塔东古城地区深层油气藏岩溶储层预测

Deep karst reservoir prediction in the Gucheng area,Tarim Basin

塔东古城低凸起深层海相碳酸盐岩油气藏勘探潜力巨大,但由于目的层埋藏深、岩溶储层分布不清楚、储层含气性地震响应不明显,严重阻碍了该区的勘探进展。为了提高研究区奥陶系鹰山组岩溶储层预测精度,系统开展了白云岩储层和灰岩溶洞的预测及分方位油气检测。研究分析表明:属性优选和属性优化技术及BP反演技术可以有效地预测白云岩储层;方差属性和三维雕刻技术可以较好地刻画灰岩溶洞;分方位油气检测可以更好地消除断层影响、突出深层油气响应特征。研究成果明确了岩溶储层分布,预测了152km2白云岩有利储层面积和33.4km2灰岩溶洞面积,有效指导了区内井位部署。

Deep marine carbonate reservoirs in the Gucheng area,Tarim Basin reveals great exploration potential.But due to deeply buried targets,the karst reservoir distribution and gas bed response are unclear,which seriously impedes the exploration progress.In order to clarify the reservoir distribution,we predict dolomite reservoirs and limestone caves,and carry out hydrocarbon detection.According to our analysis,the attributes optimization and BP inversion can effectively predict dolomite reservoirs,and variance properties and 3D engraving can delineate limestone caves.Hydrocarbon detection can eliminate fault response influence.A152 km^2 dolomite reservoir block and a 33.4 km^2 limestone cave block are predicted,which is favorable for the well deployment in the future.