Characteristics and significance of syngenetic fault segmentation in hydrocarbon accumulation, an example of Yuanyanggou fault in western sag, Liaohe depression
Abstract：To research on the characteristics of segmentation and its controlling effects on the accumulation of hydrocarbons in the syngenetic fault, an analysis was carried out on palaeo-dis- placement and activity history of Yuanyanggou fault using the largest displacement subtraction method, and then compared the regional geology informations. It is proposed that the Yuan- yanggou fault which was affected by the dextral strike-slip structural system induced by Tanlu fault zone in the eastern edge of the Western sag, has the characteristics of dextral extensional- shear, gradual eruptions and segmental extension from west to east along its strike. The west- ern and middle parts grew in Es3-Es4 period, and then stopped growing in Esl-Es2 period,whereas the eastern part was formed in Ed period. However, the three fault segments manifes- ted in a united fault after the Ng period. The results show that the Paleo-aceommodation is more {avorable for the hydrocarbon accumulation because: 1) It provides reservoir space for hydrocarbon accumulation when material resources enter the sag; 2) Its complex deformation forms fault, lithology and complex traps; 3) It controls the formation of transverse anticline structure at the downthrow block, which is an advantage area for hydrocarbon accumulation.
Keywords：syngenetic faultsegmentationlargest displacement subtraction methodwesternsagYuanyanggou faulthydrocarbon accumulation
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 793-799 )