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Characteristics and formation conditions of carbonate reservoir in Leikoupo Formation of western Sichuan Basin

Tian Han，Tang Song，Zhang Jian-yong，Xin Yong-guang，Wang Xin，Li Wen-zheng   

  1. 1.PetroChina Hangzhou Research Institute of Geology，Hangzhou 310023，China； 2.Research Institute of Sichuan Basin，PetroChina Research Institute of Petroleum Exploration &Development，Chengdu 610041， China； 3.Central Sichuan Oil and Gas Mine，PetroChina Southwest Oil and Gas Field Company，Suining 629001，China
  • Received:2018-03-23 Revised:2018-09-10 Online:2018-11-10

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Abstract: In recent years，there are many oil and gas discoveries in Triassic Leikoupo Formation in western Sichuan Basin，but the comprehensive studies on the characteristics of carbonate reservoir and the controlling factors are weak，which has seriously restricted the oil and gas exploration and development.Based on field outcrop，core observations，rock sections，logging data and the experiment data，systematic summarizationof the characteristics and formation conditions of carbonate reservoir in Leikoupo Formation in western Sichuan Basin，it is concluded that:(1)the main types of reservoir rock in Leikoupo Formation are algal dolomite，grainstone dolomite and crystal dolostones，and the main pore space are intergranular pore，intercrystal pore and biological framework pore.The characteristics of reservoir are low porosity and low permeability.(2)The reservoir developments in Leikoupo Formation in western Sichuan Basin are controlled by sedimentary microfacies and karstification.The sedimentary microfacies provide the material foundation for the development of the reservoir.The dolomitization and karst effect in Penecontemporaneous period are the key factors to form and maintain pore space.The late hypergenensis at the end of middle Triassic can strengthen and consolidate the pore space.The dissolution of organic acid and the residual oil and gas play an active protective role.

Key words: Leikoupo Formation, Carbonate rock, Reservoir types, Reservoir characteristics, Controlling factors

CLC Number: 

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