川东石炭系碳酸盐岩成岩环境对次生孔隙的影响

INFLUENCES OF DIAGENETIC ENVIRONMENTS ON SECONDARY PORES IN CARBONATE ROCKS OF CARBONIFEROUS IN EAST SICHUAN PROVINCE

论述了川东石炭系埋藏史、碳酸盐岩矿物形态学、岩石学及地球化学特征，对其成岩阶段进行了划分。川东石炭系碳酸盐岩经历了同生、准同生、浅埋藏、深埋藏及表生等成岩环境的演变，其各成岩环境发生的成岩作用差别较大，对次生孔隙的影响也不尽相同。云南运动使已固结的石炭系抬升至表生成岩环境，形成了较为广泛的岩溶角砾白云岩，而印支期深埋藏成岩环境有机质成熟产生大量有机酸。

The burial history, petrography\|cement morphology, petrology and geochemical characteristics show that Carbonate rocks of Carboniferous in East Sichuan province have gone through syngenesis, parasyngenesis, shallow burial, deep burial and hypergene diagenetic environments. There are great differences in the diagenesis of diagenetic environments and in its effect on the secondary pores. The breccia dolomite occurred widely from resolutive rock because of the elevated movement of the earth crust in Yunnan movement in hypergene period. The great amount of organic acids generated in the organic mature stage dissolved away some carbonate minerals while the deep burial diagenetic environment occurred in the Yinzhi movement. They have a great contribution to effective reservoirs in the research area.