Unconformities and their influence on lower Paleozoic petroleum reservoir development in the Tarim Basin

Successions of unconformities in Ordovician-Cambrian strata. ten unconformities are identified by six methods in Lower Paleozoic in Tarim Basin and they are classified into three orders and four types. Through analyses of the geographic distribution of unconformity types across the geographic extents of the 10 unconformities and their temporal evolution, it was determined that unconformities of various orders have different effects on the development of carbonate karst reservoir beneath these unconformities.