复杂裂缝性碳酸盐岩油藏数值模拟方法研究
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摘要
海洋沉积环境下的生物礁碳酸盐岩油藏多存在天然裂缝,加之气顶、底水等的影响使得这类油藏的渗流机理十分复杂,数值模拟难度非常大。以海上A油田为例,分析油田地质特征及地质研究成果,结合双重介质渗流理论,分析和研究油田裂缝性碳酸盐岩储层的渗流机理,建立适合裂缝性储层的等效连续介质渗流模型。通过添加基质毛细管压力、考虑重力作用建立基质-裂缝渗流交换,同时考虑气顶、底水的锥进以及注入水的突进等渗流机理,建立考虑气顶底水的裂缝性双孔双渗油藏数值模拟模型。拟合中充分考虑了裂缝、气顶、底水三者渗流机理的特征,利用分区分段的历史拟合思想,达到很好的拟合效果,为最终的调整方案设计及优化提供理论支持。
Under the marine sedimentary environment,there existed natural fractures,gas cap and bottom water in organic reef carbonate reservoirs,influenced by the factors,the percolation mechanism of reservoirs was very complex,and the influence of the gas cap and bottom water,the percolation mechanism of this kind reservoir was very complex.Numerical simulation of those reservoirs is very difficult.By Taking A Oilfield as an example,the geological characteristics and its research results were analyzed,and combined with the dual medium seepage theory,the percolation mechanism of fractured carbonate reservoir was analyzed and studied,a continuous equivalent percolation model of fractured reservoirs was established.by adding matrix capillary force and considering the gravity force,a matrix-fracture seepage exchange was set up,at the same time,the percolation mechanism of gas cap and bottom water coning and the breakthrough of injected water was taken into consideration,a dual porosity dual permeability fractured numerical simulation model was established.The characteristics of the percolation mechanism between the fractures,gas cap and bottom water are fully considered in the history matching,by using the ideas of zoning and section in history matching,good fitting effect is achieved,it provides a theoretical support for the design and optimization of final adjustment plan
Under the marine sedimentary environment,there existed natural fractures,gas cap and bottom water in organic reef carbonate reservoirs,influenced by the factors,the percolation mechanism of reservoirs was very complex,and the influence of the gas cap and bottom water,the percolation mechanism of this kind reservoir was very complex.Numerical simulation of those reservoirs is very difficult.By Taking A Oilfield as an example,the geological characteristics and its research results were analyzed,and combined with the dual medium seepage theory,the percolation mechanism of fractured carbonate reservoir was analyzed and studied,a continuous equivalent percolation model of fractured reservoirs was established.by adding matrix capillary force and considering the gravity force,a matrix-fracture seepage exchange was set up,at the same time,the percolation mechanism of gas cap and bottom water coning and the breakthrough of injected water was taken into consideration,a dual porosity dual permeability fractured numerical simulation model was established.The characteristics of the percolation mechanism between the fractures,gas cap and bottom water are fully considered in the history matching,by using the ideas of zoning and section in history matching,good fitting effect is achieved,it provides a theoretical support for the design and optimization of final adjustment plan
引文
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[4]黄灿,许发年,卢文涛.天然裂缝性油藏数值模拟研究新方法[J].内蒙古石油化工,2013,23(19):3~6.
[5]姚军,王子胜,张允,等.天然裂缝性油藏的离散裂缝网络数值模拟方法[J].石油学报,2000,31(2):284~288.
[6]张永生.气藏数值模拟中的储量拟合[J].天然气工业,1987,7(4):30~33.
[7]伍勇,兰义飞,蔡永利,等.低渗透碳酸盐岩气藏数值模拟精细历史拟合技术研究[J].钻采工艺,2013,36(2):51~54.
[8]池建萍,郑强,祁军,等.复杂裂缝性油藏历史拟合中的特殊做法[J].新疆石油地质,2004,25(5):517~519.