论文部分内容阅读
开鲁盆地陆西凹陷是一个典型的中生代单断箕状盆地 ,充填了厚达 30 0 0余米的下白垩统并表现出良好的沉积旋回特征。依据钻井取心资料、测井和地震资料以及分析化验资料 ,将下白垩统划分成周期为 4～ 6Ma的 3个沉积层序并总结了层序边界和体系域边界的识别标志。考虑箕状盆地结构、构造活动特征以及沉积物供源方式 ,分别论述了盆地陡坡、深洼和缓坡的层序地层样式 ,止出不同地形区的层序地层叠置样式主控因素是有差异的。依据盆地缓坡地形变化带 ,可以将一个沉积层序细分成低位、湖侵和高位体系域。研究区层序Ⅲ高位和低位体系域富含油气资源 ,是今后寻找隐蔽圈闭的主要层段
The Luxi Sag in the Kailu Basin is a typical Mesozoic single-graben basin filled with a Lower Cretaceous with a thickness of 300 meters and showing a favorable sedimentary cycle. According to the drilling coring data, logging and seismic data and laboratory data, the Lower Cretaceous is divided into three sedimentary sequences with period of 4 ~ 6Ma, and the identification marks of sequence boundary and system boundary are summarized. Considering the structure of Kei Basin, the tectonic activities and the source of sediment, the stratigraphic patterns of steep slopes, deep depressions and gentle slopes of the basin are discussed respectively. The main controlling factors of sequence stratigraphic superimposition pattern in different terrain areas are different of. Based on the gentle slope topography of the basin, a sedimentary sequence can be subdivided into low-lying, lake-penetrating and highstandard systems. The high and lowstands of the sequence Ⅲ of the study area are rich in oil and gas resources and are the main sections for finding hidden traps in the future