基于测井曲线及弹性薄板理论的应力场模拟

Stress Field Simulation Based on Log Curves and the Theory of Elastic Thin Plate

针对长庆油田延长组低孔低渗砂岩以裂缝型储层发育为主的特点,开展了区域应力场模拟研究,用于预测延长组的裂缝发育情况,指导后续勘探开发井的部署。由于研究区无地震资料,因此基于地震的传统裂缝检测方法无法适用。本次研究主要采用了基于以弹性薄板理论为基础的应力场模拟技术,充分利用常规测井曲线携带的速度及密度信息,克服了无地震资料的技术瓶颈,结合野外露头及岩芯测量结果,认为研究成果较为可靠,取得了较好的效果。目前已钻高产井均位于本次预测的强应力发育区,因此应力场模拟结果可以作为下一步生产井位部署的主要依据,此种技术方法也可以推广到长庆油田其他区块。

The Yanchang Formation of Changqing Oilfield is characteristic of fractured reservoir with low porosity and low permeability sandstone, so we carried out the research on regional stress field simulation, in order to predict the fracture devel- opment of Yanchang Formation, which can guide the exploration and development in the future. Because there is no seismic data in the research area, so the conventional research ways of fracture prediction are not suitable in research area. This article, based on log curves, used the theory of elastic thin plate to simulate the stress field, and made use of the density and P-wave carried by original log curves. Meanwhile, the authors also did some research such as the field profile measurement and core observation etc. Comparing the analysis results through a variety of means, we think we have got the better result in this re- search. The existing high production wells are all located in the strong stress zones. The stress field simulation results can be the most important guidance for location of production well next. This technical method can also be extended to other blocks in Changqing Oilfield.