廊固凹陷陡坡带古近系砂砾岩体控制因素分析
摘要
廊固凹陷陡坡带砂砾岩体在纵、横向迁移变化快,非均质性强,勘探难度大。通过18口井541 m岩心的系统观察、156口井测井序列的建立、1 km×1 km三维地震测网密度的地震相识别,认为是典型的近岸水下扇沉积体系,并详细分析了该沉积体系的相带展布特征。砂砾岩体总体趋势为向上厚度减薄、层数减少,共识别出五期扇体,多呈条带状沿大兴断层断面分布。由于整体沉积背景的欠补偿沉积特征,每期之间发育有稳定的暗色泥岩段。该近岸水下扇的形成受大兴断层、古构造、古气候、古地形以及物源供给等多种因素的控制,其中湖平面变化特点、大兴断层的分段活动以及特殊的物源供给背景三个因素的匹配对近岸水下扇的形成起到了决定性作用。第二、第三期扇体扇中分布范围广,储集条件好,是开发的有利目标。
The glutenites of nearshore subaqueous fans in the actic area of the Langgu depression migrate rapidly in the vertical and landscape orientations,are strong anisotropism,and difficult to explore.Thus,more study of the characteristics and controlling factors is required.According to the observation 541 m cores in 18 wells by the numbers,the establishment of 156 wells logging sequences,and the recognition of 1 km×1 km density seismic phase,this paper analyses the sediment characteristic and controlling factors on this glutenite at length.This glutenite lies in the dark mudstone,that is,the positive circle of progressive sequence.It can be divided five periods.From the bottom to up,the thickness reduces and the layer numbers become small.Through analysing the cause,the authors think that the formation of nearshore subaqueous fans is under the control of many factors,such as Daxing faults,palaeotectonics,palaeoclimatologics,palaeotopography,and matter supplementation,but three factors interaction is crucial function,that is,the change of lake level,the intense activity of Daxing faults and matter supplementation.The second and third fans are favorable objects in the next exploitation task.
The glutenites of nearshore subaqueous fans in the actic area of the Langgu depression migrate rapidly in the vertical and landscape orientations,are strong anisotropism,and difficult to explore.Thus,more study of the characteristics and controlling factors is required.According to the observation 541 m cores in 18 wells by the numbers,the establishment of 156 wells logging sequences,and the recognition of 1 km×1 km density seismic phase,this paper analyses the sediment characteristic and controlling factors on this glutenite at length.This glutenite lies in the dark mudstone,that is,the positive circle of progressive sequence.It can be divided five periods.From the bottom to up,the thickness reduces and the layer numbers become small.Through analysing the cause,the authors think that the formation of nearshore subaqueous fans is under the control of many factors,such as Daxing faults,palaeotectonics,palaeoclimatologics,palaeotopography,and matter supplementation,but three factors interaction is crucial function,that is,the change of lake level,the intense activity of Daxing faults and matter supplementation.The second and third fans are favorable objects in the next exploitation task.
引文
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[14]赵红格,刘池洋.大兴断裂分段性研究[J].石油与天然气地质,2002,23(4):368-371.
[2]张萌,田景春.“近岸水下扇”的命名、特征及其储集性[J].岩相古地理,1999,19(4):42-52.
[3]孙连浦,刘招君,李本才,等.水下扇岩相特征及形成机制[J].世界地质,2001,20(3):249-256.
[4]张荣红,余素玉,邬金华.陆相湖盆中沉积物供给因素对层序地层分析的影响[J].地球科学中国地质大学学报,1997,22(2):139-144.
[5]PRABIR D.Architecture and facies pattern of a sub-lacustrine fan,J haria Basin,India[J].SedimentaryGeology,2002,148:373-387.
[6]李淳单.家寺油田湖相斜坡扇沉积特征[J].石油大学学报(自然科学版),1999,23(2):11-13.
[7]张舒亭,王锋,黄海华.廊固凹陷西部大兴砾岩体油气藏形成条件研究[J].西安石油学院学报,1998,13(4):31-34.
[8]朱庆忠,李春华,杨合义.廊固凹陷大兴砾岩体成因与油气成藏[J].石油勘探与开发,2003,30(4):34-36.
[9]王连山,朱庆忠.廊固凹陷大兴砾岩体隐蔽油气藏储层预测研究[J].物探化探计算技术,2003,25(4):308-311.
[10]鄢继华,陈世悦,姜在兴.东营凹陷北部陡坡带近岸水下扇沉积特征[J].石油大学学报(自然科学版),2005,29(1):12-16.
[11]张文朝,崔周旗,韩春元,等.冀中坳陷老第三纪湖盆演化与油气[J].古地理学报,2001,3(1):45-54.
[12]周文,付恒,宋荣彩,等.廊固凹陷下第三系层序地层学及隐蔽油气藏勘探方向[R].成都理工大学档案馆,2005.
[13]田景春,陈洪德,覃建雄,等.层序-岩相古地理图及其编制[J].地球科学与环境学报,2004,26(1):6-12.
[14]赵红格,刘池洋.大兴断裂分段性研究[J].石油与天然气地质,2002,23(4):368-371.
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