Natural Gas Geoscience ›› 2019, Vol. 30 ›› Issue (9): 1263-1271.doi: 10.11764/j.issn.1672-1926.2019.06.005

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Palaeogeomorphological restoration of Ordovician subsalt and its controlling effect on beach bodies, eastern Ordos Basin

Chun-lin Zhang1,2(),Jian Li1,2,Xin Chen3,Qing-chao Wu4   

  1. 1. Institute of Natural Gas Geology, PetroChina Research Institute of Petroleum Exploration and Development, Langfang 065007, China
    2. Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, China
    3. College of Geosciences, China University of Petroleum, Beijing 102249, China
    4. No. 1 Oil Production Plant of Daqing Oil Field Company, Daqing 163000, China
  • Received:2019-02-15 Revised:2019-06-12 Online:2019-09-10 Published:2019-10-14

Abstract:

Palaeogeomorphology is an important factor controlling the development of Ordovician Subsalt beach in the eastern Ordos Basin. It has important exploration significance to study the development zone of beach body. Based on the combination of impression and sedimentological analysis method, the palaeogeomorphological characteristics of Pre-Mawu5 deposition were restored through the steps of residual thickness calculation, compaction recovery and sedimentary microfacies correction in the eastern Ordos Basin. According to the above analysis, the controlling effect of palaeogeomorphology on the beach body was studied. The palaeogeomorphological characteristics of the study are generally high in the northwest, low in the southeast and micro-palaeogeomorphological sedimentary pattern with uplift and depression in the interior. Core observation and slice-identifying indicate that the intraclast beach of Mawu6 was formed in the high part of palaeogeomorphology in the interior of carbonate platform, while the gypsum-salt rock was developed in the low-lying part of palaeogeomorphology in the interior of carbonate platform.

Key words: Ordos Basin, Ordovician, Palaeogeomorphology, Subsalt, Beach body

CLC Number: 

  • TE121

Fig.1

Location map of research area and tectonic zoning map in Ordos Basin"

Fig.2

Stratigraphic column of Ordovician in eastern Ordos Basin"

Fig.3

Stratigraphic thickness map before and after compaction of Mawu5 in eastern Ordos Basin"

Fig.4

Presedimentary paleogeomorphologic map of Mawu5 by restoration of impression method"

Fig.5

Sedimentary facies map of Mawu5 in eastern Ordos Basin"

Fig.6

Extraction of sedimentary microfacies characteristic points"

Fig.7

Palaeogeomorphology before Mawu5 deposition in eastern Ordos Basin"

Fig.8

Typical characteristics of inner clastic beach"

Fig.9

Sedimentary facies map of Mawu6 in eastern Ordos Basin"

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