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The overall exploration method and favorable area predition of natural gas in the coal-bearing strata,Qinshui Basin,China

Lin Yu-xiang,Shu Yong,Zhao Cheng-jin,Li Xia,Zhang Chun-rong   

  1. College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China
  • Received:2016-11-30 Revised:2017-04-25 Online:2017-05-10 Published:2017-05-10

Abstract:

Exploration practices show that coal,shale,dark mudstone and dark limestone can generate gas in coal-bearing strata.And the gas generation process is continuous and has the characteristics of multisource and multistage.Coal-bearing source rock provides adequate supply of gas.In addition,the thickness of coal-bearing strata is big,and the distribution is wide.It follows that coal-bearing strata have great potential of natural gas.Natural gas of different phase has different occurrence mechanism.And there exists dynamic transformation between each other.The internal system of source rock are mainly free gas and adsorbed gas,which can form coal bed methane(CBM) reservoir and shale gas (SG) reservoir.Free gas in the internal system after primary migration exists in the form of free gas in external source system,dissolved gas and adsorbed gas in transport system.The external source system mainly formed conventional gas (CG) reservoir,tight gas (TG) reservoir and water-soluble gas (WSG) reservoir.The gas characteristics of coal-bearing strata with multisource,multistage and dynamic transformation lead to the symbiosis phenomenon of multiple gases in different reservoirs.Through the establishment of symbiotic model of the multiple gas reservoir in the coal-bearing strata,this article analyzed the formation mechanism and distribution of different types of gas reservoirs and put forward the concept and basic method of overall exploration in coal-bearing strata.Overall exploration focused not only on the target layers,but also on an overall consideration exploration style with “multi-depth,multiple and full range”.Through overall planning,optimization program and collaborative deployment,it will realize the goal of rapid and efficient exploration.Taking Qinshui Basin as an example,seven exploration combination modes were put forward: symbiotic combination of four types of gas reservoirs: CBM+TG+SG+CG;three types:CBM+TG+SG and CBM+TG+CG;two types: SG+CG;one type: CBM,SG or CG.Furthermore,the favorable distribution areas of different types of gas reservoirs were made clear and the suitable overall exploration methods were put up in Qinshui Basin.

Key words: Overall exploration, Coexistence combination, Natural gas reservoir, Multi source and multi state, Coal-bearing strata, Qinshui Basin

CLC Number: 

  • TE357

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