Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (6): 808-815.doi: 10.11743/ogg20050621

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Sedimentary facies and sequence stratigraphy of Donghe Sandstone in Akekule Uplift

Guo Jianhua1, Zhu Meiheng1, Liu Chensheng1, Shi Yuanyuan2   

  1. 1. South-Central University, Changsha, Hunan;
    2. Petroleum Exploration and Development Research Institute, Northwest Branch Company, SINOPEC, Urumqi, Xinjiang
  • Received:2005-09-14 Online:2005-12-25 Published:2012-01-16

Abstract:

Donghe sandstone in Akekule,composed of mud-pebbly sandstone,well sorted(medium-to)fine-grained sandstones,siltstone and mudstone,is a normal sequence with a complete transgressive-regressive cycle,the top and bottom of which are defined by unconformities,i.e.,type Ⅰsequence boundaries.Donghe sandstone can evidently be divided,from bottom to top,into lowstand system tract,transgressive system tract and highstand system tract.As the lowstand system tract is subaerial fluvial deposit,it is underdeveloped in the basin with limited distribution.The transgressive system tract is mainly composed of shore deposit controlled by tide.A series of shallowing and fining upward parasequences constitute the retrograding parasequence group.The parasequences gradually change upward from subtidal sandbar in the lower part to intertidal sand flat,mixed sand and mud flat,and mud flat.The highstand system tract is mainly distributed in the upper Donghe sandstone.Duing the continuous deposition of Donghe sandstone, the inshore sea water circulated smoothly and(unimpededly)after the largest marine flooding surface was reached,leading to the formation of wave-controlled shore deposition system with wave action as the main geologic agent,which is mainly characterized by grayish white(medium-to)fine-grained sandstone. They constitute the characteristic "Donghe sandstone".

Key words: sedimentary facies, tide-controlled shore, wave controlled shore, sequence stratigraphy, Donghe sandstone, Tarim basin

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