Oil & Gas Geology ›› 2017, Vol. 38 ›› Issue (6): 1123-1134.doi: 10.11743/ogg20170613

Previous Articles     Next Articles

Sequence stratigraphy and sedimentary evolution of Donghe Sandstone in Tarim Basin

Jia Dongli1, Tian Jingchun1, Zhang Xiang1, Zhu He2, Lin Xiaobing1, Su Bingrui1, Liang Qingshao1, Yu Hang1   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. Northwest Oilfield Branch, SINOPEC, Urumqi, Xinjiang 830011, China
  • Received:2017-09-19 Revised:2017-10-26 Online:2017-12-28 Published:2018-01-08

Abstract: The Donghe Sandstone is constituted of the Donghetang Formation from the Upper Devonian and the Bachu Formation from the Lower Carboniferous.A basin-wide tracing and correlation of the sandstone combined with a fine study of its sedimentary evolution is currently a major task for further oil and gas exploration in the basin.Guided by sequence stratigraphy theories,we analyzed in detail the sequence stratigraphy and sedimentary evolution of the sandstone based on a wealth of data,including drilling data,mud and wire logging data,cores and seismic data.Two types of sequence boundaries together with two second-order sequences and six third-order sequences (SQ1-SQ6) were recognized in the sandstone and a basin-wide sequence stratigraphy framework was also built.The result showed great influence of palaeogeomorphology upon the distribution of the sequences and an almost intact SQ4 to SQ6 in the whole basin.Within the sequence stratigraphy framework,there were five sedimentary facies,such as delta facies,longshore facies and etc..A study of plane sedimentary evolution of the sedimentary facies showed that during the deposition of SQ1 to SQ6,the deposition area of the sandstone had gradually enlarged,with favorable conditions for the development of potential lithologic traps in SQ4 sandbody of Shunnan area,in SQ5 sandbody of Shunxi area and in SQ6 sandbody of Shuntuo area.Further exploration shall be focus on these sandbodies.

Key words: sedimentary evolution, sequence stratigraphy, Donghe Sandstone, Tarim Basin

CLC Number: