龙门山山前带侏罗系近源冲积体系沉积特征与成因模式
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摘要
基于高分辨率层序地层学理论,综合利用野外露头剖面、钻井剖面、岩心、地球物理、分析化验和测录井等资料,对龙门山山前带侏罗系沙溪庙组地层沉积相进行综合研究。结果表明:沙溪庙组发育冲积扇及辫状河三角洲2种沉积相类型;受古沉积环境的影响,沙溪庙组沉积经历了水体由浅变深、再变浅的演化过程;沙溪庙组发育2个方向的物源体系,短轴方向的物源主要来自龙门山,近长轴方向的物源来自龙门山北段;受物源和古地形的控制,龙门山北段的山前带主要发育辫状河三角洲沉积相,龙门山中—南段的山前带自北西到南东主要发育冲积扇-辫状河三角洲沉积相。
Based on the theory of high-resolution sequence stratigraphy, the sedimentary facies of the Jurassic Shaximiao Formation in the study area were studied by the comprehensive application of outcrop profiles, seismic section, seismic amplitude image, core and drilling data. The results show that there are two kinds of depositional facies in this region, including alluvial fan and braided river delta. Under the influence of paleo-environment, the lake level of the Jurassic Shaximiao Formation in the study area experienced the evolution process from shallow to deep, and then became shallow. During this period, two types of provenance systems were primarily developed in the study area, i.e., short axis provenance from Longmen Mountain and approximate long axis provenance from northern Longmen Mountain. Under the influence of provenance and paleo-topography, the braided river delta was mainly developed in the northern Longmen Mountain Thrust Belt, while the alluvial fan-braided river delta was mainly developed in the central-southern Longmen Mountain Thrust Belt because of provenances and the ancient landform.
Based on the theory of high-resolution sequence stratigraphy, the sedimentary facies of the Jurassic Shaximiao Formation in the study area were studied by the comprehensive application of outcrop profiles, seismic section, seismic amplitude image, core and drilling data. The results show that there are two kinds of depositional facies in this region, including alluvial fan and braided river delta. Under the influence of paleo-environment, the lake level of the Jurassic Shaximiao Formation in the study area experienced the evolution process from shallow to deep, and then became shallow. During this period, two types of provenance systems were primarily developed in the study area, i.e., short axis provenance from Longmen Mountain and approximate long axis provenance from northern Longmen Mountain. Under the influence of provenance and paleo-topography, the braided river delta was mainly developed in the northern Longmen Mountain Thrust Belt, while the alluvial fan-braided river delta was mainly developed in the central-southern Longmen Mountain Thrust Belt because of provenances and the ancient landform.
引文
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[17]李嵘,张娣,朱丽霞.四川盆地川西坳陷须家河组砂岩致密化研究[J].石油实验地质,2011,33(3):274-281.
[18]刘和甫.前陆盆地类型及褶皱-冲断层样式[J].地学前缘,1995,2(3/4):59-68.
[19]郑荣才,朱如凯,翟文亮,等.川西类前陆盆地晚三叠世须家河期构造演化及层序充填样式[J].中国地质,2008,35(2):246-255.
[20]朱筱敏.沉积岩石学[M].4版.北京:石油工业出版社,2008:248-251.
[21]贾进华,顾家裕,郭庆银,等.塔里木盆地克拉2号气田白垩系储层沉积相[J].古地理学报,2001,3(3):67-75.
[22]罗啸泉,李学兵,赵锡奎.川西龙门山构造特征与油气关系[J].石油实验地质,2011,33(4):384-387.
[23]陈竹新,贾东,魏国齐,等.川西前陆盆地中—新生代沉积迁移与构造转换[J].中国地质,2008,35(3):472-481.
[24]徐胜林,侯明才,林良彪,等.川西前陆盆地侏罗纪构造层序地层格架内沉积充填特征[J].岩石学报,2011,27(8):2327-2338.
[25]林小云,魏民生,丰勇,等.四川盆地川西坳陷东坡沙溪庙组油气成藏关键时刻研究[J].石油实验地质,2017,39(1):50-57.
[26]胡烨,袁晓宇,王彦青,等.四川盆地川西坳陷印支早期古隆起发育特征及控油气作用[J].石油实验地质,2018,40(5):650-654.
[2]刘树根,邓宾,李智武,等.盆山结构与油气分布:以四川盆地为例[J].岩石学报,2011,27(3):621-635.
[3]刘君龙,纪友亮,杨克明,等.川西须家河组前陆盆地构造层序及沉积充填响应特征[J].中国石油大学学报(自然科学版),2015,39(6):11-23.
[4]孟昊,钟大康,李卓沛,等.川西坳陷中段上三叠统须家河组须五段层序格架与沉积相[J].地层学杂志,2016,40(3):278-289.
[5]史云清,李宏涛,肖开华,等.川西坳陷中段西部雷四段气藏沉积层序及其对储层的控制[J].东北大学学报,2017,41(1):52-62.
[6]古俊林,郑荣才,罗平,等.川西坳陷中-南段须家河组层序格架与生储盖组合[J].成都理工大学学报(自然科学版),2004,31(3):282-290.
[7]叶素娟,李嵘,张庄.川西坳陷中段上侏罗统蓬莱镇组物源及沉积体系研究[J].沉积学报,2014,32(5):930-940.
[8]刘君龙,纪友亮,张克银,等.川西前陆盆地侏罗系沉积体系变迁及演化模式[J].石油学报,2016,37(6):743-756.
[9]周晓峰,陈波,凡睿,等.四川盆地北部须家河组四段物源体系分析[J].断块油气田,2016,23(3):279-283.
[10]付菊,伍玲,李刚,等.川西坳陷中段合兴场-丰谷地区沙溪庙组沉积相研究[J].岩性油气藏,2014,26(1):75-79.
[11]邹仁洲,李勇,汪正江,等.龙门山前陆盆地南段须五段沉积特征[J].断块油气田,2017,24(6):750-754.
[12]林煜,徐樟有,吴胜和,等.川西坳陷丰谷构造须四段沉积微相及沉积演化[J].断块油气田,2011,18(6):718-721.
[13]刘安然,陈洪德,徐胜林,等.川西坳陷中段上侏罗系遂宁组岩相古地理及砂体展布[J].岩性油气藏,2013,25(1):35-39.
[14]雍云乔,侯明才,王文楷,等.川西坳陷新场气田上三叠统须家河组须四上段沉积微相研究[J].山东科技大学学报(自然科学版),2013,32(2):25-33.
[15]张田,陈恭祥,罗迎春,等.川西坳陷中段上侏罗系蓬莱镇组沉积相展布及演化[J].科学技术与工程,2014,14(21):205-218.
[16]李智武,刘树根,林杰,等.川西坳陷构造格局及其成因机制[J].成都理工大学学报(自然科学版),2009,36(6):645-653.
[17]李嵘,张娣,朱丽霞.四川盆地川西坳陷须家河组砂岩致密化研究[J].石油实验地质,2011,33(3):274-281.
[18]刘和甫.前陆盆地类型及褶皱-冲断层样式[J].地学前缘,1995,2(3/4):59-68.
[19]郑荣才,朱如凯,翟文亮,等.川西类前陆盆地晚三叠世须家河期构造演化及层序充填样式[J].中国地质,2008,35(2):246-255.
[20]朱筱敏.沉积岩石学[M].4版.北京:石油工业出版社,2008:248-251.
[21]贾进华,顾家裕,郭庆银,等.塔里木盆地克拉2号气田白垩系储层沉积相[J].古地理学报,2001,3(3):67-75.
[22]罗啸泉,李学兵,赵锡奎.川西龙门山构造特征与油气关系[J].石油实验地质,2011,33(4):384-387.
[23]陈竹新,贾东,魏国齐,等.川西前陆盆地中—新生代沉积迁移与构造转换[J].中国地质,2008,35(3):472-481.
[24]徐胜林,侯明才,林良彪,等.川西前陆盆地侏罗纪构造层序地层格架内沉积充填特征[J].岩石学报,2011,27(8):2327-2338.
[25]林小云,魏民生,丰勇,等.四川盆地川西坳陷东坡沙溪庙组油气成藏关键时刻研究[J].石油实验地质,2017,39(1):50-57.
[26]胡烨,袁晓宇,王彦青,等.四川盆地川西坳陷印支早期古隆起发育特征及控油气作用[J].石油实验地质,2018,40(5):650-654.
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