摘要
轮南油田奥陶系油气藏为裂缝油气藏,油气藏形成受裂缝发育控制。裂缝埋深在5000m以下,由多期构造运动产生,发育机理非常典型、复杂。通过观察、描述岩心的裂缝发育特征,分析在发育过程中深度、温度、围压等环境条件的变化以及后期发生的剥蚀、裂缝充填等改造作用对地下岩体力学性质的影响,确定裂缝发育的控制因素和数值模拟参数。进而通过数值模拟,计算了裂缝发育概率分布和发育方位。根据计算结果,探讨了轮南地区奥陶系裂缝的发育机理,结合井内流体测试结果,分析了裂缝分布对流体的控制和油气藏形成模式。因此认为,综合分析裂缝形成过程及各种控制因素,定量分析其影响程度,求取经验公式,应用于应力场计算和裂缝预测模型,可以对裂缝发育区分布和裂缝发育特点做出较为准确的定量预测;综合分析各种影响因素,逐期计算各期裂缝的发育情况和应用数理统计技术求取回归关系式,是预测现今裂缝分布的关键;结合实验结果,建立确定模型参数的多元统计回归方程,是模拟最重要的基础工作。
; Ordovician reservoir in Lunnan Oil Field is a fractured reservoir. Its formation is controlled by fracture development. The fractures are buried deeper than 5000m, formed from multistage structural movement, and controlled by several factors in the process of evolution. The development is typical and complicated. Through observing and describing the fracture development characteristics of cores, this paper analyzes the effect of environmental change including depth, temperature and confined pressure and later movement including denudation and fracture filling on mechanic characteristics of subsurface rock body, so as to determine the controlling factors and numerical simulation parameters of Ordovician fractures. Using numerical simulation, it calculates the probabilistic distribution and development azimuth of fractures. According to calculation, it discusses the development mechanism of Ordovician fractures in Lunnan area. Combiningwith inner-well testing, it analyzes the controlling effect of fracture distribution on fluid and reservoir formation pattern.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2006年第2期5-8,共4页
Petroleum Geology & Oilfield Development in Daqing
关键词
裂缝油气藏
破裂概率
流体活动
裂缝预测
成因模式
轮南油田
fractured reservoir
break probabilistic
fracture prediction
genesis pattern
Lunnan Oil Field
