大王北洼陷浅水漫湖砂质滩坝沉积微相特征
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摘要
通过岩心精细的观察,结合测井、三维地震以及岩石鉴定分析等资料的综合研究发现,大王北洼陷沙二段盆地断坳期为浅水漫湖砂质滩坝沉积,可分为:滩、坝主体、坝侧缘、坝间4种沉积微相,其中坝主体的成分成熟度和结构成熟度较高,且坝主体砂层最厚,滩、坝侧缘和坝间砂体次之。另外,沙二段时期盆地内河流三角洲不发育,大量坝砂呈条带状沿岸或斜交岸线发育,滩砂呈席状大面积覆盖于盆内与坝砂和其他沉积砂体相连,构成了洼陷"满盆砂"的浅水漫湖沉积的特征。这些砂体规律性地分布于洼陷内,并且与油源邻近(沙三段中部油页岩),是有利的油气储集体,与油气富集密切相关。
The careful observations of core data,logging and 3D-seismic and petrographic analysis reveal that the 2nd member of the Shahejie Formation in the Dawangbei Sag consists of sandy beach and bar of shallow water over-lake.The sandy beach and bar of shallow water over-lake can be divided into four microfacies:beach,key bar,side-portion of bar and between-portion of bar.Among them,the key bar has a very high textural maturity and compositional maturity and a little thicker than beach,side-portion of bar and between-portion of bar.The 2nd member of the Shahejie Formation in Dawangbei Sag contains less developed delta,and well developed long and oblique bars preading across the lake shore.The beach sandy body overlapped in the sag,connecting the bar and other sandy bodies.These sandy bodies are developed in the whole shallow water over-lake in Dawangbei Sag,distributed in regualrity next to the hydrocarbon source(oil shale in the middle of the 3rd member of the Shahejie Formation).They form an important reservoir rock and a potential for the exploration of oil and gas.
The careful observations of core data,logging and 3D-seismic and petrographic analysis reveal that the 2nd member of the Shahejie Formation in the Dawangbei Sag consists of sandy beach and bar of shallow water over-lake.The sandy beach and bar of shallow water over-lake can be divided into four microfacies:beach,key bar,side-portion of bar and between-portion of bar.Among them,the key bar has a very high textural maturity and compositional maturity and a little thicker than beach,side-portion of bar and between-portion of bar.The 2nd member of the Shahejie Formation in Dawangbei Sag contains less developed delta,and well developed long and oblique bars preading across the lake shore.The beach sandy body overlapped in the sag,connecting the bar and other sandy bodies.These sandy bodies are developed in the whole shallow water over-lake in Dawangbei Sag,distributed in regualrity next to the hydrocarbon source(oil shale in the middle of the 3rd member of the Shahejie Formation).They form an important reservoir rock and a potential for the exploration of oil and gas.
引文
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[3]刘军锷,刘广春,李秀华,等.东营凹陷南坡沙四段滩坝砂体与成藏条件分析[C]∥佚名.胜利油区勘探开发论文集:3.北京:地质出版社,2001:64-70.
[4]孙锡年,刘渝,满燕.东营凹陷西部沙四段滩坝砂岩油气成藏条件[J].国外油田工程,2003,19(7):24-25.
[5]刘伟,吕优良,徐徽,等.东营凹陷南斜坡东段沙四上亚段沉积相与砂体展布研究[J].江汉石油学院学报,2004,26(2):23-26.
[6]蒋解梅,王新征,李继山,等.东营凹陷沙四段滩坝砂微相划分与砂体横向预测——以王家岗油田王73井区为例[J].石油地质与工程,2007,21(4):12-16.
[7]Selley R C.Applied sedimentology[M].London:AcademicPress,1988:205-212.
[8]袁静.济阳坳陷南部古近系洪水—漫湖沉积[J].中国地质,2005,132(4):655-661.
[9]杨西燕,沈昭国,方少仙,等.鄂尔多斯盆地乌审旗气田中二叠统下石盒子组盒8段下亚段滩坝砂体沉积特征[J].古地理学报,2007,9(2):175-183.
[10]张本琪.车镇凹陷层序地层与石油地质[M].北京:石油工业出版社,2004:33-37.
[11]袁静.惠民凹陷古近系风暴沉积研究[J].中国石油大学学报:自然科学版,2006,30(4):1-6.
[12]Diem B.Analytical method for estimating palaeowave climateand water depth from wave ripple marks[J].Sedimentology,1985,32:705-720.
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