按封闭机理划分塔里木盆地的圈闭类型

DIVIDING THE TRAP TYPES OF TARIM BASIN ACCORDING TO CONFINING MECHANISM

目前对圈闭的论述,侧重于形成机理方面的文章较多。本文依据封闭机理(或封闭油气的方式),把塔里木盆地的圈闭类型初步划分为两个大类和6个亚类。两大类为单封闭层圈闭和多封闭层圈闭,6个亚类为整合型(C型)、不整合型(U型),整合+断层型(CT型)、不整合+断层型(UT)、整合+不整合型(CU型)和整合+相变型(CFC型)。一般而言,两大类中单封闭层圈闭应是最有利油气储聚的圈闭类型;6个亚类相比较,则首推C型圈闭储聚油气的能力最佳。

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.