LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 149-154.doi: 10.3969/j.issn.1673-8926.2015.05.024

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Sedimentary genesis of sand-conglomerate reservoir and its control effect on reservoir properties: A case study of the lower Urho Formation in Ma 2 well block of Mahu Depression

Pang Dexin   

  1.  Low Efficient Oilfield Development Company , PetroChina Xinjiang Oilfield Company , Karamay 834000 , Xinjiang , China
  • Online:2015-09-26 Published:2015-09-26

Abstract:

According to core observation, well logging, logging, casting thin sections and analysis assay data, this paper studied the sand-conglomerate reservoir characteristics of the lower Urho Formation in Ma 2 well block of Mahu Depression. The reservoir lithology could be divided into sand-conglomerate, conglomeratic sandstone, sandstone and shaly sandstones and so on. The sand-conglomerate could be further divided into traction current sand-conglomerate and gravity current sand-conglomerate by the genesis, and they have many obvious differences on the aspects of maturity, muddy matrix content, pore type and so on, which causes the huge differences of reservoir properties. The pore type of sand-conglomerate reservoir mainly is secondary porosity, belonging to low porosity and low permeability reservoir. Sedimentary environment(microfacies) has very obvious control effect on sand-conglomerate reservoir properties, among them, traction current sand-conglomerate of underwater distributary channel microfacies has the best reservoir properties, followed by stream channel microfacies, and the gravity current sand-conglomerate of debris flow and underwater debris flow microfacies has the poorest reservoir properties, which can form property interbeds.

Key words: siliceous rock, geochemical characteristics, genesis, Palaeozoic, Lower Yangtze area

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