西南石油大学学报(自然科学版) ›› 1994, Vol. 16 ›› Issue (2): 4-14.DOI: 10.3863/j.issn.1000-2634.1994.02.02

• 地质勘探 • 上一篇    下一篇

鄂中地区下三叠统碳酸盐岩储层成岩作用与孔隙演化

董兆雄1 陈景山1 沈昭国1 方少仙2 陈劲人2 刘岭山2
  

  1. (1.西南石油学院;2.江汉石油勘探开发研究院)
  • 收稿日期:1993-10-12 修回日期:1900-01-01 出版日期:1994-04-20 发布日期:1994-04-20

Diagenesis and Porsity Evolution of Carbonate Rocks of the Lower Triassic at Chenhu-Tuditang,Central Hubei Province,China

Dong Zhao-xiang1 Chen Jing-shan1 Shen Zhao-guo1 Fang Shao-xian2 Chen Jin-ren2 Liu Lingshan2

  

  1. (1.Southwest petroleum Institute;2.Jianghan Petroleum Institute of Exploration and Development)
  • Received:1993-10-12 Revised:1900-01-01 Online:1994-04-20 Published:1994-04-20

摘要:

鄂中沉湖—土地堂地区早三叠世以局限—半局限台地环境为主,有过短暂的台内浅滩环境,东部曾发展为蒸发台地环境.下三叠统主要有微晶灰岩、微晶白云岩,夹少量亮晶鲕粒灰岩,局部硬石膏岩. 经历了海底环境的白云化,胶结、硬石膏化,大气环境的溶蚀,埋藏环境的胶结、溶蚀、白云化、表生环境的溶性等成岩作用过程.大气及浅埋藏环境产生的孔、缝隙多为后来的方解石等充填,对储层贡献甚微. 深理藏环境的扩溶孔的形成及后期构造缝的产生与油气演化大致配套,具有一定的意义,表生环境的溶蚀,保存较好,对储层有较大贡献. 区内下三叠统主要发育裂缝型及裂缝孔洞型两类储层,前者孔隙度低,仅为2%~3%,后者孔隙度可达26%左右,至今仍受大气淡水影响,保存条件差,不利于成截.

关键词: 碳酸盐岩, 成岩作用, 孔隙演化, 沉湖—土地堂地区, 下三叠统

Abstract:

The depositional environments are mainly semi-and complete restricted carbonate and locally evaporate platforms in the early Triassic, and micrite, dolomicrite, and a little of grain-stone and anhydrite in the lower Triassic. Such a formation has experienced dolomitization in the submarine, solution in the meteoric, cementation, corrosion, dolomitization in the hurried environment, and corrosion in the epidiagene environment. The pores and fractures formed in the meteoricand shallow hurried environment are filled with calciter. The solution pores and structural fractures made with the deep hurried environment are approximately synchronous with the oil-gas evolution. Two kinds of reservoirs of' the lower Triassic at Chenhu-Tuditang belong to the fracture reservoir and the fracture-cave reservoir. The porosity of the former is only about 2%一3%,and it is lower than that of the latter. With aporosity of more than 26%,the latter is still affected by the air and. water, hence poor on the preservation of oil and gas.

Key words: carbinate rocks Diagenesis, porosity evolutionsthe Chenhu-Tuditang, the lower Triassic

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