黄河口凹陷BZ油田古近系层状火成岩发育模式及精细刻画

Development Patterns and Fine Characterization of the Paleogene Stratified Igneous in BZ Oilfield of Huanghekou Sag

渤海BZ油田各井在古近系含油层段内钻遇3.2~42.8 m的火成岩,呈单层层状镶嵌在碎屑岩储层中。针对该油田火成岩发育机理认识不清及储层预测困难问题,应用钻井、测井及三维地震资料总结层状火成岩发育模式及控制因素,利用基于振幅分级及火成岩构型的等效厚度描述技术,开展单层厚层和薄层火成岩发育段的定量刻画。研究结果表明:在渤海BZ油田古近系各层段共发育26个层状火成岩发育区,面积为0.07~2.47 km 2,平面上叠置连片,纵向上火山活动逐渐增强,火成岩分布规模逐渐变大。该研究可为BZ油田储量计算和井位部署奠定基础。

The wells in Bohai BZ Oilfield drilled across the igneous rock with a thickness of 3.2~42.8 m within the Paleogene oil-bearing interval,which was embedded in the clastic reservoir as individual stratified form.In order to clarify the development mechanism and improve the reservoir prediction,the drilling,logging and 3D seismic data were used to summarize the development patterns and controlling factors of the stratified igneous rock.The equivalent thickness characterization based on the amplitude grading and igneous rock configuration was used to quantitatively characterize each igneous layer with large and small thicknesses.Research indicates that there are 26 zones with well-developed igneous rock in the Paleogene stratum of Bohai BZ Oilfield and the corresponding area is 0.07~2.47 km 2.The igneous rock is featured by superimposition on the plane,gradually increase of volcanic activity and increasing distribution scale in the longitudinal direction.This research could lay a foundation for the reserve calculation and well deployment in BZ Oilfield.