基于蚂蚁追踪技术的裂缝型储层建模方法

储层中的裂缝具有明显的层次性,而且小尺度裂缝的发育分布受到大尺度裂缝的控制。针对这种情况,提出以蚂蚁追踪技术为基础,遵循层次建模的原则,通过分级控制分层次进行裂缝型储层建模。利用蚂蚁追踪技术生成蚂蚁属性体,运用断裂自动提取技术从属性体中提取断片,再采用确定性建模方法建立大尺度裂缝离散模型;利用蚂蚁体属性模型约束单井裂缝密度,使用退火模拟算法,通过插值得到裂缝密度分布模型。再在裂缝产状统计数据与裂缝密度分布模型的约束下,采用示点性过程的随机建模方法,建立小尺度裂缝离散模型;通过经验公式计算得出裂缝开度和传导率,再运用Oda数据统计算法,将裂缝网络模型粗化成裂缝属性模型。为该类油藏的开发提供理论基础。

Modeling of fractured reservoirs based on ant tracking technology

The fractures in the reservoirs have obvious hierarchy,and the distribution of small scale fractures are con-trolled by the large scale fractures. For this case,the paper proposed that based on the ant tracking technology,the fractured reservoir modeling was built according to the principle of hierarchical modeling. Using ant tracking technology to generate ant attribute body,and applying automatic extraction technology to extract fracture fragments from the ant body,then the deterministic discrete distribution model of large scale fractures was built. Under ant body volume constraints,the fracture density distribution model was generated through the single - well data interpolation by the methods of annealing simula-tion. And then under the constraints of fracture occurrence statistical data and the fracture density distribution model,the discrete distribution model of small scale fractures was set up by the method of object - based marked point processes sim-ulation. Calculating the aperture and transmissivity through empirical formulas,then we converted the discrete fracture net-work model into fracture properties model by the Oda statistical upscaling method. The method proposed in this paper can be used in fractured reservoir modeling and provides theoretical basement for reservoir exploration.