白音查干凹陷下白垩统都红木组都一段砂体的差异性沉积模式  

Differential sedimentary model of sandbodies in the first member of lower Cretaceous Duhongmu Formation in Baiyinchagan sag

作　　者：张立强[1] 严一鸣 熊丽 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《油气地质与采收率》2016年第6期28-33,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"深层油气;非常规天然气成藏规律与有利勘探区评价技术"(2011ZX05008-004)

摘　　要：运用地震解释和地层对比等方法对白音查干凹陷下白垩统都红木组都一段沉积特征进行分析,在对同一体系域不同部位的准层序组类型和相对湖平面变化研究的基础上,提出了砂体的差异性沉积模式。研究结果表明:在都一段沉积时期,白音查干凹陷不同部位相对湖平面的变化具有差异性,在同一体系域内形成了不同类型的准层序组。都一段地震反射结构分带性特征明显,缓坡带西南部的锡林好来地区为中高频中振幅—变振幅中连续地震相,呈逐层进积的特点;而缓坡带东北部的达尔其地区为低频弱振幅低连续地震相,呈逐层退积的特点。都一段沉积时期,锡林好来地区物源供给充足,扇体发育规模较大,都一段粒度向上变粗,总体发育进积式三角洲砂体,形成进积式准层序组;而达尔其地区及北部陡坡带,由于物源供给不足,相对湖平面上升,发育湖侵背景下的退积式三角洲砂体,形成退积式准层序组。砂体展布在缓坡带西南部的锡林好来地区与东北部的达尔其地区呈此消彼长的特点。By seismic reflection interpretation,stratigraphic correlation and study on parasequence sets and relative lakelevel changes,the differences in sandbody distribution patterns were proposed for the1 st member of lower Cretaceous Duhongmu Formation in Baiyinchagan sag. The results show that during the sedimentary period of the 1st member of Duhongmu Formation,the relative lakelevel changes are different in different areas of the basin,different types of parasequencesets in one systems tract are resulted in. The seismic reflection features is different obviously in different part of the1 st member of Duhongmu Formation. The seismic reflection frequency is medium high and the amplitude is moderate and continuous in Xilinhaolai area of southwester gentle slope belt of Baiyinchagan sag,and the formations prograde towards the north layer by layer. But the frequency is low,and amplitude is weak with poor continuity,and the formations retrograde layer by layer in Daerqi area of north eastern gentle slope. When the 1st member of Duhongmu Formation deposited,the provenance was sufficient in the Xilinhaolai area,and thus the fan scale was relatively large and its granularity was coarser with coarsing upwards. Progressive delta sand body developed in the whole area and the progressive parasequence sets were formed in Xilinhaolai area. But in northern steep slope zone of Daerqi area,the provenance supply was poor and the relative lake level ascended,and thus the regressive delta sand body developed and parasequence sets were formed under the progressive lake background. There is a trade-off relationship in the development of sandbodies between westsouth Xilinhaolai area and northeast Daerqi area.

关 键 词：下白垩统 都红木组 相对湖平面 砂体展布 白音查干凹陷 

分 类 号：TE112.24[石油与天然气工程—油气勘探]