渤海湾盆地车镇凹陷古近系层序地层与隐蔽油气藏
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摘要
综合利用钻井、古生物、测井和地震资料,将车镇凹陷古近系沙三段—东营组沉积划分为沙三—沙二下、沙二上—东营组2个二级层序,以及沙三下、沙三中、沙三上—沙二下、沙二上—沙一、东三段、东一、二段等6个三级层序。深断陷型三级层序的发育主要受控于多期幕式断陷作用,断陷活动强烈,物源供给充足,深水环境优质生油岩发育,低位域扇体类型多样,层序内体系域构成模式有利于隐蔽油气藏形成。沙三上亚段—沙二下亚段地层为典型的深断陷型三级层序,可划分为低位体系域、湖侵体系域和高位体系域,该时期埕南断层活动强烈,物源供给充足,持续型陡岸沉积特点突出。详细研究了层序对沉积的控制作用、各体系域时期沉积体系发育特点、有利砂体的展布规律。对该时期车镇凹陷隐蔽油气藏有利区带进行预测,提出了4种类型的10个有利区带。
Based on comprehensive study of outcrops, drilling data, ancient life, well logging and seismic data, the Paleogene Es_3-Ed strata of the studied area were divided into two secondary sequences(Es_3-EsL_2, EsU_2-Ed), and six third class sequences(EsL_3, EsM_3, EsU_3-EsL_2, EsU_2-Es_1, Ed_3, Ed_(1-2)). The deep-faulted third class sequence was mainly controlled by the episodic fault depression and are ideal for subtle hydrocarbon reservoirs for their strong rifting activity undergone, abundant sediment supply, rich and excellent source rocks, as well as for their lower-stand fan facies, sequence style and favorable tract making-up models. The upper part of Es_3 to the lower part of Es_2 is a typical deep-faulted third class sequence that can be further divided into LST, TST and HST system tracts. In this sequence, rifting activity was strongest, sediment supply was abundant, depositional features of continuous steep slope was typical. The control of the sequences on sedimentation, the characteristics of the sedimentary system and the spatiotemporal distribution of favorable sandstone bodies are discussed. Favorable districts for subtle hydrocarbon reservoirs are predicted and ten favorable districts of four different types are outlined.
Based on comprehensive study of outcrops, drilling data, ancient life, well logging and seismic data, the Paleogene Es_3-Ed strata of the studied area were divided into two secondary sequences(Es_3-EsL_2, EsU_2-Ed), and six third class sequences(EsL_3, EsM_3, EsU_3-EsL_2, EsU_2-Es_1, Ed_3, Ed_(1-2)). The deep-faulted third class sequence was mainly controlled by the episodic fault depression and are ideal for subtle hydrocarbon reservoirs for their strong rifting activity undergone, abundant sediment supply, rich and excellent source rocks, as well as for their lower-stand fan facies, sequence style and favorable tract making-up models. The upper part of Es_3 to the lower part of Es_2 is a typical deep-faulted third class sequence that can be further divided into LST, TST and HST system tracts. In this sequence, rifting activity was strongest, sediment supply was abundant, depositional features of continuous steep slope was typical. The control of the sequences on sedimentation, the characteristics of the sedimentary system and the spatiotemporal distribution of favorable sandstone bodies are discussed. Favorable districts for subtle hydrocarbon reservoirs are predicted and ten favorable districts of four different types are outlined.
引文
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[2]郭巍,刘招君,董清水,等.断陷湖盆层序地层格架中的油气聚集规律以松辽盆地为例[J].吉林大学学报(地球科学版),2002,32(3):233237.GUO Wei,LIU Zhao jun,DONG Qing shui, et al.Oil and gas gathering rule in the sequence stritagraphicframe of fault depression lacustrine basin an ex ample fromSongliaoBasin[J].Journal ofJilinUniver sity(EarthScienceEdition),2002,32(3):233237.
[3]顾家裕.陆相盆地层序地层学格架概念及模式[J].石油勘探与开发,1995,22(4):610.GU Jia yu.Framework concepts and models of se quence stratigraphy in nonmarine petroliferous basin[J].PetroleumExploration andDevelopment,1995,22(4):610.
[4]薛良清.层序地层学研究现状、方法与前景[J].石油勘探与开发,1995,22(5):813.XUE Liang qing.Current status, methodogy, and fu ture direction of sequence stratigraphy study[J].Pe troleumExploration andDevelopment,1995,22(5):813.
[5]姜在兴,李华启,钱峥,等.层序地层学原理及应用[M].北京:石油工业出版社,1996:4594.JIANG Zai xing,LI Hua qi,QIAN Zheng,et al.Prin ciple and application of sequence stratigraphy[M].Beijing:PetroleumIndustryPress,1996:4594.
[6]关德范,郑和荣,龙胜祥.中国石化东部探区油气勘探潜力分析[J].石油学报,2003,24(2):15.GUAN De fan,ZHENG He rong,LONG Sheng xiang.Analysis on exploration potential for oil and gasin eastern exploration region ofChina petroleum andchemical corporation[J].ActaPetroleiSinica,2003,24(2):15.
[7]李丕龙,张善文,宋国奇,等.济阳成熟探区非构造油气藏深化勘探[J].石油学报,2003,24(5):1015.LI Pei long,ZHANG Shan wen,SONG Guo qi, et al.Exploration potential of nonstructural pools in the ma tured acreage ofJiyang district[J].ActaPetroleiSini ca,2003,24(5):1015.
[8]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):256262.HU Shou quan,GUO Wen ping,YANG Feng gen,etal.Study on influential factors of terrigenous sequenceformation and development in fault depressed lacus trine basin[J].ActaSedimentologicaSinica,2001,19(2):256262.
[9]潘元林,宗国洪,郭玉新,等.济阳断陷湖盆层序地层学及砂砾岩油气藏群[J].石油学报,2003,24(3):1623.PAN Yuan lin,ZONG Guo hong,GUO Yu xin,et al.Terrestrial sequence stratigraphy and lithological de posit group of sandstone inJiyang faulted lacustrinebasin[J].ActaPetroleiSinica,2003,24(3):1623.
[10]朱筱敏,康安,王贵文.陆相坳陷型和断陷型湖盆层序地层样式探讨[J].沉积学报,2003,21(2):283287.ZHU Xiao min,KANG An,WANG Gui wen.Se quence stratigraphic models of depression and faulted down lake basins[J].ActaSedimentologicaSinica,2003,21(2):283287.
[11]宋国奇,纪友亮,赵俊青.不同级别层序界面及体系域的含油气性[J].石油勘探与开发,2003,30(3):3235.SONG Guo qi,JI You liang,ZHAO Jun qin.Oil-bearing degree of different scale sequence boundariesand system tracks[J].PetroleumExploration andDe velopment,2003,30(3):3235.
[12]张善文,隋风贵,王永诗.济阳坳陷古近系陡岸沉积模式[J].沉积学报,2001,19(2):219223.ZHANG Shan wen,SUI FengGui,WANG Yong shi.Depositional models on the steep slope ofPaleo gene,Jiyang sub basin[J].ActaSedimentologicaSin ica,2001,19(2):219223.
[13]姜在兴,陈世悦,操应长,等.沉积学[M].北京:石油工业出版社,2003:257468.JIANG Zai xing,CHEN Shi yue,CAO Ying chang,etal.Sedimentology[M].Beijing:PetroleumIndustryPress,2003:257468.
[14]张家振,王永诗,王学军.渤海湾盆地义和庄凸起北坡成藏特征与油藏分布规律[J].石油实验地质,2003,25(4):362365.ZHANG Jia zhen,WANG Yong shi,WANG Xue jun.Formation and distribution of hydrocarbon reser voirs in the northern slope of theYihezhuang arch,theBohaiwan basin[J].ExperimentPetroleumGeolo gy,2003,25(4):362365.
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