收稿日期: 2013-09-07
修回日期: 2013-12-19
网络出版日期: 2014-08-10
基金资助
国家科技重大专项(编号：2011ZX05005-002-04-01)资助.
Palaeotectonics Pattern in Pre-Cambrian and Its Control on the Deposition of the Lower Cambrian Source Rocks in Tarim Basin
Received date: 2013-09-07
Revised date: 2013-12-19
Online published: 2014-08-10
杨鑫,徐旭辉，陈强路，钱一雄，陈跃，储呈林 . 塔里木盆地前寒武纪古构造格局及其对下寒武统烃源岩发育的控制作用[J]. 天然气地球科学, 2014 , 25(8) : 1164 -1171 . DOI: 10.11764/j.issn.1672-1926.2014.08.1164
Excellent source rocks formed during the rapid transgression at early stage of Cambrian,so they should be controlled by palaeotectonics pattern before the Cambrian deposited significantly.Combined with drilling and outcrop data,we analyzed the early evolution of Tarim Basin from Nanhuaan to Sinian and the palaeotectonics pattern before the Cambrian deposition.Furthermore,the distribution characteristic of source rocks of Yuertusi Formation and Xishanbulake Formation was discussed.The study revealed that several subsidence centers with different sizes and isolated from each other formed one after another in Nanhuaan and Sinian,and most of the subsidence were filled rapidly.The dolomite deposited in Late Sinian could be contrast basically in the region.Most parts of the basin uplifted under the control of the Keping movement in Late Sinian,which causing regional differences in the tectonic geomorphology.An ancient uplift existed in the center of Tarim Basin from west to east before the Cambrian deposition,and it was surrounded by shore shallow carbonate platform.The palaeogeomorphology was characterized by high in the middle and gradually lower to north and to south.The formation of excellent source rocks in Lower Cambrian is closely related to hydrothermal activity-upwelling oceanic current-anoxic events.The palaeotectonics pattern implied that source rocks in Lower Cambrian should distributed stable and widely in northern depression of Tarim Basin.
Key words： Tarim Basin; Yuertusi Formation; Sinian; Resource rocks
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