西南石油大学学报(自然科学版)

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Reservoir Characteristics and Controlling Factors of Da’anzhai
Member in Lower Jurassic,Central Sichuan

Chen Wei1, Hao Yi1, Ni Chao1, Zhu Yin1,2, Hou Gangfu1   

  1. 1. Hangzhou Institute of Geology,PetroChina,Hangzhou,Zhejiang 310023,China
    2. Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou,Zhejiang 310023,China
  • Online:2013-10-20 Published:2013-10-20

Abstract:

Based on the lithology characteristics of the drill cores,outcrops profile,and thin slice observation,X-diffraction,
isotopic analysis,CT-Scanning,and so on in the central of Sichuan Basin,we studied the reservoir of Da’anzhai Member
in lower Jurassic in the paper. The Da’anzhai Member could be divided into two main kinds of reservoir:crystallized shelly
limestone and argillaceous-organic shelly limestone. The main storage spaces include emposieu,intercrystalline gap,intra-shell
dissolved pore,periphery gap,inter-shell gap,shelly microfracture,interlamination fracture,tectonic fracture and so on. The
reservoir was controlled by sedimentary facies,diagenesis,denudation,tectonic disruption and so forth. Sedimentary facies
is the environment basements of reservoir;denudation and tectonic disruption are the key factors that the reservoir could be
improved;some diagenesis such as compaction,pressolution,cementation and metasomasis are disadvantages for the reservoir.

Key words: central Sichuan;lower Jurassic;Da&rsquo, anzhai Member;reservoir characteristics;controlling factors