四川盆地北部开江-梁平海槽边界及特征初探

doi:10.11743/ogg20060116

Abstract

Abstract:

Kaijiang-Liangping trough controls the distribution of platform edge oolitic shoal in the Feixianguan Fm in northern Sichuan basin. It is found from the seismic section that the eastern boundary to be a breakpoint, while the western boundary appears as an onlap point. In respect of sedimentary petrography, basin and slope facies are developed between the two boundaries mentioned above, which are represented by thin bedded marl and debris flow sediment, respectively. The earliest platform edge oolitic shoal deposit is located along Jiangyou-Zitong-Nanchong-Linshui-Dianjiang. The Feixianguan Fm is of basin facies on the western side of the trough with sediments of over 600 m thick and on the eastern side of the trough with sediments of over 500 m thick. Based on various evidences, the western boundary of the trough is basically determined to be approximately along Qinglin 1 well-Bailong 1 well-Si 1 well-Longhui 1 well, while its eastern boundary is a-long Tiandong 10 well-Chuanyue 83 well-Chuanfu 82 well. The trough is bounded by faults in the east, so the boundary location has only a little change in the course of the closing of the trough, while the western boundary is composed of slopes and the boundary location has gradually changed along with the closing of the trough. It is predicted that the area of platform edge oolitic shoal can be up to 3?10⁴km² in the northern Sichuan basin. On the west side of the trough, the platform edge oolitic shoal is mainly distributed in the area encircled by Jiangyou, Guangyuan, Liangping and Linshui; while on the east side of the trough, it is mainly distributed in Yunyang, Wanxian and Lianghekou (of Tongjiang).

Key words: trough, platform edge oolitic shoal, boundary, Feixianguan Fm, northern Sichuan basin

CLC Number:

TE111.2

Wei Guoqi, Chen Gengsheng, Yang Wei, Yang Yu, Jia Dong, Zhang Lin, Xiao Ancheng, Chen Hanlin, Wu Shixiang, Jin Hui, Shen Juehong. Preliminary study of the boundary of Kaijiang-Liangping trough in northern Sichuan basin and its characteristics[J]. Oil & Gas Geology, 2006, 27(1): 99-105.

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Preliminary study of the boundary of Kaijiang-Liangping trough in northern Sichuan basin and its characteristics

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