Evaluation of Gas-bearing Property for Shale Reservoir and Its Influence Factors Analysis:Taking Changning-Weiyuan National Experimental Zone as an Example

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  • Exploration and Development Institute of Southwest Oil & Gas Field Company,PetroChina,Chengdu 610041,China

Received date: 2013-12-17

  Revised date: 2014-03-21

  Online published: 2014-10-10

Abstract

Evaluation of gas-bearing property for shale reservoir and its influence factors analysis were important research.It helps to manage the shale gas wells scientifically and to improve the effect of shale gas field development.With field data of Changning-Weiyuan national experimental area,a new technique was constructed to evaluate the gas-bearing property of shale reservoir and to analyze its influence factors.We launched quantitative analysis by using the feature attributes data.The technique could automatically divide the gas formation into different layers for multiple gas wells and launch the quantitative analysis of influencing factors.By using the aggregation clustering method and multiple discriminal method,the shale gas reservoirs were divided into three types,typeⅠ,Ⅱand Ⅲ.Discriminant functions were established for these three class gas reservoirs.The influencing factors were analyzed by using multivariate statistical multiplexing principle.The analysis results showed that the gas reservoirs of typeⅠwere matrix-based shale gas layers,the gas reservoirs of typeⅡwere fracture-based shale gas layers,the gas reservoirs of type Ⅲ had less fractures than typeⅡ.The discriminant functions could automatically identify the unknown types of shale gas reservoirs.The main factors influencing the gas content of shale included content of free gas,porosity,content of organic carbon,permeability and content of absorbed gas.The brittle mineral content,burial depth and thickness had a relatively small effect on the gas content of shale.
 

Cite this article

LI Wu-guang,ZHONG Bing,YANG Hong-zhi,FENG Xi . Evaluation of Gas-bearing Property for Shale Reservoir and Its Influence Factors Analysis:Taking Changning-Weiyuan National Experimental Zone as an Example[J]. Natural Gas Geoscience, 2014 , 25(10) : 1653 -1660 . DOI: 10.11764/j.issn.1672-1926.2014.10.1653

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