冀中坳陷深县凹陷古近系沙河街组沙一段沉积相特征
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摘要
冀中坳陷深县凹陷在古近系沙河街组一段沉积时期处于填平补齐阶段,地层厚度变化大,在200～1200m之间,沉积相研究及其分布规律长期制约着勘探工作。为此,在系统的岩心观察与精细描述的基础上,通过测井资料的分析,并结合粒度分析资料对盆地水动力环境和沉积相类型进行了探讨,共识别出3种沉积相类型:辫状河三角洲、扇三角洲和湖泊。采用岩性、电性、地震相结合的研究方法,再现了沙一段4个沉积亚段的沉积相展布规律:辫状河三角洲相主要分布在深泽—刘村低凸起、深南背斜以及宁晋凸起东北部,具有早期"大前缘小平原"、晚期"大平原小前缘"的沉积特征;衡水断层下降盘主要发育扇三角洲沉积;白宋庄洼漕和榆科背斜一带分布滩坝。
During the depositonal period of the Member 1 of Shahejie Formation,Shenxian Sag was in the end stage of rifting and beginning of sag development,where there is a obvious difference of the formation thickness,from 200 m to 1200 m.The distribution of depositional system and sedimentary facies primarily controls the exploration prospect.For this reason,based on a lot of cores observation and specific description,according to logging data and grain size analysis data,hydrodynamic environments and depositional types have been discussed,three types of sedimentary facies have been defined as following braided fluvial delta,fan delta,and lacustrine facies.By the integrated application of petrology,logging and seismic data,distribution of sedimentary facies have been reconstructed:braided fluvial deltas mainly occured in Shenze-Liucun low uplift,Shennan anticline and northeastern Ningjin uplift,and their framework was characterized by "large deltaic front and smaller plain",while "larger plain and smaller front" in the late period;fan deltas developed in the downthrown side of Hengshui fault,while beaches and bars mainly appeared in Baisongzhuang trough and Yuke anticline.
During the depositonal period of the Member 1 of Shahejie Formation,Shenxian Sag was in the end stage of rifting and beginning of sag development,where there is a obvious difference of the formation thickness,from 200 m to 1200 m.The distribution of depositional system and sedimentary facies primarily controls the exploration prospect.For this reason,based on a lot of cores observation and specific description,according to logging data and grain size analysis data,hydrodynamic environments and depositional types have been discussed,three types of sedimentary facies have been defined as following braided fluvial delta,fan delta,and lacustrine facies.By the integrated application of petrology,logging and seismic data,distribution of sedimentary facies have been reconstructed:braided fluvial deltas mainly occured in Shenze-Liucun low uplift,Shennan anticline and northeastern Ningjin uplift,and their framework was characterized by "large deltaic front and smaller plain",while "larger plain and smaller front" in the late period;fan deltas developed in the downthrown side of Hengshui fault,while beaches and bars mainly appeared in Baisongzhuang trough and Yuke anticline.
引文
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华北油田石油地质志编写组.1987.中国石油地质志,卷五[M].北京:石油工业出版社,16-25.
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梁宏斌,崔周旗.2009.冀中坳陷沉积演化与岩性油气藏勘探[J].石油钻采工艺,31(S1):1-8.
杨帆,于兴河,张峰,等.2010.冀中坳陷饶阳凹陷蠡县斜坡带层序地层发育模式及主控因素[J].古地理学报,12(1):82-89.
易定红.2006.饶阳凹陷大王庄地区古近系沙一段至东营组层序地层与沉积体系分析[J].新疆石油天然气,2(4):21-25.
于兴河.2008.碎屑岩系油气储集层沉积学(第二版)[M].北京:石油工业出版社,126-142.
于兴河,姜辉,李胜利,等.2007.中国东部中、新生代陆相断陷盆地沉积充填模式及其控制因素——以济阳坳陷东营凹陷为例[J].岩性油气藏,19(1):39-45.
张文朝,崔周旗,韩春元,等.2001.冀中坳陷老第三纪湖盆演化与油气[J].古地理学报,3(1):45-54.
张振平,陈恭洋.2009.霸县凹陷文安城东地区沙一段—东营组沉积相研究[J].油气地球物理,7(3):33-36.
赵力民,赵贤正,刘井旺,等.2009.冀中坳陷古近系地层岩性油藏成藏特征及勘探方向[J].石油学报,3(4):22-27.
赵贤正.2010.冀中坳陷淀南地区沙河街组一段层序地层及沉积演化[J].石油与天然气地质,31(5):542-551.
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