关于川东北深层海相碳酸盐岩溶蚀型孔隙的成因,主要有两种观点:早期的大气淡水溶蚀和浅埋藏白云石化以及晚期的深埋藏流体溶蚀.以二叠系石灰岩和白云岩为例,通过原位模拟实验分析得知:随着埋深、温度的增加,方解石和白云石均趋向于胶结而不是溶蚀,其中方解石胶结程度更高.因此判定深部碳酸盐岩储层总体上发生溶蚀作用而形成孔隙的可能性较小,早期的成岩作用才是形成次生溶蚀的关键.

There are two viewpoints about the genesis of dissolution pore in deep marine carbonate rocks in Northeast Sichuan as follows: (1) Early meteoric water and shallow burial dolomitization; (2) Late burial dissolution of fluid. Through in-situ simulations and experiments on Permian samples,it shows that with the increase of depth and temperature, calcite and dolomite are tend to be cement rather than dissolution, and the calcite cement is of greater extent. Therefore, the possibility of deep dissolution is few, while the early diagenesis is the key to the formation of secondary dissolution. The sedimentary facies of marine strata and the evolution law of secondary pores in deep burial stage should be further explored.