| Along with the exhaustion of conventional petroleum resources,the exploration and development of unconventional oil and gas resources have been given more and more attention in domestic and abroad.The coal bed methane and tight sandstone gas play an important place in the unconventional oil and gas,after the successful exploration and development in the United States,Canada and other countries,the coal bed methane and tight sandstone gas show their huge resource potential.The peripheral of Daqing have multiple coal-bearing basins,such as Jixi basin,Hegang basin,Boli basin and so on,the coal resources are rich,and provide good gas source for accumulation of coal bed methane and tight sandstone gas.So it is necessary to carry out the research of coalbed methane and tight sandstone gas accumulation conditions and resource potential in peripheral of Daqing basin,it is important to rich unconventional oil and gas resources exploration technology and theory for Daqing oil field,and provide favorable support for the stable yields of forty million tons in Daqing oil field.Analysis of this research in the full collection and digesting the successful exploration and development of coalbed methane and tight sandstone gas geological characteristics and reservoir forming conditions at home and abroad,on the basis of such informations summarize the basic reservoir forming conditions of coalbed methane and tight sandstone gas reservoir.It is that the structure is relatively stable,angle of coal seam is gentle;cumulative thickness of coal seam is large,gas content of coal seam is relatively high;coal adsorption capacity is strong,permeability is good;now coal seam is buried in between 300 to 1200m deep;the roof and floor of coal seam sealing and isolation ability is strong;local formation water is beneficial for the coalbed methane riching.Stable negative structural unit,adequate gas sources,continuously distribution of tight sandstone reservoir,source rocks and reservoirs closely stacked is beneficial for tight sandstone gas reservoir formation.Research on the basis of the above,Basin study area and select successful exploration and development of coalbed methane basins at home and abroad,make analogical analysis against the conditions of coal thickness,gas generating conditions,reservoir conditions,preservation conditions these four reservoir forming elements and its subdivision 11 geological conditions.Find that structural stability is poor and faults are developed in the study area;Hegang coal seam is developed,the thickness of single coal seam is small and the cumulative thickness is at medium level in Jixi and Boli basin;reservoir conditions are good,gas generating conditions are better,preservation conditions are poor.At the same time,structural conditions,preservation conditions,source rocks conditions,reservoir conditions and source-reservoir relationship of basin study area and selected tight sandstone gas basins at home and abroad divide to five big reservoir forming conditions and 12 geological conditions,evaluate the geological condition of Daqing peripheral basins.Research has shown that source rocks conditions and reservoir conditions of the study area are medium,;source-reservoir relationships better;preservation conditions and structural condition are poor.While applying the mathematical method of analytical hierarchy process,establish a set of resource abundance and potential evaluation system,make quantitative score for the reservoir-forming conditions and resource abundance potential of coalbed methane and tight sandstone gas.By the evaluation results,the overall abundance score of coalbed methane resource potential of the study area is low,it is 1/4?1/2 of the more successful exploration and development coalbed gas of San Juan basin.Basin study area in relative terms,Jixi basin coalbed methane resource abundance and potential score is highest,it is probably twice as much as the score of Hegang basin and Boli basin,has more exploration and development potential of coalbed methane.While from the tight sandstone gas resource abundance and potential results can be seen that the overall score of the study area tight sandstone gas resource abundance and potential is low,it is 1/5?2/5 of the more successful exploration and development tight sandstone gas of Alberta basin.Basin study area in relative terms,Jixi and Hegang basins tight sandstone gas resource abundance and potential scores higher,they are probably twice as much as the Boli basin and have more exploration and development potential of tight sandstone gas.Research on the basis of the above,apply analogy method and volume method(CBM),chemical kinetic theory(tight sandstone gas)for studying on coalbed methane and tight sand gas resource forecasting,then divide the favorable area according to the reservoir forming conditions.the coal bed gas resource Hegang of Jixi and Boli basin are respectively 164.95 billion m3,1430.46 billion m3 and 1300.76 billion m3 by analogy method calculation;Jixi and Boli basin resources are respectively 1800 billion m3 1420 billion m3 by volume method calculation.Based on the reservoir forming conditions making classification evaluation,select Jixi basin F block(Ji2,Ji3,Jicanl)and H block(Ji 1,Ji D2,Ji D8)as the favorable areas for exploration.Apply analogy method for forecasting,tight sandstone gas in Hegang basin resources amount is 766.54 billion m3,tight sandstone gas resource in Jixi basin is 922.17 billion m3,Boli basin tight sandstone gas resources amount is 1568.24 billion m.Chemical kinetic theory prediction of tight sandstone gas resource in Jixi basin is 568 billion m3?1753 billion m3,Boli basin tight sandstone gas resource is 615 billion m 3?1847 billion m3.Considering the construction location,hydrocarbon generation strength,reservoirs development and many other factors,divide favorable area in Jixi basin,predicted first favorable Lishu sag area is 138.1km2.the second favorable Jidong sag area is 138.8km 2?... |
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