Analysis of the High Resolution Sequence of Lacuatrine Carbonate

In spite of great economic sigificance, very little is known about the lacustrine carbonate rocks both at home and abroad. By the method of applying sequence stratigraphy, this paper particularly analyses the sequence developing model, sequence gradation division and controlling factors on lacustrine carbonate rocks, and put emphasis on parasequence types, distinguishing symbol, forming mechanism and correlation model. As a result, the sequence model of lacustrine carbonate rocks is summed up as steep slope model and gentle slope model. The units of high-resolution sequence are divided into sequence, tract system, parasequence sets, parasequence and microsequence. The parasequnce types are divided into steep slope type, gentle slope type and deep sag type, also divided into limestone-marl,shore,slipping and deep-water evaporate, and the controlling factor of different kinds of parasequence is different. The contrasting models of parasequence are summed up as abruptly changing model of steep slope and gradually changing model of gentle slope, parasequence can regularly charge under different models.