Tectonic Evolvement Function to Oil and Gas Pool's Reformation in Xuanhan-Daxian Area, Northeastern Sichuan Basin

Abstract

Abstract:

Xuanhan-Daxian area in northeastern Sichuan basin is one of the most important areas for the petroleum exploration in south China, it has been investigated for many years,and in 2003 it has been proved to be a new area which has plentiful petroleum resource by the well Puguang 1.Based on detailed interpretation of about 500 km2 of three-demension seismic data and tectonic characteristics in northeastern Sichuan basin, according to the structure evolution profile and the similar features of two typical reservoirs of Puguang and Maobachang, the formation and stack of the structure styles in different stages and different stress fields have been studied, Puguang and Maobachang structural traps have their early prototype in later Indosinian Movement epoch, forming in later Yanshanian Movement epoch, being reconstructed in Himalayan Movement epoch. The reconstruction of Himalayan Movement to early carbonate rock reservoirs has been analyzed, especially the reforming function of the evolution of fault and fold system. The research shows that the Himalayan Movement has played a great important role in the structural geometry, tectonic evolution characteristics, fault system and reservoir-cap rock conditions of the carbonate rock reservoirs such as Puguang and Maobachang in Xuanhan-Daxian area.

Key words: Himalayan Movement, reformation;structure characteristics, oil and gas pool, Puguang reservoir, Maobachang reservoir, Xuanhan-Daxian area in northeastern Sichuan basin

CLC Number:

TE121.1

TANG Da-qing,WANG Li-jun,ZENG Tao,FENG Xing-lei. Tectonic Evolvement Function to Oil and Gas Pool's Reformation in Xuanhan-Daxian Area, Northeastern Sichuan Basin[J]. Geoscience, 2008, 22(2): 230-238.

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