南襄盆地泌阳断陷高分辨率层序地层研究

Application of High-Resolution Sequence Stratigraphy in Biyang Fault Depression of Nanxiang Basin.

根据陆相层序在地震剖面及电测曲线上的识别标志,采用沉积旋回分析技术及Fischer图解法,将泌阳断陷双河-赵凹地区下第三系核三上段划分为三个陆相层序,在研究区表现为冲积扇-扇三角洲-湖相沉积体系空间配置关系。在这三个陆相层序中发育低位加积型、退积型、高位加积型和进积型4类小层序组共13个,其中可识别的小层序达40余个,并进一步阐明了其沉积相(微相)构型特征。

According to recognition marker of terrigenous sequence on seismic profiles and well logs,using the methods of sedimentary cyclic analysis and Fischer diagram,the upper member of Eh 3 of Shuanghe-Zhao'ao are in Biyang fault-depression can be classified into three terrigenous sequences.In Shuanghe-Zhao'ao area there lies fluvial fan-fan delta-lacustrine depositional system in sequence.In the three terrigenous sequences thirteen parasequence sets which include four basic types,i.e.,lowstand aggradation,regression,highstand aggradation and progradation have been developed,of which there are approxmately40recognizable parasequences.And the characteristics of sedimentary fa-cies(microfacies)have been further expounded in this paper.