The Inversion Structures and Their Genetic Mechanisms ofBayindulan Sag, Erlian Basin
Chen Shuguang
Zhang Yiming
Cui Yongqian
Xiao Yang
Qin Fengqi
Lü Desheng
Zu Zhiyong
Li Yong
Abstract：The Geologic structure of Erlian basin has been controversial.To make clear the developmental periods of inversion structure and their genetic dynamic mechanism of Bayindulan sag, Erlian basin in Early Cretaceous, we make use of the new processing of 3D seismic data covering the all sag to identify the important tectonic unconformity interfaces and to make sure the contact relationship between the strata developed in Early Cretaceous.Combined the igneous rock revealing in drilling data, we think that the late 3 rd Member of K1ba Formation, and the late 4 th member of K1ba Formation, the late K1bt1, and the late K1bt2 mainly all developed normal inversion structures.The further studies indicate that the four positive inversion structures in the Early Cretaceous were caused by the developing magmatic diapiric structure under the setting of the regional extensional stress field;while inversion structure in early K1bt2 was typically caused by the regional strike-slip movement.Therefore, the genetic mechanisms of various inversion structures developed in different periods are dissimilar, which was closely coordinated with the subduction of Paleo-Pacific plate to Eurasia, the effects of the magmatic diapiric caused by the metasomatic mantle and regional strike-slip action resulted by the change of subduction direction of Paleo-Pacific plate during the Early Cretaceous period.
Keywords：Bayindulan sagEarly Cretaceousinversion structuregenetic mechanismpetroleum geology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 559-569 )