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Marine Origin Petroleum Geology >

2025 , Vol. 30 >Issue 2: 119 - 132

DOI: https://doi.org/10.3969/j.issn.1672-9854.2025.02.003

Lithofacies paleogeographic characteristics of Cambrian sequence and their control over reservoir in Ordos Basin

  • LU Yi , 1, 2 ,
  • ZHANG Chunlin , 2 ,
  • YOU Xuelian 1 ,
  • NIE Yuhan 3
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  • 1. China University of Geosciences (Beijing)
  • 2. PetroChina Research Institute of Petroleum Exploration and Development
  • 3. The Fourth Oil Production Plant of PetroChina North China Oilfield Company
ZHANG Chunlin, PhD, Senior Engineer, engaged in sedimentology and reservoir geology and evaluation of oil and gas exploration targets. Add: No.20 Xueyuan Rd., Haidian District, Beijing 100083, China. E-mail:

LU Yi, MSc, engaged in geological research. Add: No. 29 Xueyuan Rd., Haidian District, Beijing 100083,China. E-mail:

Received date: 2024-08-28

  Revised date: 2024-10-12

  Online published: 2025-05-13

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Abstract

The Cambrian in Ordos Basin has the potential for natural gas exploration. To clarify the distribution pattern of favorable sedimentary facies zones and reservoirs，by comprehensively analysing core, outcrop and seismic data，two types of sequence boundaries, unconformities and lithological transition surfaces are have been identified in the Cambrian of the Ordos Basin.The Cambrian strata can be divided into two 2nd-order sequences (SS1, SS2) and eight 3rd-order sequences (SQ1-SQ8), each 3rd-order sequence consists of a TST and a HST, lacking a LST. The unconformity surfaces of the bottom and top of the Cambrian system serve as the bottom and top boundaries of SS1 and SS2. The lithological transition surface is the 3rd-order sequence boundary. Eight lithofacies palaeogeoguaphic maps were systematically compiled to analyze the lithofacies paleogeographic distribution characteristics under 3rd-order sequence stratigraphic framework of Cambrian in Ordos Basin. The Cambrian in the Ordos Basin has gone through two sedimentary stages. SQ1-SQ4 is the stage of transgression, developing carbonate ramp sedimentary system. SQ5-SQ8 is the stage of regression, developing shallow water carbonate platform sedimentary system. Controlled by the evolution of sequence lithofacies paleogeography, the Cambrian reservoirs in Ordos Basin are mainly distributed longitudinally in SQ6-SQ8, and the good reservoirs of Cambrian in Ordos Basin include three types: dolomitizational oolitic shoal reservoir, supergene karst reservoir and fault-dissolution reservoir. Due to the control of the platform margin and high-level system tract, as well as the distribution and faulting of ancient uplifts, the oolitic shoal reservoir is mainly distributed in the western and southern platform margin of the basin, the supergene karst reservoir is distributed in the periphery of the palaeouplift, and the fault-dissolution reservoir is isolated in the basin.

Key words： sequence; lithofacies palaeogeography; sedimentary system; reservoir; Cambrian; Ordos Basin

Cite this article

LU Yi , ZHANG Chunlin , YOU Xuelian , NIE Yuhan . Lithofacies paleogeographic characteristics of Cambrian sequence and their control over reservoir in Ordos Basin[J]. Marine Origin Petroleum Geology, 2025 , 30(2) : 119 -132 . DOI: 10.3969/j.issn.1672-9854.2025.02.003

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