Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 70-80.doi: 10.12108/yxyqc.20210208

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir characteristics and main controlling factors of Ordovician Yangshuiwu deep buried hill in Jizhong Depression

HUANG Yun1, YANG Dexiang1, LI Yubang1, HU Mingyi2, JI Hancheng3, FAN Jie1, ZHANG Xiaofang1, WANG Yuanjie1   

  1. 1. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    2. College of Earth Sciences, Yangtzi University, Wuhan 430100, China;
    3. College of Earth Sciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2020-07-25 Revised:2020-09-18 Online:2021-04-01 Published:2021-03-31

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Abstract: Strong reservoir heterogeneity and their unclear controlling factors are essential factors which restrict the exploration of Ordovician Yangshuiwu deep-buried hill. Based on core and thin-section observations and bulk XRD analysis,combined with scanning electron microscopy(SEM),physical properties,FMI and Sr isotope,the reservoir characteristics and their main controlling factors in the study area were analyzed. The results show that there are three sets of stratiform continuous reservoir and one set of locally discontinuous reservoir in vertically from the bottom to the top of the Ordovician buried hill. The first set of reservoir is mainly distributed in Liangjiashan Formation and the first members of Majiagou Formation,the second set of reservoir is distributed on the third members of Majiagou Formation to the top of the second member of Majiagou Formation,and the third set of reservoir is distributed on the fifth member of Majiagou Formation to the top of the forth member of Majiagou Formation. The sedimentary facies of the reservoirs is dominated by tidal flat facies,the lithology is mainly mudsilty dolomite,and the reservoir space consists of intercrystalline pores,intercrystalline dissolved pores,structural micro-fractures and expanded dissolved fractures. The porosity varies from 0.7% to 7.2% with an average of 3.26%,and the permeability ranges from 0.08 mD to 7.79 mD with an average of 1.49 mD,which suggests the reservoirs are characterized by extremely low porosity and extremely low permeability. The three sets of stratiform reservoir are controlled by dolomitization,karstification and tectonism. Dolomitization is the basic condition for reservoir formation,karstification is an important factor for reservoir improvement,and tectonism is a key factor for the formation of oil-bearing reservoirs. The first set of the reservoir is mainly controlled by interlayer karst and buried dolomitization,the second set of reservoir is mainly controlled by seep-reflux dolomitization and buried dolomitization, and the third set of reservoir is mainly controlled by seep-reflux dolomitization, meteoric water leaching and fractures. The third set and the first set of reservoirs are the most favorable reservoirs with deep dolomitization,large dolomite thickness,strong karst transformation and good physical properties,followed by the second set. Locally discontinuous reservoirs are related to tectonic activities,and mainly affected by faults, tectonic fractures and hydrothermal dolomitization.

Key words: carbonate rock, buried hill, influencing factors, Ordovician, Jizhong Depression, Bohai Bay Basin

CLC Number: 

  • TE112.3
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