大邑地区须二段物源及沉积相探讨
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摘要
大邑地区须二段沉积时期物源体系较四川盆地其他地区简单,且川西南地区须家河组沉积厚度也较盆地其他地区薄。针对现有研究成果有关物源方向存在众多争议的现状,本文从区域沉积背景分析、须家河组野外露头岩性组合特征识别、钻井岩心精细描述、测井相分析、地震反射特征、岩石矿物成分变化等方面入手,认为:①大邑地区及周边区块物源主要来自于盆地西南方,物源区可能为康滇古陆及其周边的古隆起;②研究区须二段处于辫状三角洲前缘环境,有利的储集砂体类型为水下分流河道及河口坝;③受沉积物供应、构造升降运动、以及分流河道频繁迁移的影响,在构造西南翼主要发育水下分流河道,构造主体部位为水下分流河道与河口坝砂体叠置区;④纵向上,两种成因类型的砂体反复叠置,形成了须二段上部连续发育且厚度巨大的砂岩。通过对大邑地区须二段物源及沉积体系的研究,进一步深化了对气藏砂体展布的认识,对今后该区块进一步的勘探具有一定的参考作用。
The sources system is less than the other parts of Sichuan basin during deposition of the 2ndmember of Xujiahe Formation in Dayi area,and the thickness of Xujiahe Formation is also thinner than others in southwest part of Sichuan basin.Since the controversy of the resources during the existing research,this article analyzed through sedimentary background,lithologic association of outcrop,fine distribution of rock cores,electro-facies,seismic reflection feature and atternation of mineralogical composition,it is believed that:①The source is probably the Kangdian ancient land or other palaeohigh around it;② It is considered that the depositional environment is in the front braided delta,and the beneficial sandbody include the underwater distributary channels and the mouth bar;③ Influenced by the amount of sources area,tectonic subsidence,the frequently change of distributary channels,the distributary channels are widely upgrowth in the southwest part of the Dayi structure,and the distributary channels and the mouth bar are overlapped in the main part of the structure;④ The two types sandbodies are frequently overlapped in vertical profile,which formed the continous upgrowth and tremendously sandstone thickness of the 2nd member of Xujiahe Formation.Through the research of sources and sedimentary facies,which deepen the recognition of the sandbody distribution in gas pool,as provided reference for exploration of next phase in this area.
The sources system is less than the other parts of Sichuan basin during deposition of the 2ndmember of Xujiahe Formation in Dayi area,and the thickness of Xujiahe Formation is also thinner than others in southwest part of Sichuan basin.Since the controversy of the resources during the existing research,this article analyzed through sedimentary background,lithologic association of outcrop,fine distribution of rock cores,electro-facies,seismic reflection feature and atternation of mineralogical composition,it is believed that:①The source is probably the Kangdian ancient land or other palaeohigh around it;② It is considered that the depositional environment is in the front braided delta,and the beneficial sandbody include the underwater distributary channels and the mouth bar;③ Influenced by the amount of sources area,tectonic subsidence,the frequently change of distributary channels,the distributary channels are widely upgrowth in the southwest part of the Dayi structure,and the distributary channels and the mouth bar are overlapped in the main part of the structure;④ The two types sandbodies are frequently overlapped in vertical profile,which formed the continous upgrowth and tremendously sandstone thickness of the 2nd member of Xujiahe Formation.Through the research of sources and sedimentary facies,which deepen the recognition of the sandbody distribution in gas pool,as provided reference for exploration of next phase in this area.
引文
[1]刘树根,李智武,刘顺,等.大巴山前陆盆地-冲断带的形成演化[M].北京:地质出版社,2006:11.
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[6]郭兵,刘树根,刘顺,等.龙门山中段前山构造带构造特征及其形成演化[J].岩性油气藏,2008,20(4):59-64.
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[8]李熙喆,张满郎,谢武仁,等.川西南地区上三叠统须家河组沉积相特征[J].天然气工业,2008,28(2):54-57.
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[10]谢继荣,李国辉,唐大海.四川盆地上三叠统须家河组物源供给体系分析[J].天然气勘探与开发,2006,29(4):1-3.
[11]李华启,姜在兴,邢焕清,等.四川盆地西部上三叠统须家河组二段风暴岩沉积特征[J].石油与天然气地质,2003,24(1):81-86.
[12]侯方浩,蒋裕强,方少仙,等.四川盆地上三叠统香溪组二段和四段砂岩沉积模式[J].石油学报,2005,26(2):30-38.
[13]陈辉,田景春,蒋裕强,等.川中地区须二、四段湖相风暴岩沉积特征及其意义[J].新疆石油地质,2008,29(5):581-583.
①李剑波,等.安县-大邑构造带成藏地质条件及勘探目标选择[R].中石化西南油气分公司.2008.
②徐樟有,黄捍东,吴胜和,等.大邑构造须家河组优质储层评价与预测研究[R].中石化西南油气分公司.2008.
③庞雄奇,陈东霞,等.川西坳陷上三叠统须家河组成藏机理与模式研究[R].中石化西南油气分公司,2009.
④李洪波,等.大邑构造须二段地层对比及沉积相研究[R].中石化西南油气分公司勘探开发研究院,2009.
⑤彭军,等.大邑构造须家河组气藏储层评价研究[R].中石化西南油气分公司勘探开发研究院,2009.
⑥何天华,陈绥祖,等.四川盆地川西区大邑雾中山背斜踏勘总结报告[R].四川石油管理局地调处,1966.
[2]龙刚,王兴文,任山,等.网络裂缝酸化技术在DY1井须家河组气藏的应用[J].钻采工艺,2009,32(4):42-48.
[3]陈伟,杨克明,李书兵,等.龙门山南段山前印支晚期隐伏生长褶皱的构造几何模拟与分析[J].科学通报,2009,(3):382-386.
[4]曹烈,曾焱.川西坳陷上三叠统含油气系统[J].新疆石油地质,2005,26(5):520-524.
[5]刘兴刚,谢冰,金燕,等.川西地区南部须家河组测井储层评价研究[J].天然气勘探与开发,2007,30(1):32-37.
[6]郭兵,刘树根,刘顺,等.龙门山中段前山构造带构造特征及其形成演化[J].岩性油气藏,2008,20(4):59-64.
[7]戴勇,李正文,张华军,等.川西南部地区上三叠统构造及断裂特征[J].天然气工业,2006,26(1):43-46.
[8]李熙喆,张满郎,谢武仁,等.川西南地区上三叠统须家河组沉积相特征[J].天然气工业,2008,28(2):54-57.
[9]郭正吾,邓康龄,韩永辉,等.四川盆地形成与演化[M].北京:地质出版社,1996:48-138.
[10]谢继荣,李国辉,唐大海.四川盆地上三叠统须家河组物源供给体系分析[J].天然气勘探与开发,2006,29(4):1-3.
[11]李华启,姜在兴,邢焕清,等.四川盆地西部上三叠统须家河组二段风暴岩沉积特征[J].石油与天然气地质,2003,24(1):81-86.
[12]侯方浩,蒋裕强,方少仙,等.四川盆地上三叠统香溪组二段和四段砂岩沉积模式[J].石油学报,2005,26(2):30-38.
[13]陈辉,田景春,蒋裕强,等.川中地区须二、四段湖相风暴岩沉积特征及其意义[J].新疆石油地质,2008,29(5):581-583.
①李剑波,等.安县-大邑构造带成藏地质条件及勘探目标选择[R].中石化西南油气分公司.2008.
②徐樟有,黄捍东,吴胜和,等.大邑构造须家河组优质储层评价与预测研究[R].中石化西南油气分公司.2008.
③庞雄奇,陈东霞,等.川西坳陷上三叠统须家河组成藏机理与模式研究[R].中石化西南油气分公司,2009.
④李洪波,等.大邑构造须二段地层对比及沉积相研究[R].中石化西南油气分公司勘探开发研究院,2009.
⑤彭军,等.大邑构造须家河组气藏储层评价研究[R].中石化西南油气分公司勘探开发研究院,2009.
⑥何天华,陈绥祖,等.四川盆地川西区大邑雾中山背斜踏勘总结报告[R].四川石油管理局地调处,1966.
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