Study On The Accumulation Of Multi-energy Resources In Kuqa Depression

Kuqa depression is at the north margin of Tarim Basin.It borders Tianshan orogenic belt to the north.It has undergone many tectonic movements and formed three sags and four uplifts on structural framework.Kuqa depression has many kinds of energy resources including conventional oil & gas,coal.Kala 2 Gas Field that The resource is over 100 billion cubic meters is in Kuqa depression.Unconventional energy resources such as shale gas,tight sandstone gas,coal bed methane and oil sands have a very substantial amount of resources in Kuqa depression.Various energy resources distribute complex and orderly in time and space.They also interact with each other in the process of accumulation after research on the accumulation of every kind of energy resource.Kuqa depression has the character that oil is in south part,gas is in north part,wet natural gas is in east part,dry natural gas is in west gas in plan.Oil resource mainly distributes in the south slope zone.Natural gas distributes in KeYi structural belt of north part and the eastern Qiulitage structural belt.There is condensate gas in the south slope zone.Coal and coal bed methane are mainly distribute in Kubai coalfield and Yangxia area.Oil sands distributes in piedmont of Tianshan Mountain.Tight sandstone gas distributes in stable tectonic belt of Baicheng sag and Yangxia sag.Shale gas distributes in shallow layer of Keyi structural belt in north.Source rocks distributes in Triassic and Jurassic stratum and are big in thickness of deposit.The kerogen types are mainly Ⅱ2 and Ⅲ.Kerogen has higher abundance of organic matter.The organic matter maturity is high.The kerogen has the hydrocarbon-generating potential in gas mainly now.On the vertical distributions of the formation,reservoir is mainly in cretaceous and Paleogen stratas,and Jurassic and Neogene stratas are secondary.Two gypsolyte beds of Paleogen and Neogene are good regional seal.Then Kuqa depression has developed several reservoirs and cap rock assemblages.These factors are the premise to the formation of large or middle size gas fields.Faults have connected the source rocks and reservoirs.Thermal evolution of source rocks in Jurassic and Triassic strata is the basis for the formation,distribution,and combination of energy and mineral resources in this area.The paper collect people’s the lithology and the proportion of layer porosity and permeability,thermal conductivity,heat flow and geothermal gradient data et al,layout one artificial single well each on the three seimic profiles of west、middle and east of Kuqa depression.We can use the method of Basinmod to study the simulation of the burial history and the hydrocarbon generation history.The middle and west part and east simulated wells separately in 130,125,110 Ma degree of heat up to 0.5% degrees,the thermal maturity of the Midwest is higher,Ro is greater than 2% in dry gas generating stage,and lower in the East,Ro in 1.0~2.0%,the moisture generated.As the basis of the hydrocarbon evolution,combined with related geological conditions,study the relevance of enrichment of multi-energy resources,divide into the multi-energy resources developed belt of the north、central and south of Kuqa depression,to provide a theoretical basis of energy exploration in Kuqa depression in the future.