渤中凹陷石南地区东营组烃源岩特征及油气勘探意义
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摘要
渤中凹陷石南地区东营组源岩有机质丰度高,属于中等—较好生油岩。油源对比表明,东营组源岩对研究区东营组和浅层油气成藏有重要作用。研究区构造发育演化特征表明,对于浅层油气成藏来说,在没有断层沟通深层沙河街组油源的情况下,东营组生成油气以沟通东营组油源断层以及晚期断层为主要油气运移通道,形成下生上储型油气藏,"花心"断块的油气富集程度比"花瓣"断块要高。所以,浅层油气成藏的关键是运移和圈闭的有效性。对于东营组油气成藏来说,如果圈闭和储层配置良好,也可以通过自生自储的方式捕获来自东营组成熟烃源岩生成的油气。QHD34-4构造东营组蠕虫状地震反射特征的低位域河道砂岩分布广泛,QHD35-2构造钻遇的东营组岩性圈闭含油气性好,这有可能打开渤中凹陷斜坡带东营组岩性圈闭的勘探局面。
The source rock in Dongying Formation of Shinan area in Bozhong Depression has high abundance of organic matter,which is helpful for oil and gas generation and accumulation in Dongying Formation and shallow layers.The tectonic evaluation history shows that the faults which communicated oil source rock of Dongying Formation and the latter fault are the main pathway for the reservoirs of the shallow layers if they did not connect Shahejie Formation.The oil accumulation degree is richer in the middle than that in the edge for the flower fault trap.Hydrocarbon migration pathway and the effectiveness of trap are the key factors for oil and gas accumulation in the shallow layers.If the trap has good coordination with the reservoir,Dongying Formation reservoir could get oil and gas from the oil source rock of Dongying Formation by self-accumulation and self-generation way.The lithologic reservoirs are good in oil accumulation in the QHD35-2 and QHD35-4 structures where more oil and gas resources could be found out.
The source rock in Dongying Formation of Shinan area in Bozhong Depression has high abundance of organic matter,which is helpful for oil and gas generation and accumulation in Dongying Formation and shallow layers.The tectonic evaluation history shows that the faults which communicated oil source rock of Dongying Formation and the latter fault are the main pathway for the reservoirs of the shallow layers if they did not connect Shahejie Formation.The oil accumulation degree is richer in the middle than that in the edge for the flower fault trap.Hydrocarbon migration pathway and the effectiveness of trap are the key factors for oil and gas accumulation in the shallow layers.If the trap has good coordination with the reservoir,Dongying Formation reservoir could get oil and gas from the oil source rock of Dongying Formation by self-accumulation and self-generation way.The lithologic reservoirs are good in oil accumulation in the QHD35-2 and QHD35-4 structures where more oil and gas resources could be found out.
引文
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[13]黄正吉,李友川.渤海湾盆地渤中坳陷东营组烃源岩的烃源前景[J].中国海上油气(地质),2002,12(2):118-124.Huang Zhengji,Li Youchuan.Hydrocarbon source potential ofDongying Formation in Bozhong Depression,Bohai Bay Basin[J].China Offshore Oil and Gas(Geology),2002,12(2):118-124.
[2]米立军,段吉利.渤中坳陷中浅层油气成藏特点及其聚集规律[J].石油学报,2001,22(2):32-37.Mi Lijun,Duan Jili.Characteristics of middle and shallow strataoil-gas reservoirs and oil-gas acumulation rule in the middle areaof Bohai[J].Acta Petrolei Sinica,2001,22(2):32-37.
[3]孙永河,漆家福,吕延防,等.渤中坳陷断裂构造特征及其对油气的控制[J].石油学报,2008,29(5):669-675.Sun Yonghe,Qi Jiafu,LüYanfang,et al.Characteristics of faultstructure and its control to hydrocarbon in Bozhong Depression[J].Acta Petrolei Sinica,2008,29(5):669-675.
[4]邓运华.渤海湾盆地上第三系油藏类型及成藏控制因素分析[J].中国海上油气(地质),2003,17(6):359-364.Deng Yunhua.Types and accumulation controls of Neogene oilreservoirs in Bohai Bay Basin[J].China Offshore Oil and Gas(Geology),2003,17(6):359-364.
[5]徐长贵,姜培海,武法东,等.渤中坳陷上第三系三角洲的发现、沉积特征及其油气勘探意义[J].沉积学报,2002,20(4):588-594.Xu Changgui,Jiang Peihai,Wu Fadong,et al.Discovery and sedi-mentary characteristics of the Neogene delta in Bozhong Depres-sion and its significance for oil and gas exploration[J].Acta Sedi-mentologica Sinica,2002,20(4):588-594.
[6]龚再升,王国纯.渤海新构造运动控制晚期油气成藏[J].石油学报,2001,22(2):1-7.Gong Zaisheng,Wang Guochun.Neotectonism and late hydrocar-bon accumulation in Bohai Sea[J].Acta Petrolei Sinica,2001,22(2):1-7.
[7]项华,徐长贵.渤海海域古近系隐蔽油气藏层序地层学特征[J].石油学报,2006,27(2):11-15.Xiang Hua,Xu Changgui.Sequence stratigraphic characteristicsof subtle oil-gas pool in the Palaeogene of Bohai Sea area[J].Ac-ta Petrolei Sinica,2006,27(2):11-15.
[8]何仕斌,李丽霞,李建红.渤中坳陷及其邻区第三系沉积特征和油气勘探潜力分析[J].中国海上油气(地质),2001,15(1):61-71.He Shibin,Li Lixia,Li Jianhong.Tertiary sedimentology and hy-drocarbon potential in Bozhong depression and its adjacent area[J].China Offshore Oil and Gas(Geology),2001,15(1):61-71.
[9]李友川,黄正吉,张功成,等.渤中坳陷东下段烃源岩评价及油源研究[J].石油学报,2001,22(2):44-49.Li Youchuan,Huang Zhengji,Zhang Gongcheng,et al.Evaluation ofthe lower Dongying source and oil source research in Bozhong De-pression[J].Acta Petrolei Sinica,2001,22(2):44-49.
[10]徐长贵.渤海古近系坡折带成因类型及其对沉积体系的控制作用[J].中国海上油气,2006,18(6):365-371.Xu Changgui.Genetic types of Paleogene slope-break zones andtheir controls on depositional system in Bohai offshore[J].ChinaOffshore Oil and Gas,2006,18(6):365-371.
[11]何仕斌,朱伟林,李丽霞.渤中坳陷沉积演化和上第三系储盖组合分析[J].石油学报,2001,22(2):38-43.He Shibin,Zhu Weilin,Li Lixia.Sedimentary evaluation and Ne-ogene reservoirs-seal assemlage analysis of Bozhong Depression[J].Acta Petrolei Sinica,2001,22(2):38-43.
[12]郝芳,蔡东升,邹华耀,等.渤中坳陷超压-构造活动联控型流体流动与油气快速成藏[J].地球科学———中国地质大学学报,2004,29(4):519-525.Hao Fang,Cai Dongsheng,Zou Huayao,et al.Overpressure-tec-tonic activity controlled fluid flow and rapid petroleum accumula-tion in Bozhong Depression,Bohai Bay Basin[J].Earth Science:Journal of China University of Geosciences,2004,29(4):519-525.
[13]黄正吉,李友川.渤海湾盆地渤中坳陷东营组烃源岩的烃源前景[J].中国海上油气(地质),2002,12(2):118-124.Huang Zhengji,Li Youchuan.Hydrocarbon source potential ofDongying Formation in Bozhong Depression,Bohai Bay Basin[J].China Offshore Oil and Gas(Geology),2002,12(2):118-124.
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