|Table of Contents|

Modern Sedimentary Characteristics and Sedimentary Evolution of Barrier-type Coast in Yudai Beach of Hainan, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第03期
Page:
653-662
Research Field:
沉积地质与油气勘探
Publishing date:

Info

Title:
Modern Sedimentary Characteristics and Sedimentary Evolution of Barrier-type Coast in Yudai Beach of Hainan, China
Author(s):
TANG Ming-yuan1;  LEI Tao1;  GAO Qing-song1;  CHEN Kui1;  REN Guang-lei1;  LIU Lin-song1;  ZHAO Yong-gang2*
(1. Exploration & Development Research Institute, North China Oil and Gas Company, SINOPEC, Zhengzhou 450006, Henan, China; 2. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China)
Keywords:
sedimentology;  barrier island;  lagoon;  estuary sandbar;  alluvial island;  tidal channel;  evolution;  Hainan
PACS:
P931; P531
DOI:
10.19814/j.jese.2022.11019
Abstract:
Yudai beach in Hainan is one of the typical modern barrier-type coast sedimentary sites along the South China Sea coast. According to the field investigation and laboratory research, the modern sedimentary characteristics of barrier-type coast of Yudai beach were revealed from the the composition, structure and sedimentary structure of the sediments. The results show that the east side of Yudai beach is the barrier island beach, and on the whole, the grain size of sedimentary sequence becomes coarser from bottom to top; the middle part is the barrier island sand dunes, mainly with medium and coarse grained quartz sand, parallel bedding and oblique bedding; the west side is the barrier flat, the sediment is mainly medium and fine sand with some shell fragments, and the bedding structure is obvious. The waters on the west side of Yudai beach are lagoons with stronger river action than tidal action. The main reason for the distribution of alluvial islands in lagoons is the development of estuary sandbar or river branch generated by the obstruction of river rock islands. Only the estuary sandbar accumulation occurs outside the tidal channel. According to modern sedimentary characteristics and the satellite remote sensing images of Google Earth, the barrier-type coastal sedimentary evolution includes three stages: ① The river carries sediment into the sea, forming a multi-stage approximate crescent estuary sandbar in the estuary region. ② Due to the continuous changes in the extension direction of the waterway and hydrodynamic force in the later period, the sandbars in the western estuary are merged and transformed into alluvial islands; at the turning area of the coast, the original estuary sandbars are taken as the main body to form the initial barrier sandbars, and the water on the west side of the barrier sandbars evolve into lagoons. ③ The west side of barrier island is affected by river scouring, and the head of estuary sandbar almost completely disappears; after the barrier island sandbar formed, the lagoon water surface widens, the flow velocity decreases, and the estuary sandbar proliferates and merges, and finally three major alluvial islands(Shapo island, Dongyu island and Yuanyang island)are formed. The barrier-type coast modern sedimentation is a barrier island-lagoon sedimentary system with alluvial island, which is different from the traditional clastic coastal barrier island-lagoon sedimentary system. Study on the sedimentary characteristics and evolution has provided a valuable sedimentary evolution model for further understanding and predicting the oil and gas reservoirs of the ancient clastic coastal barrier island-lagoon sedimentary system.

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Last Update: 2023-05-30