辽河凹陷东部桃园—大平房地区东营组层序地层及沉积特征
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摘要
采用测井和地震资料及米兰科维奇旋回相结合的方法,对辽河盆地东部凹陷桃园—大平房地区东营组层序地层进行研究,把该区东营组划分为3个三级层序(Sq1、Sq2、Sq3)。通过对自然伽马测井曲线进行频谱分析,发现地层中保存着厚度稳定的地层旋回,地层旋回厚度的变化范围为15.625~25.510 m,且其主要受米兰科维奇旋回的偏心率控制。据此,采用F ischer图解法,求取其可容空间变化速率曲线,指导层序的正确划分。根据单井相、地震相和砂体形态等综合研究的结果,确定Sq1为扇三角洲沉积,Sq2和Sq3为河流相沉积,为有利储层分布预测打下基础。
The sequence stratigraphy of Dongying Formation in Taoyuan-Dapingfang area in the east of Liaohe depression,has been studied through the combination of the logging and seismic data,and Milankovitch cycle,and can be divided into three tertiary sequences as follows Sq1,Sq2 and Sq3.By means of analyses of the spectra of well logs,i.e.GR,it can be deduced that the strata keep steady strata cycles,which are controlled by the eccentricity of the Milankovitch cycle,and the changing thicknesses of the stratigraphic cycles are 15.625 to 25.510 meters.Hereby,the Fischer diagramming method is adopted to get the speed curve of changing accommodation,and then to instruct the accurate division of the sequence.According to the comprehensive study of the single-well facies,seismic facies and the modality of sandstone body,it is indicated that the tertiary sequence Sq1 is a fan delta,and the other two Sq2 and Sq3 are fluvial facies,on which the prediction of the distribution of the profitable reservoir is based.
The sequence stratigraphy of Dongying Formation in Taoyuan-Dapingfang area in the east of Liaohe depression,has been studied through the combination of the logging and seismic data,and Milankovitch cycle,and can be divided into three tertiary sequences as follows Sq1,Sq2 and Sq3.By means of analyses of the spectra of well logs,i.e.GR,it can be deduced that the strata keep steady strata cycles,which are controlled by the eccentricity of the Milankovitch cycle,and the changing thicknesses of the stratigraphic cycles are 15.625 to 25.510 meters.Hereby,the Fischer diagramming method is adopted to get the speed curve of changing accommodation,and then to instruct the accurate division of the sequence.According to the comprehensive study of the single-well facies,seismic facies and the modality of sandstone body,it is indicated that the tertiary sequence Sq1 is a fan delta,and the other two Sq2 and Sq3 are fluvial facies,on which the prediction of the distribution of the profitable reservoir is based.
引文
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[3]Vail P R,Audemard F,Bowman S A,et al.The stratigraph icsignatures of tecton ics,eustasy and sed im entology:an overview[M]//E insele G,R icken W,Seilacher A.Cycles and Eventsin Stratigraphy.Berlin:Springer-Verlag,1991:617-659.
[4]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):6-10.
[5]吴因业.陆相盆地层序地层学分析的方法与实践[J].石油勘探与开发,1997,24(5):7-10.
[6]朱筱敏,王贵文.辽河滩海地区下第三系层序地层学研究[M].北京:石油工业出版社,2000.
[7]胡宗全.层序地层研究的新思路———构造—层序地层研究[J].现代地质,2004,18(4):549-554.
[8]邓宏文,王红亮,祝永军,等.高分辨率层序学———原理及应用[M].北京:地质出版社,2002.
[9]邱桂强,刘军锷,帅萍.米氏旋回基本原理及其在陆相湖盆分析中的应用前景[J].油气地质与采收率,2001,8(5):5-9.
[10]胡受权,陈国能,王英民,等.F ischer图解及其沉积响应的计算机模拟———以泌阳断陷下第三系核三上段为例[J].石油与天然气地质,1999,20(1):70-75.
[11]Sad ler P M,Osleger D A,Montanez L P.On the labeling,length and ob jective basis of F ischer plots[J].Journal of Sed i-m entary Petrology,1993,63(2):360-368.
[12]盛和宜.辽河断陷湖盆的扇三角洲沉积[J].石油勘探与开发,1993,20(3):60-66.
[13]薛叔浩,罗平,杨永泰.辽河坳陷沉积体系与油气分布[J].石油勘探与开发,1997,24(4):19-22.
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