相控地质统计学反演在薄层灰岩油藏精细描述中的应用

Application of phase controlled geostatistical inversion to fine description of thin limestone reservoir

针对礁灰岩油田储层超薄,非均质性强,油藏描述难度大,本文提出多级相控地质统计学反演的技术对策。纵向上相控利用生物礁地质模式及测井韵律指导储层概率变化,平面上相控采用确定性反演波阻抗与地震属性融合得到反映储层的变化规律。在纵向一维和平面二维联合相控基础上,结合地震反演和随机模拟的优势,能确保反演结果与测井数据吻合度高,灰岩超薄储层及其夹层在空间变化得到精细描述,为薄层灰岩油藏开发提供指导。

In view of the ultra-thin reservoir,strong heterogeneity and difficulty in reservoir description of reef limestone oilfield,this paper proposes the technical countermeasures of multi-stage facies controlled geostatistics inversion.In the vertical facies controlled,the reef geological model and logging rhythm are used to guide the reservoir probability change.In the plane facies controlled,the deterministic inversion P-impedance and seismic attribute are integrated to reflect the change law of the reservoir.On the basis of longitudinal 1D and planar 2D joint facies controlled,combined with the advantages of seismic inversion and random simulation,the inversion results can ensure a high coincidence with logging data,and the spatial changes of the ultra-thin limestone reservoir and its interlayers can be accurately described,providing guidance for the development of thin limestone reservoir.