石油与天然气地质 ›› 2009, Vol. 30 ›› Issue (2): 177-187.doi: 10.11743/ogg20090208

• 中、东部油气勘探 • 上一篇    下一篇

中、上扬子地区地质结构类型与海相层系油气保存意义

沃玉进, 汪新伟   

  1. 中国石油化工股份有限公司 石油勘探开发研究院,北京 100083
  • 收稿日期:2008-09-28 出版日期:2009-04-25 发布日期:2012-01-16
  • 基金项目:

    中国石油化工股份有限公司科研项目(G0800-06-ZS-288)

Geologic configuration types of the middle-upper Yangtze region and their significance for hydrocarbon preservation in marine strata

Wo Yujin, Wang Xinwei   

  1. SINOPEC Exploration and Production Research Institute, Beijing 100083, China
  • Received:2008-09-28 Online:2009-04-25 Published:2012-01-16

摘要:

在前人研究的基础上,综合野外构造剖面、地震-地质解释、钻井资料等,总结出中、上扬子地区发育单层、双层和三层结构等3大类共计11小类的地质结构类型,分5个区带剖析了区内褶皱-冲断带的构造分带性与地质结构类型的展布特征,并简要讨论了不同地质结构的成因,认为地质结构类型差异与变形带内主控断层所滑脱的深度密切相关。不同的滑脱深度决定了该地质结构类型中区域盖层的剥蚀程度及断层对油气保存的性质,从而决定了其油气保存条件。其中,单层稳定结构、双层结构的深部构造、三层结构的中部构造因区域盖层保存完好、主控断层多为烃源断层而具有良好的保存条件,是油气勘探的有利构造带。

关键词: 地质结构类型, 褶皱-冲断带, 保存条件, 中、上扬子地区

Abstract:

Three types (i.e.single-,double-,and three-layer structures) and eleven sub-types of geologic configurations are recognized in the middle-upper Yangtze region based on the previous study and combining field tectonic profiles,seismic-geological interpretations,and drilling data.The structural zonation of the fold-thrust belts and the distribution of these geological configuration types in the study area are expounded in terms of five structural provinces and the genesis of these configuration types is briefly discussed. The differences among these geologic configuration types are closely related to the detaching depths of the major faults within deforming zones,and the latter determines the erosion of regional cap rocks and the role of faults in hydrocarbon preservation for this type of geologic configuration.Among these geologic configuration types,the stable single-layer configuration,the deep structure in the double-layer configuration and the middle structure in the three-layer configuration have excellent preservation conditions,and therefore are potential exploration targets.

Key words: geologic configuration type, fold-thrust belt, preservation condition, the upper-middle Yangtze region

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