. The result shows that the application of this method can achieve a convincing result in reconstructing paleo-porosity.

Key words: paleo-porosity reconstruction, crucial period of hydrocarbon accumulation, diagenesis, combined porosity influencing factor, Dongying sag