济阳坳陷陈家庄凸起东南坡古冲沟沉积充填特征
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摘要
利用最新的三维地震和钻井、测井等资料 ,对济阳坳陷陈家庄凸起东南坡古冲沟的地质特征和沉积充填特征进行了探索性研究。边界大断层———陈南断裂的活动控制冲沟的形成。边界断层活动初期 ,冲沟内充填有近源快速堆积的冲积扇扇根的粗碎屑砂体。断陷的扩张深陷期 ,靠近冲沟的底壁和测壁为稍长反射段的杂乱地震相 ,为扇三角洲根部较粗的砂质碎屑。湖盆收缩或萎缩期 ,冲沟内部发育有极强振幅、平行、高连续的反射相 ,冲沟的充填相与东营凹陷的河流 三角洲淤浅沉积相吻合 ,构成一个完整的沉积体系。在对古冲沟的地质特征和沉积充填特征进行研究的基础之上 ,对古冲沟的油气储集性能进行了概要评价 ,认为冲沟内由同沉积断层的逆牵引作用所形成的逆牵引背斜与冲沟内常见的前积相反射砂体和深湖相泥页岩相配置 ,可能构成有利的油气聚集部位。
In this paper, the geological and sedimentary characters of ancient gullies in the south slope of Chenjiazhuang heave in Jiyang Depression have been studied based on the new three dimension seismic data and logging data collected in Shengli Oil Field. The seismic and sedimentary faces of the three ancient gullies in different structural stage and in different basin evolvement stage are summarized. By combining sedimentary environment and sedimentary system in the same period, the paper demonstrates the possible sedimentary phases in the ancient gullies. At the early development stage of the boundary fault—Chennan fault, the gullies were filled with Kongdian Formation and the forth sect of Shahejie Formation sediment. The sediment in the gullies was coarse crumb sand body or conglomerate of the root of fan-delta with disorder laminate, different amplitude and short reflections. At the most active stage of the boundary fault, which corresponding to the Denying Sag's deep depressed stage, the gullies were filled with the third and the second sect of Shapelier Formation. The Denying Sag was a starve basin at this stage, so the front accumulate reflections are very developed in the gullies with continuous reflection and large amplitude. The sedimentary faces in gullies are coarse sand body of delta interbedded with fine sang body of shallow lake. At the shrinkage stage of the Dongying Sag, the activity of boundary fault was subdued. The gullies filled with river-delta phase with the strong, parallel and continuous reflections at this stage. As the cover layer of the gullies, the upper sects of Dongying Formation are also strong, parallel and continuous reflection. In the end, the paper appraises the oil accumulation ability of the three ancient gullies. Reverse-dragging anticline developed in 3 gullies, front accumulation sand body, deep-lake- phase mud and shale may compose the advantageous oil accumulation section.
In this paper, the geological and sedimentary characters of ancient gullies in the south slope of Chenjiazhuang heave in Jiyang Depression have been studied based on the new three dimension seismic data and logging data collected in Shengli Oil Field. The seismic and sedimentary faces of the three ancient gullies in different structural stage and in different basin evolvement stage are summarized. By combining sedimentary environment and sedimentary system in the same period, the paper demonstrates the possible sedimentary phases in the ancient gullies. At the early development stage of the boundary fault—Chennan fault, the gullies were filled with Kongdian Formation and the forth sect of Shahejie Formation sediment. The sediment in the gullies was coarse crumb sand body or conglomerate of the root of fan-delta with disorder laminate, different amplitude and short reflections. At the most active stage of the boundary fault, which corresponding to the Denying Sag's deep depressed stage, the gullies were filled with the third and the second sect of Shapelier Formation. The Denying Sag was a starve basin at this stage, so the front accumulate reflections are very developed in the gullies with continuous reflection and large amplitude. The sedimentary faces in gullies are coarse sand body of delta interbedded with fine sang body of shallow lake. At the shrinkage stage of the Dongying Sag, the activity of boundary fault was subdued. The gullies filled with river-delta phase with the strong, parallel and continuous reflections at this stage. As the cover layer of the gullies, the upper sects of Dongying Formation are also strong, parallel and continuous reflection. In the end, the paper appraises the oil accumulation ability of the three ancient gullies. Reverse-dragging anticline developed in 3 gullies, front accumulation sand body, deep-lake- phase mud and shale may compose the advantageous oil accumulation section.
引文
[1] 王 涛.中国东部裂谷盆地油气藏地质[M].北京:石油工业出版社,1997.
[2] 薛荣俊,张维冈.古冲沟沉积扇体地震反射资料研究[J].海洋地质与第四纪地质,1999,19(2):115118.
[3] 崔黎明,王 萍,潘祖寿.贺兰山东麓裂点溯源迁移规律及其形成年龄的讨论[J].地震地质,1990,12(1):8795.
[4] 纪友亮,张世奇.陆相断陷湖盆层序地层学[M].北京:石油工业出版社,1996.
[5] LiSanzhong,XuShumei,ShanYehua.Basinassemblagesandtec tonicevolutionintheBohaiGulfanditsneighbours[J].ActaO ceanologicaSinica,2000,19(4):9199.
[6] 张善文,隋风贵,王永诗.济阳凹陷下第三系陡岸沉积模式[J].沉积学报,2001,19(2):219223.
[7] 赵徽林,刘孟慧.东濮凹陷下第三系砂体微相和成岩作用[M ].东营:华东石油学院出版社,1988.
[2] 薛荣俊,张维冈.古冲沟沉积扇体地震反射资料研究[J].海洋地质与第四纪地质,1999,19(2):115118.
[3] 崔黎明,王 萍,潘祖寿.贺兰山东麓裂点溯源迁移规律及其形成年龄的讨论[J].地震地质,1990,12(1):8795.
[4] 纪友亮,张世奇.陆相断陷湖盆层序地层学[M].北京:石油工业出版社,1996.
[5] LiSanzhong,XuShumei,ShanYehua.Basinassemblagesandtec tonicevolutionintheBohaiGulfanditsneighbours[J].ActaO ceanologicaSinica,2000,19(4):9199.
[6] 张善文,隋风贵,王永诗.济阳凹陷下第三系陡岸沉积模式[J].沉积学报,2001,19(2):219223.
[7] 赵徽林,刘孟慧.东濮凹陷下第三系砂体微相和成岩作用[M ].东营:华东石油学院出版社,1988.
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