四川盆地大川中地区深层断裂发育特征及其地质意义

doi:10.11743/ogg20130314

Abstract

Abstract: To research the deep-rooted fault system in Dachuanzhong area of Sichuan Basin,2D seismic data of 21 000 km and 3D seismic data of 3 000 km² were interpreted applying the integrated seismic interpretation technique.Three characteristics of the deep-rooted faults were revealed.The deep-rooted faults control the tectonic deformation of the seals.They cut downward into the basement and upward into the Feixianguan Formation and are associated with flower-shaped faults.The deep faults and the shallow ones have distinct characteristics,with the former being high in angle and dominated by strike-slip faults while the latter being relatively low in angle and dominated by reverse faults.A total of 172 faults were interpreted in Dachuanzhong area and their lateral extensions range from 3 to 79 km.The areal distribution of deep faults shows distinct zonation.The first zone is Weiyuan-Ziyang-Suining-Dazu area where the faults are NE-trending or nearly EW-trending.The second is Bazhong-Yilong-Guang'an area where the faults are NW-trending or nearly EW-trending.The third is Pingchang-Dazhou area where the faults are SN-trending.The deep faults control the sedimentary faces belts and the distribution of favorable sedimentary body,communicate the low porosity and tight reservoirs,effectively improve the reservoir properties and increase oil and gas production capacity.They also control the formation of local structural traps and can act as effective migration pathways for hydrocarbons from source rocks to reservoirs and control hydrocarbon accumulation of allogenic source systems.

Key words: integrated seismic interpretation technique, deep fault, Dachuanzhong area, Sichuan Basin

CLC Number:

TE121.1

Yin Jifeng, Gu Zhidong, Li Qiufen. Characteristics of deep-rooted faults and their geological significances in Dachuanzhong area,Sichuan Basin[J]. Oil & Gas Geology, 2013, 34(3): 376-382.

References

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Characteristics of deep-rooted faults and their geological significances in Dachuanzhong area,Sichuan Basin

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