石油实验地质2017，Vol.39Issue(4)：444-452,9.DOI:10.11781/sysydz201704444
塔里木盆地中北部断裂体系划分及形成机制探讨
Classification and formation mechanism of fault systems in the central and northern Tarim Basin
摘要
Abstract
This paper described the horizontal and vertical characteristics of fault systems in the central and northern Tarim Basin, and analyzed the structural model, formation mechanism and evolution history of the fault systems based on extensive 2D/3D seismic data.Four series of fault systems were preliminarily classified.(1) The "X"-type strike-slip fault system (Ⅰ1) in the Tuoputai area is composed of nearly NNE, NNW trending "X"-style conjugate shear fractures and "1"-style vertical structures and positive flower structures in the Lower Paleozoic strata, and are composed of NNE trending en-echelon extension fractures and negative flower structures and graben-horst structures in the Mesozoic and Cenozoic strata.(2) The NW trending thrust fault system (Ⅰ2) in the central Tarim area is composed of nearly NW trending basement-involved and cover-slipping thrust faults and "Y"-style structures.(3) The NE trending strike-slip fault system (Ⅰ3) in the Shuntuo area is composed of nearly NE trending left-lateral strike-slip faults and "1"-style vertical structures and positive flower structures in the Ordovician and lower strata, and is composed of ENE trending en-echelon extensional fractures and negative flower structures and graben-horst structures in the Silurian-Devonian strata.(4) The "T"-type fault system (Ⅰ4) in the Tahe subsalt area is composed of nearly EW trending thrust faults and nearly NS, NNE trending strike-slip faults in the Lower Paleozoic strata, and is composed of NNE,nearly SN trending en-echelon extensional fractures in the Mesozoic and Cenozoic strata.The study of fault system illustrated the superimposition and transformation between extensional strike-slip and transtensional strike-slip, and considered that it was mainly controlled by five stages of subduction and collision orogeny in the paleo oceanic basin on the basin margin.Combined with the dynamic evolution mechanism of the study area, the evolution stage of the central and northern Tarim Basin was divided into the strong compression-weak strike-slip period (the Middle-Late Ordovician), the strong compression-strong strike-slip period (the Late Silurian-Middle Devonian), the strong extension-weak strike-slip period (the Late Carboniferous-Early-Mid Permian), the strong compression-weak strike-slip period (the Late Permian-Triassic), the weak compression-weak strike-slip period (the Jurassic-Neogene).关键词
走滑断裂/断裂体系/形成机制/构造演化/塔里木盆地中北部Key words
strike-slip fault/fault system/formation mechanism/tectonic evolution/central and northern Tarim Basin分类
能源科技引用本文复制引用
吕海涛,张哨楠,马庆佑..塔里木盆地中北部断裂体系划分及形成机制探讨[J].石油实验地质,2017,39(4):444-452,9.基金项目
国家重点基础研究发展计划"973计划"项目(2012CB214800)和国家科技重大专项(2011ZX05005-004)资助. （2012CB214800）
