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 • Previous Articles     Next Articles

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

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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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