关键词: 碳酸盐岩, 沉积微相, 储渗单元, 石炭系, 川东地区, 岩相组合

Abstract:

The Carboniferous gas reservoir is the key one in Shaguanping gas field，eastern Sichuan，it belongs to fractureporetyped gas reservoir.It is critically important to divide reservoir units that study systematically the internal texture，spatial allocation and sedimentary facies model of Huanglong Formation and identify the distribution law of the units.Based on the data of geology，well logging and thin sections，by using sedimentary system analysis，lithologic facies association and sedimentary environment of Huanglong Formation are studied in detail，three subfacies and eight microfacies are figured out，all the sedimentary features and conditions of the subfacies are researched.The reservoir permeability units in Carboniferous gas reservoirs are grouped into highmedium permeable zones and low permeable zone，in general，the units appear “high

permeability internally and low permeability marginally”.The division provides scientific reference for middlelate period development.

Key words: carbonate rock, sedimentary facies, reservoir and permeability units, Carboniferous, eastern Sichuan area, lithologic facies association