井间储层微裂缝及断层对注水开发的影响分析

Effect of Interwell Reservoir Micro-Fractures and Faults on Water Injection Development

近年来,随着油藏开采进一步深入,开发难度越来越大。裂缝性油藏在注水开发过程中,注入水沿储层微裂缝方向快速突进,油井暴性水淹,导致开发效果变差。常规井间地震解释中,解释结果受到多种因素的影响,很多细小的不连续反射轴会被平滑掉,出现小断层、微裂缝遗漏等现象。结合相干体解释技术,减少解释人员的主观判断干预和经验因素,更客观、合理地对微裂缝及小断层位置进行刻画。以中国长庆油田某地区井间地震勘探实例为基础,结合常规地震反射剖面和地震相干技术,进行小断层、微裂缝综合解释,提高断层的解释精度,并结合吸水剖面验证其真实性与可靠性。

In recent years,with the deepening of the exploitation in petroleum reservoir,it’s more difficult to develop the petroleum reservoir.In the process of waterflooding development of fractured oil reservoir,the injected water rapidly penetrates along the micro fracture direction of the reservoir,and the oil well is flooded by water,which leads to poor development effect,is a common feature of waterflooding development of fractured oil field.In conventional crosswell seismic interpretation,the interpretation results are affected by many aspects,and many small discontinuous reflection axes will be smoothed out,resulting in the omission of small faults and micro fractures.Combining coherence cube interpretation technology,the subjective judgment intervention and experience factors of interpreters can be reduced,the location of small faults and fractures can be described more objectively and reasonably.Based on the example of crosswell seismic exploration in Changqing oilfield,This paper combine the coherence technique of seismic and conventional seismic reflection profile,conduct comprehensive interpretation of small faults and micro-cracks.At the same time,the authenticity and reliability are verified by water absorption profile.