【作者】 黄庆华； 黄汉纯； 马寅生；

【Author】 Huang Qinghua;Huang Hanchun;Ma Yinsheng;Institute of Geomechanics,CAGS;

【机构】 地质力学研究所；

【摘要】 在研究柴达木盆地立体地质的基础上。本文应用多层非均匀介质理论和三维模拟方法,重塑了盆地生、储油层和基底三维应力、能量的空间分布状态,将其绘制成四维数据场空间图形,揭示出构造应力作为驱动力使油气运移聚集成藏的机理;探讨了盆地三维应力、应变能的分布规律与油气二次运移聚集模式,并评价了构造的控油性。更多还原

【Abstract】 From the view-point of the "stress driving" for oil,we lay emphasis on establishment of the stero-geological models of the Qaidam basin which include a basement layer（G）,three source beds（A,C and E） and three reservoir beds（B,D and F）,and have used the theory of multi-layered unisotropic medium and the 3-D photoelasticity modeling to calculate the size and direction of the structural stresses（σ₁ σ₂ σ₃） and the strain energy（w）,and plotted the various spatial diagrams,its contain 7 layers:source beds（A,C,E）,reservoir beds（B,D,F） and the basement（G）,plotted at the optimum direction 180°and 120° with positive and negative forms,and both vertical and lateral profiles.Finally,the spatial graphs are compiled into compact graphs.As is known to all,it is very difficult to make a 3-D stress analysis,we have selected10 typical petroliferous depressions and their adjacent anticlinal for the study.Correlations have been made in consideration with the known oil and gas fields,and analyses of basin have shown that:The stress and strain energy of the petroliferous rock series are important mechanical indexes for the migration of oil and gas.During the process of the migration and accumulation of petroleum,both the absorption and release of the stress and strain energy take place.The increase of stress and strain energy is favorable,the migration of petroleum,while their decrease favorable for the accumulation of petroleum.In the reservoir beds,the stress and strain energy values are higher in the depression than in their surrounding anticlinal rises,decreasing in the same direction as the values of stress and strain energy will be the most probable direction of the petroleum migration,and the low value areas will be the places for the accumulation of petroleum.On that basis,the following models may be built for the migration and accumulation of petroleum related to the structures and tectonic stress of the oil field;first,the oil and gas bodies in the reservoir beds migraling from the decreasing of the stress and strain energy;and second,the oil and gas bodies in the source beds migrating from the adjacent anticlinal convexes to the synclines or depressions.Therefore,oil reservoirs may also be formed in the low-stress,low-strain energy synclinal depressions.更多还原