东营凹陷沙河街组三段—二段下亚段沉积层序及成因
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摘要
根据地震、岩性及电性等特征 ,东营凹陷沙河街组三段—二段下亚段可划分为 3个三级层序。底部层序(SSⅠ )相当于沙河街组三段下亚段 ,低位体系域不发育 ,只发育湖侵体系域和高水位体系域 ,受早期构造沉降和气候控制。中部层序 (SSⅡ )代表的是沙河街组三段中亚段沉积 ,与底部层序具有类似特征。SSⅠ,SSⅡ均为T -R旋回的沉积。顶部层序 (SSⅢ)代表沙河街组三段上亚段 -二段下亚段沉积 ,发育低水位体系域、水侵体系域和高水位体系域 ,是一完整的旋回。SSⅢ是在构造活动相对较弱 ,气候相对干旱、水体供应不足的条件下形成的
Member Ⅲ-lower submember of Member Ⅱ in Shahejie Formation of Dongying Depression can be divided into Ⅲ third-order sequences on the basis of seismic data,lithology and electric characteristics etc.The bottom of sequence(SSI) corresponds to the lower submember of Member Ⅲ of Shahejie Formation,characterized by lowstand system tracts undeveloped,only lacustrine transgression system tracts and highstand system tracts developed,all of theses are controlled by the early tectonic subsidence and climate.Middle sequence(SSⅡ) represents the mid-submember sedimentation of Member Ⅲ in Shahejie Formation and has similar nature of the bottom sequence.SSI and SSⅡ are all T-R cyclic sedimentation.Top sequence (SSⅢ) representing sedimentation of the upper submember of Member Ⅲ-lower submember of Member Ⅱ in Shahejie Formation (forming Lowstand system tracts,water transgression system tracts and highstand system tracts) is a complete cycle.SSⅡ was formed under the conditions of tectonic activity relatively weak,climate relatively dry and water supply insufficiently.
Member Ⅲ-lower submember of Member Ⅱ in Shahejie Formation of Dongying Depression can be divided into Ⅲ third-order sequences on the basis of seismic data,lithology and electric characteristics etc.The bottom of sequence(SSI) corresponds to the lower submember of Member Ⅲ of Shahejie Formation,characterized by lowstand system tracts undeveloped,only lacustrine transgression system tracts and highstand system tracts developed,all of theses are controlled by the early tectonic subsidence and climate.Middle sequence(SSⅡ) represents the mid-submember sedimentation of Member Ⅲ in Shahejie Formation and has similar nature of the bottom sequence.SSI and SSⅡ are all T-R cyclic sedimentation.Top sequence (SSⅢ) representing sedimentation of the upper submember of Member Ⅲ-lower submember of Member Ⅱ in Shahejie Formation (forming Lowstand system tracts,water transgression system tracts and highstand system tracts) is a complete cycle.SSⅡ was formed under the conditions of tectonic activity relatively weak,climate relatively dry and water supply insufficiently.
引文
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2 郭建华,宫少波,吴东胜陆相断陷湖?鑄-R旋回沉积层序与研究实例[J]沉积学报,1998,16(1):8～15
3 纪友亮,张士奇,冷胜荣,等层序地层学原理及层序成因机制模式[M]北京:地质出版社,1998
4 张振生,黎英,王冰冀中坳陷陆相地层层序地层学的应用[J]石油学报,1997,18(2):26～34
5 陈文学,姜在兴,鲜本忠,等层序地层学与隐蔽圈闭预测———以河南泌阳凹陷为例[M]北京:石油工业出版社,2001
6 范代读,邱桂强,李从先,等东营三角洲的古流向研究[J]石油学报,2001,20(1):29～35
7 兰恒星,李增学,魏久传山东黄县早第三纪断陷盆地充填演化动力学特征[J]煤田地质与勘探,2000,28(2):6～11
8 邬金华,张哲,王柏轩内陆凹陷层序地层的关键界面及其有关问题———以东营凹陷沙二段和沙三上亚段为例[J]地层学杂志,2000,24(1):78～84
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