泌阳凹陷下第三系构造特征与沉积体系

在深入研究泌阳凹陷大量岩心、测井和地震资料的基础上,证实泌阳凹陷具有独特的盆地结构样式和形成机制。南侧及东侧盆地主控断裂发育区为陡坡生长断裂型层序分布区，北侧为典型的缓坡型层序样式，相似于墨西哥湾生长断层层序地层模式。通过对层序体系域构成具有重要控制作用的独特的构造背景条件分析，建立了泌阳凹陷断陷湖盆层序地层模式，认为泌阳凹陷断陷湖盆完整的陆相层序体系域具有四分性:低水位体系域、水进体系域、高水位体系域及水退体系域。分析了主要含油层段下第三系核桃园组地层发育三种类型的三角洲沉积砂体：扇三角洲、近源三角洲和远源三角洲，并对其储集性能进行了分析比较。

The Structural Features and Depositional Systems of the Early Tertiary in the Biyang Depression

Detailed studies of a number of core sections, well logs and seismic data of the Biyang depression reveal that the depression had a special construction style and forming mechanism. In southern and eastern basin, where the main controlling faulting is apparent, steep slope growth break sequence dominates. The northern side of the basin belongs to a typical gentle slope sequence, resembling the grouth fault sequence model of the Gulf of Mexico. Through analyzing the particular structural background, which controlled predominantly the sequence system tracts, the pattern of strata sequence and deposition of the Biyang depression are established. The authors believe that the whole terrigenous sequence stratigraphy of the Biyang depression could be divided into four parts: lowstand systems tract, transgressive systems tract, highstand systems tract , and regressive systems tract. Three types of delta sandstones, fan-delta , near source delta and the far source delta, have been recognized in the primary oil bearing layers of the Early Tertiary Hetaoyang Formation. Their capibility to host petroleum is also discussed.