Identification Method of Gas and Water Layers in Extra Shallow Unconsolidated Formation: Taking the Heidimiao Reservoir in An Area of Daqing as an Example

  • ZHANG Wei ,
  • ZHANG Jianfeng ,
  • ZHAO Yuqiu ,
  • WANG Boyun
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  • 1. College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China;
    2. No. 9 Oil Production Company, Daqing Oilfield Company Ltd., Daqing 163853, China;
    3. College of Earth Science, Northeast Petroleum University, Daqing 163318, China

Received date: 2014-05-26

  Revised date: 2014-08-10

  Online published: 2014-11-14

Abstract

The compaction degree of the Heidimiao reservoir in a Daqing area is very low, the digenesis is poor, but the physical properties of the formation are good. Therefore the electrical characteristics of the gas layer are so close to those of the water layer that it is difficult to distinguish two kinds of reservoir layers. In order to solve this problem, this paper proposes to take the neutron logging as the sensitive curve of the gas layer based on the analysis of the relations between above mentioned properties. With the neutron logging curve as the central key, the cross-plots of the deep lateral resistivity, the density, the acoustic travel time are established to determine the lower limitation standard of the gas zone interpretation. According to the different matching relationships between the resistivity and the acoustic travel time or the spontaneous potential and, alternatively, between the neutron logging and the density, or the acoustic travel time in gas and water layers, a comprehensive and qualitative method is proposed to determine the gas layer by using the multi-curve overlapping combined with the gas logging data. In order to further enhance the gas response characteristics, the comprehensive judgment parameters are calculated by the multi-curve to interpret the gas layer quantitatively. Better results are achieved in distinguishing gas and water layers by using the cross- plots between these parameters and the spontaneous potential curve. The interpretation coincidence rate of the gas layer reaches 84.4% according to the verification by the results of 15 gas test wells' interpretation and their gas testing conclusions.

Cite this article

ZHANG Wei , ZHANG Jianfeng , ZHAO Yuqiu , WANG Boyun . Identification Method of Gas and Water Layers in Extra Shallow Unconsolidated Formation: Taking the Heidimiao Reservoir in An Area of Daqing as an Example[J]. Science & Technology Review, 2014 , 32(30) : 67 -73 . DOI: 10.3981/j.issn.1000-7857.2014.30.012

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