四川盆地北部开江-梁平海槽边界及特征初探
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摘要
开江-梁平海槽控制着川北地区飞仙关组台缘鲕滩的分布。在地震剖面上,东侧边界为断点、西侧为上超点;在沉积岩石学方面,发育代表盆地相的薄层泥灰岩和代表斜坡相的碎屑流沉积;最早沉积的台缘鲕滩位于江油-梓潼-南充- 邻水-垫江一线;飞仙关组在海槽西侧沉积厚度大于600 m、东侧大干500 m的区域为盆地相沉积。综合多方面的资料, 基本确定开江-梁平海槽的边界:西侧大致为青林1井-白龙1井-思1井-龙会1井一线;东侧为天东10井-川岳83 井-川涪82井一线。海槽东侧边界由断裂形成,随海槽的关闭,其边界位置相对变化较小;海槽西侧边界由斜坡形成,随海槽的关闭,其边界位置逐渐变化。预测川北地区台缘鲕滩发育面积可达3×104km2。在海槽西侧,台缘鲕滩主要分布于江油、广元、梁平和邻水围成的区域内;在海槽东侧,台缘鲕滩主要发育于云阳、万县和通江两河口一带。
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 3×104 km2 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).
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 3×104 km2 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).
引文
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9吴世祥,汤良杰,郭彤楼,等．米仓山与大巴山交汇区构造分区 与油气分布[J]．石油与天然气地质,2005,26(3):361-365 Wu Shixiang, Tang Liangjie, Guo Tonglou, et al. Structural zona-tion and oil/gas distribution in intersecting area of Micang and Da-ba raountains[J]. Oil & Gas Geology, 2005,26(3):361 -365
10魏国齐,杨威,张林,等．川东北飞仙关组鲕滩储层白云石成因 模式[J]．天然气地球科学,2005,16(2):162-166 Wei Guoqi, Yang Wei, Zhang Lin, et al. Doloraization genetic model of Feixianguan oolitic beach reservoirs in northeast Sichuan basin [J]. Natural Gas Geoscience, 2005,16(2) :162 -166
2杨家静,王一刚,王兰生,等．四川盆地东部长兴组-飞仙关组 气藏地球化学特征及气源讨论[J]．沉积学报,2002,20(2): 349-353 Yang Jiajing, Wang Yigang, Wang Lansheng, et al. The origin and geochemical characters of Changxing reef and Feixianguan oolitic beach gas reservoirs in eastern Sichuan basin [J]. Acta Sedimentologica Sinica,2002,20(2):349 -353
3王一刚,刘划一,文应初,等．川东飞仙关组鲕滩储层分布规 律、勘探方法与远景预测[J]．天然气工业,2002,22(增刊): 14-19 Wang Yigang, Liu Huayi,Wen Yingchu, et al. Distribution law, exploration method and prospective prediction of oolitic beach reservoirs in Feixianguan Formation, eastern Sichuan basin[J]. Natural Gas Industry,2002,22(S0) :14 - 19
4杨雨,文应初．川东北开江-梁平海槽发育对T1f鲕粒岩分布 的预测[J]．天然气工业,2002,22(增刊):30-32 Yang Yu,Wen Yingchu. Control of Kaijiang - Liangping trough growth on T1f oolite distribution in northeastern Sichuan basin [J]. Natural Gas Industry,2002,22 (S0):30 - 32
5王兴志,张帆,马青,等．四川盆地东部晚二叠世-早三叠世飞 仙关组礁滩特征与海平面变化[J]．沉积学报,2002,20(2): 249-254 Wang Xingzhi, Zhang Fan, Ma Qing, et al. The characteristics of reef and bank and the fluctuation of sea-level in Feixianguan period of Late Permain - Early Triassic, East Sichuan basin [J]. Acta Sedimentologica Sinica, 2002,20(2):249 -254
6徐言岗,贺自爱,曾凡刚．川东北天然气成藏特征[J]．石油与 天然气地质,2004,25(3):274-278 Xu Yangang, He Ziai,Zeng Fangang. Characteristics of gas accumulation in northeastern Sichuan basin [J]. Oil & Gas Geology, 2004,25 (3):274-278
7陈洪德,覃建雄,田景春,等．中国南方古生界层序地层格架中 的生储盖组合类型及特征[J]．石油与天然气地质,2004,25 (1):62-69 Chen Hongde, Qin Jianxiong, Tian Jingchun, et al. Types and features of source-reaervoir-cap rock combinations in Paleozoic sequence in southern China [J]. Oil & Gas Geology, 2004,25 (1):62-69
8魏国齐,陈更生,杨威,等．川北下三叠统飞仙关组“槽台”沉 积体系及演化[J]．沉积学报,2004,22(2):254-260 Wei Guoqi, Chen Gensheng, Yang Wei, et al. Sedimentary sys- tem of platformal trough in Feixianguan Formation of Lower Trias-sic in northern Sichuan basin and its evolution[ J]. Acta Sedimen-tologica Sinica,2004,22(2):254 -260
9吴世祥,汤良杰,郭彤楼,等．米仓山与大巴山交汇区构造分区 与油气分布[J]．石油与天然气地质,2005,26(3):361-365 Wu Shixiang, Tang Liangjie, Guo Tonglou, et al. Structural zona-tion and oil/gas distribution in intersecting area of Micang and Da-ba raountains[J]. Oil & Gas Geology, 2005,26(3):361 -365
10魏国齐,杨威,张林,等．川东北飞仙关组鲕滩储层白云石成因 模式[J]．天然气地球科学,2005,16(2):162-166 Wei Guoqi, Yang Wei, Zhang Lin, et al. Doloraization genetic model of Feixianguan oolitic beach reservoirs in northeast Sichuan basin [J]. Natural Gas Geoscience, 2005,16(2) :162 -166
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