渤海油田渤中A构造太古宙潜山裂缝储层预测

The prediction of Archean buried hill fracture reservoir in BZ-A structure of the Bohai oilfield

钻井揭示渤海油田渤中A构造太古宙潜山拥有巨大的天然气勘探潜力,而目标区太古宙变质岩潜山裂缝储层面临埋深大、非均质性强、横向变化快等问题,制约了该区勘探评价的顺利实施。本次研究从潜山裂缝储层的成因机理出发,分别对风化裂缝带和内幕裂缝带储层特征进行综合分析,开展了针对性的潜山裂缝储层预测技术研究。对于风化带裂缝储层,创新采用基于双参数叠前裂缝储层孔隙度预测技术,通过三维弹性参数交会分析开展裂缝储层孔隙度预测,精细描述了风化带裂缝储层发育情况。针对潜山内幕裂缝储层,在F-K域相干增强技术改善潜山内幕有效反射成像的基础上,采用基于聚类分析的边缘增强裂缝检测技术,对潜山内幕裂缝发育规律进行了综合表征。针对性裂缝储层预测技术的综合应用,有力助推了渤中A构造勘探评价,也为目标区下一步勘探评价提供了重要依据。

Drilling has revealed that the Archean buried hill of BZ-A has great potential for natural gas exploration.In the target area,the metamorphic rock fracture reservoir in Archean buried hill has many problems such as great buried depth,strong heterogeneity of the reservoir and rapid lateral changes,which pose challenges to the exploration.Based on the study of the genetic mechanism of fractured reservoirs in buried hill,the authors comprehensively analyzed the features of the weathered fractured zone and the inner fractured zone,and established a targeted technical system for the description of fractured reservoirs in buried hill.For the weathered zone fractured reservoir,the pre-stack fracture reservoir porosity prediction technology based on the double-parameter was innovatively used,and the fracture reservoir porosity was predicted by the 3D elastic parameter analysis,and the distribution of the fractured reservoir in the weathered zone was finely described.For the inner fractured zone,the F-K domain coherence enhancement technique was used to improve the imaging of the buried hill.The method of edge enhanced crack detection based on clustering analysis was used to comprehensively characterize the distribution of reservoir in the inner fracture zone.Through the comprehensive application of targeted geophysical techniques,the exploration evaluation of BZ-A has been strongly promoted,thus providing a strong basis for the further exploration evaluation of the target area.