非均质储层三维构造应力场模拟方法

doi:10.13278/j.cnki.jjuese.201605306

摘要/Abstract

摘要：

浊积砂低渗透储层为一种重要的储层类型，因其构造形态复杂、非均质性强等特点，极易导致其内部构造应力场异常分布；准确计算该类型储层的应力场分布、识别构造应力场异常区，对低渗透油藏的开发具有重要的指导意义。本次研究中，首先，在PETREL系统中依次建立浊积砂储层构造模型、浊积砂储层沉积微相模型和浊积砂储层层速度模型，并根据纵横波速度转换关系、纵横波速度与动态岩石力学参数转换关系、动静态岩石力学参数转换关系，由浊积砂储层层速度模型计算得到三维岩石力学参数模型；其次，将PETREL系统中的浊积砂储层构造模型转换为ANSYS系统中的浊积砂储层几何模型，解决浊积砂储层构造形态复杂的问题；然后，进行网格划分，并按照“距离扫描法”将三维岩石力学参数加载到浊积砂储层ANSYS有限元分析模型中，从而解决“非均质性强”的问题；最后，根据浊积砂储层区域构造背景及单井实测的地应力状态，设置初始边界条件和负载，进行计算。井点实测应力值和应力方向的检验表明，模拟结果准确可靠，能够体现出受浊积砂储层构造形态和储层非均质性影响而引起的局部构造应力场的异常。

关键词: 三维构造应力场模拟, 浊积砂储层, 低渗透储层, PETREL与ANSYS联合建模, 东营凹陷

Abstract:

The Boxing depression where Palaeogene low-permeability sandstone reservoirs (LPSR) are widely distributed is an important oil-bearing depression in Bohai bay basin. Influenced by multi-stage tectonic inversions and reservoir hererogeneities, the stress field of these reservoirs is so complex that hydraulic fracturing according to results obtained in the simulation method for homogeneity reservoirs is of no avail. In this paper, to improve the accuracy of stress field simulation of heterogeneous reservoirs, the simulation method was mainly modified in three aspects: structure model, rock mechanics parameters (RMP) and boundary constrains. ① The structure and interval velocity models with PETREL was built. The interval velocity model built in the way of facies-controlled modeling can include all the heterogeneity features of the LPSR, such as, facies, lithology, physical properties and so on. ② The reverse engineering of cloud data was used to transfer the PETREL structure model into the ANSYS mechanical model. ③ The relation of the interval velocity and RMP in the study area were calculated, and the PETREL interval velocity model was translated into the RMP model. So, the RMP in every element of the ANSYS mechanical model was got. ④ Boundary constrains were inverted by the stress of fractured wells which were evenly distributed in the study area. After the result was carried out, we examined it with the stress of reserved fractured wells and found it was reliable.

Key words: 3D numerical simulation of structural strain, turbidite sand reservoir, heterogeneous reservoir, joint modeling of PETREL and ANSYS, Dongying depression

中图分类号:

P631.4

朱传华, 王伟锋, 王青振, 李玉坤. 非均质储层三维构造应力场模拟方法[J]. 吉林大学学报(地球科学版), 2016, 46(5): 1580-1588.

Zhu Chuanhua, Wang Weifeng, Wang Qingzhen, Li Yukun. Numerical Simulation of Structural Strain for Turbidite Sands Reservoirs of Low Permeability[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(5): 1580-1588.

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