Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 35-45.doi: 10.12108/yxyqc.20190205

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Characteristics and controlling factors of high-quality reservoirs of the fourth member of Dengying Formation in northern Sichuan Basin

WANG Liangjun   

  1. Sinopec Exploration Company, Chengdu 610041, China
  • Received:2018-09-28 Revised:2019-01-04 Online:2019-03-21 Published:2019-03-21

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Abstract: To clear the characteristics and main controlling factors of Dengying Formation reservoir in northern Sichuan Basin,field outcrops and drilling core observation,rock thin-film identification,scanning electron microscopy,inclusion,cathodoluminescence,reservoir physical property testing were used to analyze the characteristics of petrology,reservoir space,diagenesis and physical properties,seismic data were used to recover the ancient geomorphology,and then the main controlling factors of the reservoir were discussed. The results show that the reservoir rocks are mainly composed of particle-bonded dolomite,algal stromatolitic dolomite and silty-fine dolomite. The reservoir space is dominated by algae-bonded lattice pores,intercrystalline dissolved pores and nearlayered dissolved pores. The reservoir generally has the characteristics of low porosity and low permeability,but high-quality reservoirs with medium pore and high permeability are developed in some areas. The platform marginal mounds and platform inner mounds facies controlled by paleo-geomorphic highlands on the edge of the rift trough are the basis for the development of high-quality reservoirs. Buried dissolution associated with thermal evolution of source rocks in the middle-deep burial stage is the key to controlling the development of a large number of dissolved pores in the fourth member of Dengying Formation. Whereas,the epigenetic karst has a weaker impact on the reservoir. High-quality reservoirs are developed in the western Yuanba to Langzhong block in the eastern margin of Mianyang-Changning rift trough,which is the superimposed favorable area for the marginal mounds facies and burial dissolution. It is a favorable gas exploration zone in northern Sichuan Basin.

Key words: dolomites, reservoir characteristics, controlling factors, Dengying Formation, northern Sichuan Basin

CLC Number: 

  • TE122.2
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