新疆石油地质 ›› 1998, Vol. 19 ›› Issue (2): 112-120.

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塔里木盆地不整合面下的碳酸盐岩成岩作用及孔隙特征

艾华国, 兰林英, 张克银   

  1. 地矿部石油地质综合大队 湖北荆沙 434100
  • 收稿日期:1996-05-14 出版日期:1998-04-01 发布日期:2020-11-15
  • 作者简介:艾华国: 高级工程师 石油地质
  • 基金资助:
    * 本文是在“ 八五” 国家重点科技攻关报告《新疆塔里木盆地不整合面特征及控油作用研究》的基础上编写的

DIAGENESIS AND PORE CHARACTERISTICS OF CARBONATE ROCK UNDER UNCONFORMITY IN TARIM BASIN

Ai Huaguo, Lan Linying, Zhang Keyin   

  1. Geologic Team, MGMR, Jingsha, Hubei 434100
  • Received:1996-05-14 Online:1998-04-01 Published:2020-11-15
  • About author:Ai Huaguo, Senior Engineer, Petroleum Geology

摘要: 对塔里木盆地不整合面下的碳酸盐岩成岩作用、成岩作用序列和孔隙特征的研究表明:(1)不整合面下的碳酸盐岩储集层所经历的成岩作用有胶结作用、溶蚀作用、白云石化作用、重结晶作用、压实作用、压溶作用、硅化及硅质充填作用、裂缝及其充填作用。其中胶结作用、压实作用、硅化及硅质充填作用是破坏孔隙的主要成岩作用, 而溶蚀作用(特别是不整合形成时的大气淡水溶蚀作用)、白云石化作用、压溶作用、破裂作用是产生次生孔隙的主要成岩作用。(2)不整合面下的碳酸盐岩储集层进油期的孔隙全为次生型, 主要的孔隙类型有晶间孔、晶间溶孔、胶结物溶孔、基质溶孔、溶洞、溶缝、缝合线。孔径一般为0.01~ 1 mm, 溶洞直径为2 ~ 10 mm, 孔隙度一般为2 %~ 8 %,局部高达15 %.

关键词: 塔里木盆地, 不整合, 碳酸盐岩, 成岩作用, 孔隙演化, 油气运移

Abstract: Studies on diagenesis, sedimentary sequence and pore characteristics of carbonate rock under unconformable surface in Tarim basin showed that:①carbonate reservoir under unconformable surface underwent cementation, denudation, dolomitization, recrystallization, compaction, solution, silicification, filling of siliceous cement and fracture, among which cementation, compaction, silicification and filling of siliceous cement were major diagenesis for destroying pores;denudation(especially air water when unconformi ty formed), dolomitization, solution and fracturing were major diagenesis for forming secondary pores.② The pores in carbonate reservoir under unconformable surface during hydrocarbon migrating were all to be secondary, among which intercrystalline pore, intercrystalline denudation pore, cement denudation pore, matrix denudation, vugular pore, denudation fracture and stylolite were main pore types, with pore diameter of 0.01~ 1 mm and vugular pore diameter of 2~ 10 mm, the porosity of 2%~ 8%, larger than 15% in local area.

Key words: Tarim basin, Diagenesis, Pore evolution, Characteristics