摘要
以渤海湾盆地冀中坳陷饶阳凹陷肃宁地区为例，综合岩心、测井和三维地震综合解释资料，开展隐性前积浅水曲流河三角洲地震沉积学特征研究，并总结隐性前积浅水曲流河三角洲沉积模式。肃宁地区古近系沙-上亚段（Es1s）一东三段（Ed3）可识别出8个四级层序，反映湖平面周期性变化。从湖心向湖岸、从湖侵域向高位域，泥岩由灰色变为红色，显示湖水由深变浅。地震反射结构指示湖水变浅：Esl。（SQV3）叠瓦状前积厚度显示湖心水深40～60m；随后叠瓦状前积结构消失，演变为亚平行结构（SQV4-SQV6），反射连续性逐渐变差，反映水深不超过30m。岩心、测井曲线和地层切片分析揭示，与Es1s的SQV3叠瓦状前积浅水曲流河三角洲体系不同，Es1s的SQV4-sQv6为隐性前积浅水曲流河三角洲体系，地震沉积学响应特征主要为分带向湖盆中心推进的河道状和垛状地貌体系，指示分流河道和三角洲垛状体沉积。
The seismic sedimentology characteristics of sub-clinoformal shallow-water meandering river delta can be comprehensively analyzed by core, well logging and 3-D seismic data. This paper summarizes the sedimentary pattern of sub-clinoformal shallow-water meandering river delta of Suning area in Raoyang sag, Jizhong depression of Bohai Bay Basin. In Suning area, there are eight fourth-order sequences recognized from the upper part of Sha 1 Member （Esls） to Dong 3 Member （Ed3）, reflecting periodical change of lake level. From the central lake to the shore, and from the transgressive to highstand systems tracts, the color of mudstones varies from grey to red, showing a drop of lake-level. The seismic reflection pattern indicates the drop of lake level： the shingled reflections in Esl~ （SQ V 3） indicate water depth of 40-60 m in the lake center, followed by sub-parallel （SQ V 4-SQ V 6） with lower continuity reflections, and disappearance of shingled reflections, showing water depth no more than 30 m. Analysis of core, well logging, and seismic amplitude strata slices reveal that the sequences SQ V 4-SQ V 6 of ESlS are sub-clinoformal shallow-water meandering river delta, different from the shingled reflection shallow-water meandering river delta in SQV3 of Esls. The main seismic sedimentology characteristics are channel forms and lobate landforms advancing to the central lake by multiple zones, indicating numerous distributary channel and deltaic lobes depositions.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2015年第5期566-576,共11页
Petroleum Exploration and Development
基金
国家自然科学基金项目(41272133)
国家科技部油气重大专项(2011ZX05001-002-03
2011ZX05006-005)
中国石油天然气股份有限公司科技项目(2014E-035)
关键词
浅水曲流河三角洲
隐性前积地震反射
地震沉积学特征
饶阳凹陷
渤海湾盆地
shallow-water meandering river delta
sub-clinoformal seismic reflection
seismic sedimentology characteristics
Raoyang sag
Bohai Bay Basin
