Petroleum Exploration and Development >

2021 , Vol. 48 >Issue 1: 123 - 135

DOI: https://doi.org/10.1016/S1876-3804(21)60009-5

Distribution of shallow water delta sand bodies and the genesis of thick layer sand bodies of the Triassic Yanchang Formation, Longdong Area, Ordos Basin

  • Hanlin LIU ,
  • Zhen QIU ,
  • Liming XU ,
  • Fengqin WANG ,
  • Qiang TONG ,
  • Jiahao LIN ,
  • Shuai YIN ,
  • Wenqiang WANG
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  • 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
    2. School of Earth and Space Sciences, Peking University, Beijing 100871, China
    3. PetroChina Changqing Oilfield Company, Xi’an 710021, China
    4. College of Geosciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
    5. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China
    6. No.3 Gas Production Plant, PetroChina Changqing Oilfield Company, Wushenqi 017300, China
    7. State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China

Received date: 2020-05-06

  Revised date: 2021-01-06

  Online published: 2021-02-07

Supported by

National Basic Research Program of China (973 Program)(2014CB239000);China Petroleum Scientific Research and Technology Development Project(YJXK2019-16)

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Abstract

Based on the cores from 47 wells and logging data of 130 wells, the main types of sand bodies in the shallow water delta of the Chang 82 sub-member in the Triassic Yanchang Formation, Longdong Area, Ordos Basin were comprehensively analyzed, the distribution characteristics of sand bodies more than 20 m thick were identified, and the genetic types of the thick sand bodies were sorted out. In this region, thick-bed sand bodies can be divided into two types according to the shape and position: type 1 is the sand body in wide strip and is distributed between the average high water mark and the average low water mark; type 2 is distributed on both sides of the average low water mark and is in irregular lump shape. Based on the principle of the volume distribution of sediments and the change rule of accommodation space, the genetic models of two types of thick-bed sand bodies in the Chang 82 sub-member are superimposed distributary channel sand bodies in high accommodation space and superimposed composite sand bodies in low accommodation space.

Key words： Ordos Basin; Longdong area; shallow delta; sand body distribution; sand body genetic type; Triassic Yanchang Formation; Chang 82 sub-member

Cite this article

Hanlin LIU , Zhen QIU , Liming XU , Fengqin WANG , Qiang TONG , Jiahao LIN , Shuai YIN , Wenqiang WANG . Distribution of shallow water delta sand bodies and the genesis of thick layer sand bodies of the Triassic Yanchang Formation, Longdong Area, Ordos Basin[J]. Petroleum Exploration and Development, 2021 , 48(1) : 123 -135 . DOI: 10.1016/S1876-3804(21)60009-5

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