地震储层综合预测技术在鄂尔多斯盆地合水地区的应用

Reservoir prediction in the Heshui area,Ordos Basin

鄂尔多斯盆地合水地区是近年来勘探评价的重点地区。该区含油层系多,区内除三叠系延长组长3油层组以上及侏罗系地层发育的岩性—构造油藏,还有在长6、长8段发育岩性油藏,均是未来重要的储量接替区。长3段以上侏罗系油藏存在油藏规模小、分布规律不清;长6、长8油藏储层厚度为10~25m,比较薄,且横向变化快,含油丰度差异大。针对这些难点,利用二维地震测线,采用GeoEast解释系统中的构造变速成图、有约束神经网络砂体厚度预测、流体活动性油气检测等技术,对该区主要目的层构造形态及前侏罗纪古地貌特征进行精细描述,对主要目的层砂体及含油性进行检测,取得了较好的效果。

The Heshui area,Ordos Basin is a hotspot of the hydrocarbon exploration in recent years.There are quite a few oil-bearing strata in the area such as Chang 3,Triassic Yanchang Formation,Chang 6 and Chang 8,Jurassic lithologic structural reservoirs.However Jurassic reservoirs have small sizes and a unclear distribution pattern,and lithologic structural reservoirs are characterized by thin thickness,lateral rough variation,and large difference of oil-bearing abundance.To overcome these difficulties,we conduct reservoir prediction with seismic interpretation tools provided by GeoEastsuch as varying-velocity structure mapping,constraint neural network,fluide activity,etc.Finally sand thickness,oil-bearing strata,and structure pattern in the area are accurately characterized.