石油与天然气地质 ›› 1991, Vol. 12 ›› Issue (3): 241-250.doi: 10.11743/ogg19910301

• 论文 •    下一篇

华北中部奥陶纪沉积特征及其天然气生储条件

张国栋, 朱静昌, 王益友   

  1. 同济大学, 上海
  • 收稿日期:1991-02-21 修回日期:1991-03-30 出版日期:1991-09-25 发布日期:2012-01-16

ORDOVICIAN SEDIMENTARY CHARACTERISTICS AND ITS GAS GENERATING AND RESERVOIRING CONDITIONS IN CENTRAL PART OF NORTH CHINA

Zhang Guodong, Zhu Jingchang, Wang Yiyou   

  1. Tongji University, Shanghai
  • Received:1991-02-21 Revised:1991-03-30 Online:1991-09-25 Published:2012-01-16

PDF (PC)

462

被引次数

5

摘要：

本文在分析奥陶纪沉积相类型与特征的基础上,提出形成天然气生、储、盖层的有利岩相带时空展布规律;并用TTI法恢复地层真厚度,建立奥陶系埋藏-热演化模式,从而探讨了有机质向油气转化的条件;最后,研究了天然气的主要储集空间类型以及成岩作用对它的影响,特别是对天然气主要聚集场所——奥陶系顶部古岩溶发育特征进行了分析。

关键词: 沉积相, 天然气, 生储条件, 奥陶纪, 华北

Abstract:

The main sedimentary facies types in Ordovician are supratidal zone subfacies(mainly mudstone-dolomite and gypsum-dolomite flats) , intertidal and subtidal zone subfacies,lagoon-gypsum salt lake subfacies, restricted gulf and open shelf-shallow sea subfacies(includes storm deposit) and shoal subfacies, of which the gypsum-dolomite flat, lagoongypsum salt lake and open shelf-shallow sea storm deposits are more tipical. In order to discuss the conditions of transforming organic matter into oil and gas,the authors have set up burial-thermal evolution models of Ordovician in the east and west parts of the study area by restoring the original thickness of sedimentary stratu with TTImethod. Both of the models show that during Ordovician and after,there existed two or three major burial periods that have been confimed by exploration in Ordos area and the west part of the study area,and have potentially favourable conditions for natural gas.Therefore, while paying attention to self-generated gas in Ordovician,it is worth to notice coal-formed gas from overlying Carboniferous-Permian which may migrate into Ordovician erosional karst zones to accumulate again. It has been shown that karst zones with a lot of pores, vugs (or cavities) and fractures are widespread in top of Ordovician,and has provided the main pore spaces for gas migration and accumulation. Besides, multiple ancient erosional haitus and karst zones were formed inside the Ordovician following the crustul vibration and the phreatic fluctuation during sedimentution,thus providing more reservoir spaces for natural gas.