大民屯凹陷古近系层序地层格架与层序成因分析
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摘要
大民屯凹陷是在前古近系基底上发育的一个新生代富油气凹陷,截止2007年底已探明石油地质储量3.2亿t,其古近系是重要勘探目的层和产层。根据凹陷的构造演化史与地层、沉积发育特征,利用钻井取心、岩屑录井、测井和高分辨率的三维地震资料,将凹陷古近系划分为2个二级层序、7个三级层序。通过精确的速度分析及井震结合,建立了全凹陷古近系等时层序地层格架,并对层序发育的主控因素进行了探讨,认为构造沉降、沉积物供应、湖平面变化与气候等因素共同控制了大民屯凹陷层序的形成,其中构造沉降对层序形成起主要控制作用。高精度层序地层划分与等时格架建立对大民屯凹陷岩性油气藏研究与勘探具有十分重要的指导意义。
Damintun Sag is a hydrocarbon-rich Cenozoic sag developed on a pre-Paleogene base,0.32 billion tons petroleum were found till 2007.Paleogene is the main oil-producing and target layers.According to the tectonic evolution and characteristics of strata and deposition in Damintun Sag,by using drilling cores,cutting logs,well logs and high-resolution 3-D seismic data,2 second-order sequences including 7 third-order sequences were classified in the Paleogene System.By accurate velocity analysis and combination of well and seismic data,a synchronic stratigraphic sequence framework was established,and the main sequence-controlling factors were discussed.Tectonic subsidence,supply of deposits,lake level fluctuation and climate were considered controlling the formation of sequences,and tectonic subsidence was the main factor.The high-precision sequence classification and the foundation of the synchronic stratigraphic sequence framework are of great significance to the exploration and research of lithological reservoirs in Damintun Sag.
Damintun Sag is a hydrocarbon-rich Cenozoic sag developed on a pre-Paleogene base,0.32 billion tons petroleum were found till 2007.Paleogene is the main oil-producing and target layers.According to the tectonic evolution and characteristics of strata and deposition in Damintun Sag,by using drilling cores,cutting logs,well logs and high-resolution 3-D seismic data,2 second-order sequences including 7 third-order sequences were classified in the Paleogene System.By accurate velocity analysis and combination of well and seismic data,a synchronic stratigraphic sequence framework was established,and the main sequence-controlling factors were discussed.Tectonic subsidence,supply of deposits,lake level fluctuation and climate were considered controlling the formation of sequences,and tectonic subsidence was the main factor.The high-precision sequence classification and the foundation of the synchronic stratigraphic sequence framework are of great significance to the exploration and research of lithological reservoirs in Damintun Sag.
引文
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[2]贾承造,赵文智,邹才能,等.岩性油气藏勘探研究的两项核心技术[J].石油勘探与开发,2004,31(3):3-9.
[3]Wilgus C K.层序地层学原理[M].徐怀大等译.北京:石油工业出版社,1993.
[4]蔡希源,李思田,郑和荣,等.陆相盆地高精度层序地层学——隐蔽油气藏勘探基础、方法与实践[M].北京:地质出版社,2003:31-66.
[5]操应长,姜在兴,夏斌,等.利用测井资料识别层序地层界面的几种方法[J].石油大学学报:自然科学版,2003:27(2):23-26.
[6]张世奇,肖焕钦.陆相断陷湖盆中层序边界的形成机理及其识别特征研究[J].江汉石油学院学报,2003,25(1):4-7.
[7]田景春,陈高武,张翔,等.沉积地球化学在层序地层分析中的应用[J].成都理工大学学报:自然科学版,2006,33(1):30-35.
[8]于均民,李红哲,刘震华.应用测井资料识别层序地层界面的方法[J].天然气地球科学,2006,17(5):736-742.
[9]尹太举,张昌民.层序地层格架内的油气勘探[J].天然气地球科学,2005,16(1):25-30.
[10]瞿辉,赵文智.层序格架在油气勘探中的作用[J].石油勘探与开发,2000,27(5):40-43.
[11]覃建雄,吴勇.层序地层学在油气勘探领域中的应用[J].天然气地球科学,1995,6(6):1-12.
[12]崔永谦,武耀辉,罗宁,等.陆相地层岩性油气藏勘探技术[J].中国石油勘探,2004,(3):17-25.
[13]易士威,王权.岩性油气藏勘探思路与勘探方法[J].中国石油勘探,2005,(2):9-15.
[14]池英柳,张万选,张厚福,等.陆相断陷盆地层序成因初探[J].石油学报,1996,17(3):19-26.
[15]胡受权,郭文平,杨凤根,等.试论控制断陷湖盆陆相层序发育的影响因素[J].沉积学报,2001,19(2):256-262.
[16]孙耀庭,张世奇,刘金华,等.陆相可容空间变化及层序发育控制因素分析[J].油气地质与采收率,2005,12(1):3-5.
[17]谢晓军,邓宏文.陆相断陷盆地构造—层序地层研究需注意的几个问题[J].天然气地球科学,2007,18(6):838-842.
[18]覃建雄,陈洪德,田景春.层序成因动力学中的构造因素研究[J].古地理学报,2003,5(1):77-86.
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