Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 80-91.doi: 10.12108/yxyqc.20180310

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Genetic types, configurations and distribution of sand bodies of Shanxi Formation in northeastern Ordos Basin

WANG Yue, GUO Yanru, ZHANG Yanling, LIU Junbang, TIAN Mingwei   

  1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2017-10-20 Revised:2017-12-15 Online:2018-05-21 Published:2018-05-21

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Abstract: During the sedimentary period of Shanxi Formation in Ordos Basin,terrestrial plants flourished, which provides sufficient gas source for the formation of natural gas. The accumulation of oil and gas is controlled by lithology and lithofacies. Therefore,it is necessary to study the configuration and distribution of sand bodies of Shanxi Formation. In order to speed up the exploration of natural gas,guided by the basic principles of sequence stratigraphy and sedimentology,through comprehensive analysis of outcrop section,drilling and well logging data,the configuration and distribution characteristics of different genetic types of sand bodies under the fourth-order sequence framework of Shanxi Formation were emphatically studied. The result shows that the Shanxi Formation in the study area can be divided into five fourth-order sequences. The sand bodies are dominated by distributary channel sand bodies of braided-delta plain and the underwater distributary channel sand bodies of braided-delta front. The plane distribution of channel sand bodies is characterized by north-south zonation and east-west penetration. The superimposed modes of sand bodies are mainly three types:vertical overlap,vertical tangency and independent type. The fourth-order sequences including PSQ31 (equal to the Shan 23 section and the lower part of the Shan 22 section),PSQ32 (equal to the upper part of the Shan 22 section)and PSQ4 (1 equal to the Shan 12 section)are the main layers of natural gas exploration. Dabaodang, Yuxing Zhuang, Longzhen were selected as favorable exploration areas. The method and results could provide reference for the sequence stratigraphic division, sand body distribution law research and favorable zone optimization for the study area and similar areas.

CLC Number: 

  • TE121.3
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