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为研究大民屯凹陷构造应力场与油气运聚的关系,根据其地质及区域构造应力场特征,建立了研究区三维构造应力场有限元模型,并通过数值模拟分析,得到了太古界和元古界的最大主应力、最小主应力和最大剪应力等应力分布,在此基础上结合油气运移理论对研究区的油气富集区进行预测。结果表明:在构造应力场的作用下,油气运移与富集的方向为从地应力场的高值区向低值区和从流体势场的高势区向低势区;应力低值区、流体势场低势区和油气运移所经由的靠近断裂带的圈闭是油气聚集的有利部位。综合预测结果和已完钻井的产能情况表明,油气井中的高产井区与地应力场和流体势场的低值区相吻合。
In order to study the relationship between the tectonic stress field and hydrocarbon migration and accumulation in the Damintun depression, the finite element model of three-dimensional tectonic stress field in the study area was established according to the geologic and regional tectonic stress field characteristics. By means of numerical simulation, The maximum principal stress, the minimum principal stress and the maximum shear stress of the ancient boundary. On the basis of this, combined with the theory of hydrocarbon migration, the hydrocarbon enrichment area in the study area is predicted. The results show that under the action of tectonic stress field, the direction of hydrocarbon migration and enrichment is from high value region to low value region and from high potential region to low potential region of fluid potential field. The low stress region , And the traps near the fault zone via the low potential area of fluid potential field and the hydrocarbon migration are the favorable sites for hydrocarbon accumulation. The results of the comprehensive prediction and the production capacity of the completed wells indicate that the high-yielding well zones in the oil and gas wells are in agreement with the low-value areas of the geostress and the fluid potential.