DIVIDING THE TRAP TYPES OF TARIM BASIN ACCORDING TO CONFINING MECHANISM

At present, the exposition of most articles on traps lays particular emphasis on the respect of forming mechanism. In this paper, the trap types of Tarim Basin are preliminary divided into two categories and six subcategories according to confining mechanism (i. e. the patterns to confine oil/gas). The two categories are monoconfining layer traps and multiconfining layer traps; and the six subcategories include conformable types (C-type), unconformable types (U-type), conformable+fault types (CT-type). unconformable+fault types (UT-type), conformable-(-unconformable types (CU-type)and conformable+facies change types (CFC-type). Generally speaking, the monoconfining layer traps between the two categories should be the most beneficial type to the storage and accumulation of oils and gases. Among the six subcategories, C-type traps have the best ability to storage and accumulate oils and gases.