Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (4): 81-87.doi: 10.3969/j.issn.1673-8926.2014.04.012

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Characteristics and controlling factors of low porosity and low permeability reservoir of the second member of Jialingjiang Formation in southern Sichuan Basin

YANG Zhe 1，2， ZHONG Dakang1，2， DU Benqiang3， L I Qirong3，ZHU Haihua1，2， ZHOU Yuzhe1，2
  

  1. 1. State Key Laboratory of Petroleum Resource and Prospecting， China University of Petroleum， Beijing 102249， China； 2. College of Geosciences， China University of Petroleum， Beijing 102249， China； 3. Shunan Gas District， Southwest Oil and Gas Field Company， PetroChina， Luzhou 646000， Sichuan， China
  • Online:2014-08-15 Published:2014-08-15

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Abstract:

Based on core observation, casting thin sections, physical properties and logging data, this paper studied the petrologic characteristics, diagenesis, reservoir space types, physical properties and controlling factors of the reservoir of the second member of Jialingjiang Formation in southern Sichuan Basin. The results show that high-quality reservoir is mainly developed in dolomite, especially in oolitic dolomite and micritic dolomite. The formation of oolitic dolomite is related to early dolomitization, and that of micritic dolomite is due to the dolomitization of micrite along with burial. Reservoir spaces of oolitic dolomite include intragranular dissolved pore, and the main pore types of micritic dolomite are dissolved pores and intracrystalline dissolved pores. The reservoir has the properties of low porosity and low permeability. Reservoir qualities are affected by palaeohigh, sedimentary facies and diagenesis. The restricted platform dolomite in the southeastern palaeohigh and grain beaches are favorable reservoirs.

Key words: naturalproductivity, controllingfactor, reservoir, ToutunheFormation, easternFukangslope, JunggarBasin

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