The Structural Characteristics Of Beier Depression And It Is Controlling Of Reservoir

Beier depression in the southern Hailaer basin is rich in hydrocarbon and an important target area. The structural style of Beier depression is very complex, which not only includes all kinds of extensional faults, extensional faulted-depression and faulted-up lift associations ,but also has transverse and longitudinal transfer zones, and reversal structures formed in later period. Making use of theories and methods about extensional structure, the structural geometry and kinematics are studied. Based on the research of geology, by use of LAMDMARK seismic interpretation system, BSMD balanced section software and software of sedimentation history analysis, the characteristics of structural -sedimentary evolution in the Beier depression, the influence of structure on sedimentary system, and especially the influence of transfer zone on source area of bodies and the relation of structure with accumulation of hydrocarbon are analysed. The conclusion can be drawn as follows: 1.Through the analysis of geometry and kinematics, Beier depression is a intra-continental extensional faulted-depression which developed on Hercynide basement. Structural evolution of the Beier of pre-extensional depression in late Jurassic and early Cretaceous era can be divided into three stages: hot up lift stage in late Jurassic, extensional faulted-depression stage in early Cretaceous, and sag stage of post-faulted depression in late Cretaceous. Based on unconformity surface and three sedimentary cycles, the evolution of extensional faulted-depression can be divided into three episodic extension acts and three episodic contraction, among which the latest episodic contraction is the most intense and causes structural reversion. 2.The alternation of extension and contraction occurred during the whole evolution of depression, the three episodic faulted-depression and the three episodic contraction formed in Cretaceous controlled three sedimentary cycles and the superimposition of extensional and reversal structure ,that is the structural styles and sedimentary systems in Beier depression were controlled by episodic extension and contration. 3.In this paper, the transfer zones of extensional systems are studied with emphasis, the types of transfer zone in Beier depression, and it′s influence on...