摘要
对于低渗透油气田(藏)而言,储层地应力场是控制水力裂缝大小与方向的关键外部因素,在油田开发过程中,主地应力方向的研究对井网方向的确定至关重要,因此研究地应力的大小、方向及分布规律对油田开发具有重要的意义。根据现场实际情况,首先利用AN SYS对安塞油田储层建立有限元计算模型,并对其构造地应力进行正分析;在此基础上,利用matlab神经网络优化参数,得到储层的反演参数值;进而利用Ansys结合surfer8.0得到安塞油田储层构造地应力场的等直线图和表面图。结果表明:最大水平主应力方向为北东方向,大小为22-45MPa,模拟值与测量值相比的最大误差不超过9%,为油田今后的高效开发提供重要依据。
For low permeability oil and gas field , reservior stress field is the key external factors to control the size and direction of hydrofracture. Studying principal stress direction is essential to determine the well spacing direction in the development of the fracturing process as fracture extending direction depends on the direction of principal stress direction, so the size .direction and distribution laws of reservior stress field are significant to the development of oilfield. According to the actual conditions, the finite element model is conducted firstly, then caculating the reservoir optimizing inversion parameters with Matlab nerve network model, finally the equal linear map and surface map of Ansai Oilfield tectonic stress field are drawed by surfer 8.0 and Ansys. The results show that., the maximum principal stress direction is North-East ,the size is of 22-45MPa, the biggest error between simulation value and computation value is less than 9%. These results provide a important basis for the reservoir effective development in the future.
出处
《内蒙古石油化工》
CAS
2008年第5期151-154,共4页
Inner Mongolia Petrochemical Industry
