大巴山前陆盆地形成及演化与油气勘探潜力分析
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摘要
根据野外地质调查、地震资料解释以及大量岩心分析化验等资料 ,探讨了大巴山前陆盆地的形成及演化 ,分析了油气勘探潜力。研究结果表明 ,大巴山前陆盆地形成始于燕山中幕 ,盆地演化经历了J1 J12 陆内坳陷湖盆阶段、J22 J3 前陆盆地阶段、K1 N盆地萎缩阶段以及喜马拉雅期最终定型阶段。大安寨段和凉高山组两套优质烃源岩的有机质丰度高 ,有机质类型以Ⅱ1型和Ⅱ2 型为主。侏罗系发育大安寨段、凉高山组自生自储型和下沙溪庙组下生上储型 3套生储盖组合。有利勘探区带包括大巴山前冲断带、川北凹陷带和川中低隆起带。
On the basis of outcrop survey,seismic interpretation and a lot of coring data,the evolution and exploration potential of Dabashan foreland basin were analyzed. This foreland basin was formed in the mid-Yanshan cycle and underwent four stages including J 1—J 1 2 depression stage,J 2 2—J 3 foreland basin stage, K 1*.N basin shrunk and final deformation of thrust-folded end in Himalayan period. In this basin, two sets of high-quality resource rocks developed in the Daanzhai Formation and Lianggaoshan Formation have high abundance of organic matters which mainly contain Ⅱ 1 type and Ⅱ 2 type kerogen. The favorable assemblages of source-reservoir-cap rocks in Jurassic include self-generated and self-reservoir type Daanzhai Formation and Lianggaoshan Formation as well as lower-generated and upper-reservoir type lower Shaximiao Formation. The favorable plays include the thrust belt in Dabashan area,sag in the north Sichuan province and uplift in the central Sichuan province.
On the basis of outcrop survey,seismic interpretation and a lot of coring data,the evolution and exploration potential of Dabashan foreland basin were analyzed. This foreland basin was formed in the mid-Yanshan cycle and underwent four stages including J 1—J 1 2 depression stage,J 2 2—J 3 foreland basin stage, K 1*.N basin shrunk and final deformation of thrust-folded end in Himalayan period. In this basin, two sets of high-quality resource rocks developed in the Daanzhai Formation and Lianggaoshan Formation have high abundance of organic matters which mainly contain Ⅱ 1 type and Ⅱ 2 type kerogen. The favorable assemblages of source-reservoir-cap rocks in Jurassic include self-generated and self-reservoir type Daanzhai Formation and Lianggaoshan Formation as well as lower-generated and upper-reservoir type lower Shaximiao Formation. The favorable plays include the thrust belt in Dabashan area,sag in the north Sichuan province and uplift in the central Sichuan province.
引文
陈国昭.四川陆相盆地结构与演化特征研究.1994,(内部资料).
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[1] 孙肇才.中国中西部中、新生代界前陆类盆地及其含油气性[M ].油气盆地研究新进展学术研讨会.北京:石油工业出版社,2000:150174.
[2] 贾承造,魏国齐,李本亮,等.中国中西部两期前陆盆地的形成及其控气作用[J].石油学报,2003,24(2):1317.
[3] 张渝昌,张荷,孙肇才,等.中国含油气盆地原型分析[M ].南京:南京大学出版社,1997:295317.
[4] 刘翠荣,吴乃苓,周瑾,等.川西前陆盆地形成演化与动力学研究[A].见:周玉琦.朱夏油气地质理论研讨文集[M ].北京:地质出版社,2001:188197.
[5] 陈发景,汪新文.中国西北地区陆内前陆盆地的识别标志[J].现代地质,2004,18(2):151156.
[6] 汪泽成,刘和甫,熊宝贤,等.从前陆盆地充填地层分析盆山耦合关系[J].地球科学—中国地质大学学报,2001,26(1):3339.
[7] 汪泽成,赵文智,张林,等.四川盆地构造层序与天然气勘探[M ].北京:地质出版社,2002:7595.
[8] 马杏垣.中国大地构造论文集[M ].武汉:中国地质大学出版社,1992:2345.
[9] 何建坤,卢华复,朱斌.东秦岭造山带南缘北大巴山构造反转及动力学[J].地质科学,1999,34(2):139153.
[10] 孙肇才.板内形变与晚期成藏—孙肇才石油地质论文集[M ].北京:地质出版社,2003:104128.
[11] 刘和甫,汪泽成,熊保贤,等.中国中西部中、新生代前陆盆地与挤压造山带耦合分析[J].地学前缘,2000,7(3):5572.
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