郭局子洼陷湖缘峡谷及其对洼陷储集砂体的贡献
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摘要
对车镇凹陷郭局子洼陷沙河街组进行了精细的三维地震解释,从盆地的构造形态入手,识别出存在于盆地内的2个主要湖缘峡谷,并详细分析了这2条峡谷的形态和沉积充填特征。结合前人对湖缘峡谷发育模式的研究成果,从成因角度确定了在峡谷的影响下洼陷内部形成了辫状河三角洲和湖底扇沉积。在此基础上,进一步研究了湖缘峡谷沉积体系对洼陷内部储集砂体的贡献以及对油气成藏的影响。湖缘峡谷沉积体系对郭局子洼陷的储层具有重要影响,可以形成有利的储盖组合和油气运移通道,具备良好的成藏条件。
Base on the delicate 3D seismic interpretation in Shahejie Formation for Guojuzi Sag of Chenzhen Depression,two main brink canyons were found according to the structural attitude of the basin.The structural attitude and depositional characteristics of these two canyons were analyzed in detail.The braid delta and sublacustrine fan deposits influenced by canyon were recognized inside the sag from the point of genesis based on the research results of the development pattern of brink canyons.Then the effects of brink canyon depositional system on reservoir sandbod-ies and oil-gas accumulation inside the sag were researched.The brink canyon sedimentary system has important influence on the reservoirs in Guojuzi Sag which may result in favorable reservoir-seal combination,oil-gas migration pathway and hydrocarbon accumulation condition.
Base on the delicate 3D seismic interpretation in Shahejie Formation for Guojuzi Sag of Chenzhen Depression,two main brink canyons were found according to the structural attitude of the basin.The structural attitude and depositional characteristics of these two canyons were analyzed in detail.The braid delta and sublacustrine fan deposits influenced by canyon were recognized inside the sag from the point of genesis based on the research results of the development pattern of brink canyons.Then the effects of brink canyon depositional system on reservoir sandbod-ies and oil-gas accumulation inside the sag were researched.The brink canyon sedimentary system has important influence on the reservoirs in Guojuzi Sag which may result in favorable reservoir-seal combination,oil-gas migration pathway and hydrocarbon accumulation condition.
引文
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[2]姜在兴.沉积学[M].北京:石油工业出版社,2003:5.
[3]Van Vagoner J C,Mitchum R M,Campion K M.Siliciclastic se-quence stratigraphy in well logs,cores and outcrops[J].AAPG Methods in Exploration,1990,7(1):55.
[4]刘宪斌,万晓樵,林金逞,等.陆相浊流沉积体系与油气[J].地球科学——中国地质大学学报,2003,24(1):61-66.
[5]张建林,林畅松,郑和荣.断陷湖盆断裂古地貌及物源对沉积体系的控制作用——以孤北洼陷沙三段为例[J].油气地质与采收率,2002,9(4):24-27.
[6]姜慧超,罗佳强.济阳坳陷油气主运移通道及成藏规律研究[J].油气地质与采收率,2005,12(1):18-20.
[7]徐怀民,吴磊,陈民锋,等.砾岩油藏沉积韵律特征及对开发的影响——以百口泉油田百21井区百口泉组油藏为例[J].油气地质与采收率,2006,13(1):20-22.
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