塔里木盆地下古生界白云石化成因机理及模式探讨

白云岩是塔里木盆地下古生界碳酸盐岩中的重要储集岩类，白云石化的成因机理基本有３种类型：（１）毛细管浓缩与渗透回流白云石化；（２）混合水白云石化；（３）晚期深埋藏压实流白云石化。建立相关的成因模式有助于了解、预测白云岩在时间和空间上的展布规律，指导油气勘探。在塔里木盆地不同地区、不同时代的白云岩具有不同的成因机理，其中对储层贡献较大的是晚期深埋藏压实流和混合水白云石化。白云岩深埋地下，具有良好的储集空间，可以形成高产油气藏。

DISCUSSION ON GENETIC MECHA-NISM AND MODEL FOR DOLOMITIZATION, LOWER PALEOZOIC,TARIM BASIN.

Dolomite is an important reservoir rock in the carbonate of the Lower Pale-ozoic, Tarim basin, in which dolomitization took place in (1)capillary concentration andseawater-seepage/reflux. (2)mixedwater, and (3)deeper burial compaction flow at latediagenetic stage. To develop related dolomitization genetic models contributes to under-standing and predicting the distribution of dolomite in time and space, guiding thepetroleum exploration. Dolomites occurred in different areas and different geologic time inTarim basin showed different diagenetic mechanism, in which dolomitization of deeperburial compaction flow and mixed water at late diagenetic stage contributes more to thereservoir rock. Deeper burial dolomite with good pore space can form prolific reservoir.