酒泉盆地营尔凹陷下白垩统层序地层划分及沉积体系特征
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摘要
以层序地层学为指导,以营尔凹陷地震、钻测井等资料为基础,结合酒泉盆地以往层序地层研究成果,通过对三级层序测井、录井特征分析和地震剖面上局部削截、上超等三级层序标志的识别,确定了层序边界,将下白垩统划分出1个Ⅰ级层序、3个Ⅱ级层序、7个Ⅲ级层序、18个体系域;在层序地层研究的基础上,总结出营尔凹陷下白垩统下沟组具有近物源、多物源、快速沉降、快速沉积的特点,凹陷缓坡发育大型扇三角洲,凹陷陡坡发育近岸水下扇,并指出南部陡坡一系列近岸水下扇应是下一步油气勘探的有利区带。
Guided by the methods of sequence stratigraphy and based on the seismic data,drilling and well logging data,other people's research on the sequence stratigraphy in Jiuquan basin,this paper analyzes the characteristics of the third-order sequence well logging,and recognizes the criterion of the third-order sequence boundary in seismic section,such as local truncation,onlap,and so on.From all this study above,the sequence boundary can be identified,and we recognize 1 first-order sequence,3 second-order sequences,7 third-order sequences and 18 system tracts.According to the sequence stratigraphy study,we conclude that the Xiagou Formation of the Lower Cretaceous in Yinger depression has the characteristics of near more provenances,rapid subsidence,and rapid deposition.The mild slope of the depression develops large scale fan deltas,and the steep slope develops nearshore subaqueous fans.Among these,the nearshore subaqueous fan in the south steep slope should be a favorable exploration target.
Guided by the methods of sequence stratigraphy and based on the seismic data,drilling and well logging data,other people's research on the sequence stratigraphy in Jiuquan basin,this paper analyzes the characteristics of the third-order sequence well logging,and recognizes the criterion of the third-order sequence boundary in seismic section,such as local truncation,onlap,and so on.From all this study above,the sequence boundary can be identified,and we recognize 1 first-order sequence,3 second-order sequences,7 third-order sequences and 18 system tracts.According to the sequence stratigraphy study,we conclude that the Xiagou Formation of the Lower Cretaceous in Yinger depression has the characteristics of near more provenances,rapid subsidence,and rapid deposition.The mild slope of the depression develops large scale fan deltas,and the steep slope develops nearshore subaqueous fans.Among these,the nearshore subaqueous fan in the south steep slope should be a favorable exploration target.
引文
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[8]潘良云,张宏伟,孙学栋,等.酒泉盆地营尔凹陷金佛寺逆冲推覆带速度分析及掩伏构造形态研究[J].石油地球物理勘探,2008,43(4):467-468.
[9]娄占伟,潘良云,张宏伟,等.甘肃酒泉盆地营尔凹陷层序地层特征与岩性勘探目标[J].现代地质,2005,19(4):564-569.
[10]王步清,陈汉林,杨树锋,等.酒泉盆地晚白垩世反转构造特征研究[J].天然气工业,2005,25(3):32-35.
[11]韩永科,胡英,王崇孝,等.酒泉盆地两个富油凹陷的区别与勘探潜力[J].新疆石油地质,2007,28(6):691.
[2]韩永科,刘永昌,岳智忠,等.酒泉盆地营尔凹陷长沙岭构造带油气勘探前景[J].新疆石油地质,2003,24(6):490-493.
[3]朱筱敏.层序地层学[M].东营:石油大学出版社,2000:172.
[4]王鸿祯,史晓颖.沉积层序及海平面旋回的分类级别:旋回周期的成因讨论[J].现代地质,1998,12(1):1-16.
[5]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):550-554.
[6]林畅松,刘景彦.高精度层序地层分析:建立沉积相和储层规模的等时地层格架[J].现代地质,2002,16(3):277-281.
[7]朱毅秀.酒东盆地营尔凹陷中下侏罗统和下白垩统砂岩储层的特征研究[J].电子显微学报,2006,25(增刊):309-310.
[8]潘良云,张宏伟,孙学栋,等.酒泉盆地营尔凹陷金佛寺逆冲推覆带速度分析及掩伏构造形态研究[J].石油地球物理勘探,2008,43(4):467-468.
[9]娄占伟,潘良云,张宏伟,等.甘肃酒泉盆地营尔凹陷层序地层特征与岩性勘探目标[J].现代地质,2005,19(4):564-569.
[10]王步清,陈汉林,杨树锋,等.酒泉盆地晚白垩世反转构造特征研究[J].天然气工业,2005,25(3):32-35.
[11]韩永科,胡英,王崇孝,等.酒泉盆地两个富油凹陷的区别与勘探潜力[J].新疆石油地质,2007,28(6):691.
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