塔里木盆地圈闭特征

CHARACTERISTICS OF TRAP IN TARIM BASIN.

应用“层圈闭”和“块圈闭”的概念对塔里木盆地已发现和钻探的圈闭进行了统计分析，提出了培里木盆地的圈闭分类方案。将已发现的圈闭划分为构造圈闭、非构造圈闭和复合圈闭３大类，包括６个亚类和１８个小类。分析了各构造区的圈闭的形成条件及发育、分布特征，培北隆起的圈闭主要沿盼裂带分布，圈闭的主要层位为新第三系、老第三系、白垩系、三叠系、石炭系和奥陶系，圈闭类型以背斜型和断背斜型为主，兼有潜山型和岩性圈闭。塔中地区的圈闭主要分布在中央断垒背斜带及其南北斜坡区，圈闭主要分布层位为奥陶系和石炭系，奥陶系以潜山型圈闭为主，多分布在南斜坡区；石炭系以背斜及断背斜型圈闭为主，分布在全区。库车坳陷主要由中新生界成排成带的地面构造和规模大、结构复杂的地下构造组成。在已获油气流的圈闭中，背斜圈闭占５４％，断块断鼻圈闭占２２％，岩性圈闭占１５％。

This paper statistically analyzed the discovered and drilling traps by apply-ing the concepts of 'bed trap' and 'block trap' , and presented the classification of trap inTarim basin. The discovered traps were divided into three major types (structural,non-structural and combination traps) . six subtypes and eighteen minor types. The formationcondition, development and distribution of traps in Tabei uplift were analyzed. The trapsin Tabei uplift were mainly distributed along the main fault zone,developed in Neogene .Paleogene, Cretaceous. Triassic, Carboniferous and Ordovician. and dominated by anti-cline type and faultedanticline type. as well as buried hill type and lithologic trap. Thetraps in Tazhong area mainly distributes in central horst anticline zone and its NS slopes ,occurring in Ordovician (dominated by buried hill type trap and distributed in south slope)and Carboniferous (dominated by anticline type and faulted anticline type traps and dis-tributed in all area). The Mesozoic-Cenozoic surface structure in row and large scale com-plex subsurface structure comprise Kuqa depressiojn. Of traps in which oil and gas flowwere discovered, anticline traps take 540% , fault block and fault nose traps 22%, andlithologic traps 15%.