Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (3): 413-421.doi: 10.11743/ogg20060318

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Carbonate reservoirs prediction with sequence stratigraphy:application in Shiwandashan area

Li Guorong1, Wang Xin1, Zhou Xinhuai2, Qiao Zhanfeng1, Zeng Yunfu1   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059;
    2. Tianjin Division Company, CNOOC, Tianjin 300452
  • Received:2006-04-30 Online:2006-06-25 Published:2012-01-16

Abstract:

Carbonate reservoirs can be divided into intra-sequence reservoirs and sequence boundary reservoirs based on study of sequence stratigraphy.First of all,the development potentials of the two types of reservoirs mentioned above are defined according to the growth rate of carbonates,then the distribution of intra-sequence reservoirs is predicted through detailed delineation of the distribution of isochronous unit reef flat facies;and the development of sequence boundary reservoirs is predicted on the basis of analysis of the types and natures of sequence unconformity surfaces.The Devonian in Shiwandashan area is a "progradational wedge" platform with low growth rate of carbonates,and is dominated by reservoirs controlled by "type-Ⅰsequence unconformity interface";as a whole,the reservoirs are well developed.The Carboniferous is an "aggradational" platform in epicontinental sea with low growth rate of carbonates,and is dominated by sequence boundary reservoirs under the control of the fourth-order and third-order sequence boundaries;the reservoirs are poorly developed.Both the intra-sequence reservoirs and the sequence boundary reservoirs under the control of third-order sequence boundary in the Lower Permian are poorly developed;only the scattered point reef reservoirs developed to the north of Pingxiang-Dongmen fault and the karstic,fractured and vuggy reservoirs controlled by the sequence boundary formed during Dongwu tectonic movement are worthy to be considered.Neither the intra-sequence re-(servoirs) nor the sequence boundary reservoirs are developed in the Upper Permian carbonates.As for the Lower Triassic,both intra-sequence reservoirs and sequence boundary reservoirs are developed in the northern part of the platform due to the high growth rate of carbonates,but neither of them is developed in the southern part of the platform due to the low growth rate of carbonates.The main reservoirs are closely related with the regression phase of second-order eustatic cycle.

Key words: intra-sequence reservoir, sequence boundary reservoir, growth rate of carbonates, reservoir prediction, Devonian-Lower Triassic, Shiwandashan

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