塔里木盆地西南地区侏罗纪原型盆地类型与特征

doi:10.11743/ogg20050624

摘要/Abstract

摘要：

塔里木盆地西南地区处于古亚洲构造域与特提斯构造域的叠加部位。在平面上,侏罗系分布呈带状出露在塔西南南部边缘。塔西南南缘在侏罗纪期间为一个断陷盆地体系,向西应与卡拉库姆地块南缘断陷盆地相连通。侏罗纪时,深水沉积区处于边缘主控正断层断距最大的位置,而河流和沼泽沉积环境则处于相邻断层交叠部位,或主控断层断距较小的部位。断距最大的位置通常在单个断层的中部,而向其两端断距则逐渐减小,所以上盘的沉降幅度也就变小,沉积环境也相应为河流或冲积扇等。塔西南地区侏罗纪地层除发育在山前外,还发育了一系列受断层控制的湖盆。其中,半-深湖相沉积制约了生油岩的发育。

关键词: 地球动力学环境, 原型盆地, 塔西南地区, 塔里木盆地

Abstract:

Southwestern Tarim basin is located in the superposition area of Pal-Asia structural domain and Thetys structural domain.Laterally, Jurassic is in zonal distribution on the southern edge of southwestern Tarim,where a faulted basin system occurred in Jurassic period and might connected with the faulted basin on the southern edge of Karakum landmass to the west.During Jurassic period,deep water sedimentary area was located in a place where the marginal major normal fault had the largest displacement,while fluvial and swamp depositional environments were located on the superposition area of adjacent faults or in a place where the major fault had relatively small displacement.The largest fault displacement usually occurred in the middle part of the fault,and gradually decreased toward both ends of the fault,thus the subsidence occurring on the hanging wall would also decrease,and correspondingly,there would be the sedimentary environments of fluvial or alluvial fan fa-(cies).In addition to the piedmont zone,the Jurassic strata in southwestern Tarim were also developed in a series of fault-controlled lake basins.The development of oil source rocks had been confined to the semi-deep lacustrine sediments.

Key words: geodynamic environment, prototype basin, southwestern Tarim, Tarim basin

中图分类号:

TE111.1

秦都. 塔里木盆地西南地区侏罗纪原型盆地类型与特征[J]. 石油与天然气地质, 2005, 26(6): 831-839. doi: 10.11743/ogg20050624 Qin Du. Types and characteristics of Jurassic prototype basins in southwestern Tarim basin[J]. Oil & Gas Geology, 2005, 26(6): 831-839. doi: 10.11743/ogg20050624

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