3D Geometrical and Kinematic Characteristics of the Boundary Fault in Nanyang Depression

doi:10.11885/j.issn.1674-5086.2019.07.18.01

Abstract

Abstract: Xinye Fault is a boundary fault in the south of Nanyang Depression, Nanxiang Basin. It is very important to study its 3D geometrical and kinematic characteristics in analyzing the formation and evolution of Nanyang Depression. Based on 2/3D seismic, drilling and logging data, guided by normal fault related fold theory and structural restoration theory, the 3D geometrical and kinematic characteristics of Xinye Fault are analyzed in this paper. According to plane strike, combined with dip angle and fault distance changes, Xinye Fault is divided into three segments, i.e. west, central and east. The fault plane, which could be subdivided into 11 subzones by 2 vertical axial planes and 4 transversal axial planes, is a curved surface consisting of several dip domains. Based on the balanced geologic cross-sections, we established that the west and east segments of this fault developed in the late Cretaceous; the central segment formed in the sedimentary period of Dacangfang Formation in the Eocene, then the three segments linked into one fault. The rotation degree of the fault weakens from east to west. The largest reverse degree appears on the east segment, followed by the central segment and the west segment. The seat-type normal fault form developed in the west segment; the central segment is a turning normal fault instead of listric form and listric in the east segment. The differential subsidence along fault strike and the difference of section shape are important controlling factors for the formation and evolution of Nanyang Depression.

Key words: Nanyang Depression, Xinye Fault, geometrical characteristic, kinematic characteristic, normal fault related fold theory, structural restoration

CLC Number:

TE122

LI Zhi, ZHANG Zhiye, HE Dengfa, LUO Xi, XIONG Jian. 3D Geometrical and Kinematic Characteristics of the Boundary Fault in Nanyang Depression[J]. 西南石油大学学报(自然科学版), 2020, 42(5): 48-62.

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