裂缝性低渗透砂砾岩油藏开发效果影响因素研究——以盐家油田盐22块油藏为例
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摘要
裂缝性低渗透砂砾岩油藏在我国分布较广,储量较大,摸清各类地质开发因素对其开发效果的影响规律,对提高油藏采收率,保持我国石油工业持续稳定发展具有重要意义。以盐22块油藏为例,基于测井、地震资料和裂缝表征结果,采用随机建模方法建立了精细三维基质与离散裂缝网络模型,应用双渗模型对油藏储集条件、注水方式、井网形式等因素进行研究。结果表明,随着裂缝发育程度的增加,油藏开发效果先变好后变差,中等裂缝发育的油藏开发效果最佳;裂缝孔隙度、渗透率越大,油藏开发效果越好;周期注水方式优于连续注水方式,且存在最优停注比;矩形五点井网对于该类油藏适用性较强,开发指标优于菱形反九点井网、线状井网和正方形反九点井网。
Fractured low permeability glutenite reservoirs were widely distributed and had larger reserves in China.To clarify the influential rules of geological factors on the development effect was of great significance of enhancing oil recovery and maintaining the stable development of China's petroleum industry.By taking a typical oil reservoir for example,the three-dimensional matrix model and discrete fracture network model were built by using stochastic modeling method based on seismic and logging data and the results of fracture characterization.On the basis mentioned above,water injection modes,shape of well pattern and so on,were studied by using dual-permeability model.The results show that with the increase of fracture growth level,the reservoir development effect changes form better to worse.The mid-level developed fractured reservoirs have the best effect.The greater the fracture porosity and permeability are,the better the reservoir development effect is.Cyclic water injection performance is better than that of continuous water injection.There is an optimal ratio of stop-injection to water injection.The rectangular five-point well pattern is better than that of rhombus inverted nine-spot well pattern,reverse nine-spot well pattern and linear well pattern.
Fractured low permeability glutenite reservoirs were widely distributed and had larger reserves in China.To clarify the influential rules of geological factors on the development effect was of great significance of enhancing oil recovery and maintaining the stable development of China's petroleum industry.By taking a typical oil reservoir for example,the three-dimensional matrix model and discrete fracture network model were built by using stochastic modeling method based on seismic and logging data and the results of fracture characterization.On the basis mentioned above,water injection modes,shape of well pattern and so on,were studied by using dual-permeability model.The results show that with the increase of fracture growth level,the reservoir development effect changes form better to worse.The mid-level developed fractured reservoirs have the best effect.The greater the fracture porosity and permeability are,the better the reservoir development effect is.Cyclic water injection performance is better than that of continuous water injection.There is an optimal ratio of stop-injection to water injection.The rectangular five-point well pattern is better than that of rhombus inverted nine-spot well pattern,reverse nine-spot well pattern and linear well pattern.
引文
[1]李联伍,许学康,高约友,等.双河油田砂砾岩油藏[M].北京:石油工业出版社,1997.
[2]Amir Abbas Askari,Mohammad Reza Kamali.Model tanking and optimization of fractured reservoir using streamline simulation,casestudy agas condensate reservoir[A].SPE Saudi Arabia Section Technical Symposium and Exhibition,Saudi Arabia,2009.
[3]胡复庙.砂砾岩油藏开发模式[M].北京:石油工业出版社,1997.
[4]于银华,喻高明.裂缝性砂岩特低渗油藏合理井网研究[J].石油天然气学报,2006,28(4):332～334.
[5]王万彬,郭肖.裂缝性低渗透砂岩油藏井网与裂缝方位的匹配研究[J].石油天然气学报,2009,31(2):315～318.
[2]Amir Abbas Askari,Mohammad Reza Kamali.Model tanking and optimization of fractured reservoir using streamline simulation,casestudy agas condensate reservoir[A].SPE Saudi Arabia Section Technical Symposium and Exhibition,Saudi Arabia,2009.
[3]胡复庙.砂砾岩油藏开发模式[M].北京:石油工业出版社,1997.
[4]于银华,喻高明.裂缝性砂岩特低渗油藏合理井网研究[J].石油天然气学报,2006,28(4):332～334.
[5]王万彬,郭肖.裂缝性低渗透砂岩油藏井网与裂缝方位的匹配研究[J].石油天然气学报,2009,31(2):315～318.
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