鄂尔多斯盆地奥陶系马家沟组五段岩相古地理及有利区带预测
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摘要
鄂尔多斯盆地奥陶系马家沟组五段自上而下分为马五1至马五1010个亚段,其中马五1+2、马五4、马五6、马五8、马五10等亚段处于相对海退期,以发育膏盐沉积为特征,马五3、马五5、马五7、马五9等亚段处于相对海进期,以发育灰岩沉积为特征。综合露头剖面、钻井岩心及岩石薄片的观察,结合测井、地震解释及单因素综合方法,在马五段中识别出16种典型的沉积微相序,建立了相应海进期和海退期沉积模式。勾画出古隆起东侧马五段中组合(马五5—马五10亚段)台内颗粒滩分布。恢复了盆地马家沟组五段内10个亚段的岩相古地理。预测了马家沟组上组合(马五1—马五4亚段)风化壳岩溶储层及中组合白云岩储层发育有利相带的平面分布。
the Ordovician Majiagou Formation can be divided into six members in Ordos Basin,The fifth member,Majiagou Member-5(Ma-5),can be further divided into ten submembers,including Ma-51 to Ma-510,in which the Ma-51+2,Ma-54,Ma-56,Ma-58 and Ma-510submembers deposited during relative regressions,and the Ma-53,Ma-55,Ma-57 and Ma-59 submembers deposited during relative transgressions.The formers are commonly composed of gypsum and salt while the latters are commonly of limestone.Based on the observation of the outcrops,drill cores and thin sections,as well as well logging and seismic interpretation,16 sedimentary microfacies sequences are identified by the single-factor integrated method and then the associated models of transgression and regression are established.The distribution of intraplatform grain beach is sketched in the Middle Assemblage(Ma-55 to Ma-510) on the east side of paleouplift and 10 Majiagou submembers of lithofacies palaeogeography are reconstructed and mapped.The plane distribution of favorable sediment facies belts is predicted for the weathering-crust karst reservoirs in the Upper Assemblage(Ma-51 to Ma-54) and the dolostone reservoirs in the Middle Assemblage of Majiagou Formation.
the Ordovician Majiagou Formation can be divided into six members in Ordos Basin,The fifth member,Majiagou Member-5(Ma-5),can be further divided into ten submembers,including Ma-51 to Ma-510,in which the Ma-51+2,Ma-54,Ma-56,Ma-58 and Ma-510submembers deposited during relative regressions,and the Ma-53,Ma-55,Ma-57 and Ma-59 submembers deposited during relative transgressions.The formers are commonly composed of gypsum and salt while the latters are commonly of limestone.Based on the observation of the outcrops,drill cores and thin sections,as well as well logging and seismic interpretation,16 sedimentary microfacies sequences are identified by the single-factor integrated method and then the associated models of transgression and regression are established.The distribution of intraplatform grain beach is sketched in the Middle Assemblage(Ma-55 to Ma-510) on the east side of paleouplift and 10 Majiagou submembers of lithofacies palaeogeography are reconstructed and mapped.The plane distribution of favorable sediment facies belts is predicted for the weathering-crust karst reservoirs in the Upper Assemblage(Ma-51 to Ma-54) and the dolostone reservoirs in the Middle Assemblage of Majiagou Formation.
引文
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[16]周鼎武,刘良,张成立,等.华北和扬子古陆块中新元古代聚合、伸展事件的比较研究[J].西北大学学报:自然科学版,2002,32(2):109-113.
①冯增昭,等.鄂尔多斯地区马家沟组岩相古地理及白云岩形成机理研究[R].长庆油田,1988.
②马正芳,等.陕甘宁盆地中部地区奥陶系地层划分及风化壳小层对比[R].长庆油田,1989.
[2]付金华,郑聪斌.鄂尔多斯盆地奥陶纪华北海和祁连海演变及岩相古地理特征[J].古地理学报,2001,3(4):25-33.
[3]包洪平,杨承运.鄂尔多斯东部奥陶系马家沟组微相分析[J].古地理学报,2002,2(1)31-42.
[4]侯方浩,方少仙,赵敬松,等.鄂尔多斯盆地中奥陶统马家沟组沉积环境模式[J].海相油气地质,2002,7(1):38-46.
[5]包洪平,杨承运.碳酸盐岩层序分析的微相方法—以鄂尔多斯盆地奥陶系马家沟组为例[J].海相油气地质,2006,5(1/2):153-157.
[6]姚径利,赵永刚,雷卞军,等.鄂尔多斯盆地西部马家沟期层序岩相古地理[J].西南石油大学学报:自然科学版,2008,30(1):33-37.
[7]史基安,邵毅,张顺存,等.鄂尔多斯盆地东部地区奥陶系马家沟组沉积环境与岩相古地理研究[J].天然气地球科学,2009,20(3):317-324.
[8]杨华,付金华,包洪平.鄂尔多斯地区西部和南部奥陶纪海槽边缘沉积特征与天然气成藏潜力分析[J].海相油气地质,2010,15(2):1-13.
[9]万梨,侯明才,陈洪德.靖边气田北部中奥陶统马家沟组五41储层沉积微相组合与储层非均质性控制因素[J].海相油气地质,2012,17(4):39-48.
[10]苏中堂,陈洪德,欧阳征健,等.鄂尔多斯地区马家沟组层序岩相古地理特征[J].中国地质,2012,39(3):623-633.
[11]郭彦如,赵振宇,付金华,等.鄂尔多斯盆地奥陶纪层序岩相古地理[J].石油学报,2012,33(增2):95-109.
[12]唐克东.对内蒙中部地质的某些认识[G].中国地质科学院文集(1981),1983:56.
[13]王东方.关于温都尔庙群内涵、时代问题的讨论及其在板块会聚带构造发展中的意义[J].地质论评,1985,(5):461-468.
[14]王鸿祯,徐成彦,周正国.东秦岭古海域两侧大陆边缘区的构造发展[J].地质学报,1982,56(3):270-280.
[15]张国伟.华北地块南部早前寒武纪地壳的组成及其演化和秦岭造山带的形成及其演化[J].西北大学学报:自然科学版,1988,(5):21-23.
[16]周鼎武,刘良,张成立,等.华北和扬子古陆块中新元古代聚合、伸展事件的比较研究[J].西北大学学报:自然科学版,2002,32(2):109-113.
①冯增昭,等.鄂尔多斯地区马家沟组岩相古地理及白云岩形成机理研究[R].长庆油田,1988.
②马正芳,等.陕甘宁盆地中部地区奥陶系地层划分及风化壳小层对比[R].长庆油田,1989.
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