浙江省栖霞组沉积微相、韵律、沉积旋回及层序地层学分析

DEPOSITIONAL MICROFACTES, RHYTHMS, CYCLES AND SEQUENCE STRATIGRAPHY OF QIXIA FORMATION IN ZHEJIANG PROVINCE, CHINA

何海清

He Haiqing

中国石油天然气总公司石油勘探开发科学研究院, 北京, 100083

Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083

本文以沉积微相及生物生态分析为基础,对研究区3条剖面栖霞组的沉积韵律、沉积旋回、沉积环境进行了研究,并在此基础上分析了层序界面、沉积层序及各沉积体系域的沉积特征。认为研究区栖霞组总体形成于潮下低能开阔无障壁的碳酸盐级坡沉积背景,其中可识别出两类界面,4个沉积层序,根据界面特征及准层序叠加型式划分出海度体系域(TST)和高水位体系域(HST)。

Based on the sedimentary microfacies and bioecologic analysis for the Qixia Formation of three sections in studied area, this paper summaried the depositional rhythms, cycles and sedimentary environment of Qixia Formation, and further analysed the characteristics of sequence boundary and depositional system tract. The results suggest that Qixia Formation in the study area was on the whole formed in a depositional setting of carbonate gradual slope that was subtidal, low-energied, open and non-barrier; and moreover two kinds of sequence boundaries and four sequences are recognized in Qixia Formation. According to the characteristics of sequence boundary and the stacking type of parasequences, it is divided into a transgressive system tract (TST) and a highstand system tract (HST).

https://doi.org/10.11781/sysydz199702127