宁晋断裂陡坡带近岸水下扇体储层的地震预测

Seismic prediction of near-shore underwater fan reservoir in Ningjin fractured steep slope belt

宁晋断裂陡坡带近岸水下扇体纵向上的期次叠加和横向上的频繁摆动迁移导致其非均质性强,准确地预测扇中发育区和有利含油气区是该区地震勘探的关键。根据研究区近岸水下扇体的沉积特点和实钻情况,总结其地震反射特征,利用地震相方法预测近岸水下扇体的发育规模和期次。利用三维可视化、地震属性分析等方法进一步落实了近岸水下扇体扇中亚相发育区。基于扇中亚相发育区预测结果,结合属性叠加方法,预测了宁晋断裂陡坡带2号近岸水下扇体的扇中亚相发育区和含油气有利区域。根据预测结果部署了探井Gy33井,钻探结果表明该井产油为23.36 t/d,证实了预测结果的可靠性。

Near-shore underwater fan in Ningjin fractured steep slope belt is the fan-shaped glutenite body quickly accumulated by flood water and muddy flow,which has strong heterogeneity because of vertically overlaying of phases and horizontal frequently swing and moving.The key of the exploration is to accurately predict the favorable hydrocarbon bearing zone.In terms of the sedimentary characteristics and drilling data of near-shore underwater fan in the area,we summarized its seismic reflection features,and predict its development phases and scale by using seismic facies method.By utilizing 3D visualization and seismic attribute analysis,the middlefan subfacies was further identified.Based on the prediction result of middle-fan subfacies,combining with attribute stack method,the distribution of middle-fan subfacies and favorable hydrocarbon bearing zone of No.2 near-shore underwater fan was predicted.The well Gy33 was deployed by the above research result,and its oil production is 23.36 t/d,which proved the reliability of prediction results.