基于沉积相—岩石类型控制的生物碎屑灰岩油藏三维地质建模方法研究——以伊拉克H油田白垩系Mishrif组为例  

Research on 3D geological modeling method of bioclastic limestone oil reservoir controlled by sedimentary facies and rock type——a case study of the Cretaceous Mishrif Formation in H Oilfield,Iraq

作　　者：衣丽萍[1] 许家铖 韩海英[1] 段天向[1] 吕洲 高敏 Yi Liping;Xu Jiacheng;Han Haiying;Duan Tianxiang;Lv Zhou;Gao Min(PetroChina Research Institute of Petroleum Exploration&Development)

机构地区：[1]中国石油勘探开发研究院,100083

出　　处：《中国石油勘探》2022年第2期150-162,共13页China Petroleum Exploration

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2017ZX05030-001)。

摘　　要：与碎屑岩储层相比,碳酸盐岩储层非均质性强,孔隙结构复杂,基于沉积相带分类的孔喉半径分布范围较宽、常规孔—渗关系较差,因此以沉积相控制储层物性的建模方式并不适用。以伊拉克H油田白垩系Mishrif组为例,通过地震、测井、地质、油藏动态等资料,在精细油藏描述与储层评价的基础上,依据岩石分类技术划分的岩石物理相与沉积相带间的内在成因联系,通过以沉积相模型为控制建立岩石类型模型,进而分岩石类型建立孔隙度、渗透率和饱和度模型,并结合静态、动态信息刻画隔层、夹层及高渗条带分布,修正渗透率,形成了一套基于沉积相—岩石类型分级控制的生物碎屑灰岩油藏三维地质建模方法。验证结果表明,利用此方法建立的地质模型较为可靠,能够充分反映储层的非均质性,数值模拟对各项动态指标的首次拟合率达到近65%。Compared with clastic reservoir,carbonate reservoir has strong heterogeneity and complex pore structures,as well as wide distribution range of pore-throat radius and poor relationship between conventional porosity-permeability based on the classification of sedimentary facies zone.Therefore,the modeling method of reservoir petrophysical properties controlled by sedimentary facies is not applicable.By taking the Cretaceous Mishrif Formation in Iraq H Oilfield as an example and using seismic data,well logging,geology,and dynamic performance of oil reservoir,the fine reservoir evaluation and oil reservoir description are conducted,and the internal genetic relationship between petrophysical facies and sedimentary facies is studied on the basis of rock type classification.Then the rock type model controlled by sedimentary facies model is established,and porosity,permeability and oil saturation models are established for different rock types.Following,the static and dynamic information are combined to characterize the distribution of barriers,interlayers and high permeability strips to correct the permeability model.Finally,a 3D geological modeling method for bioclastic limestone oil reservoir is developed based on the hierarchical control of sedimentary facies and rock types.The verification results show that the geological modeling method is reliable and can fully reflect the reservoir heterogeneity,with the fitting rate of each dynamic index reaching up to 65%in the first run of numerical simulation.

关 键 词：碳酸盐岩油藏 生物碎屑灰岩 伊拉克 三维地质建模 岩石类型 渗透率模型 饱和度模型 

分 类 号：TE319[石油与天然气工程—油气田开发工程]