深水浊积水道构型及岩石类型划分与三维地质建模——西非下刚果盆地A油田为例  

Deep Water Turbidity Channel Configuration and Rock Type Classification and Three-dimensional Geological Modeling: A Case Study of A Oilfield in the Lower Congo Basin in West Africa

作　　者：王丙震 张文彪[1] 段太忠[1] 徐睿[1] WANG Bing-zhen;ZHANG Wen-biao;TAI Zhong-duan;XU Rui(Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《科学技术与工程》2018年第36期26-35,共10页Science Technology and Engineering

基　　金：国家重大科技专项(2016ZX05033-003-002);中石化科技部项目(P170004-4)资助

摘　　要：深水浊积岩油藏高效开发离不开精准地质模型的支持,如何让建立的地质模型更体现"储、渗"性能差异的特点,是需要探索解决的难题之一。形成了一种构型层次控制下,不同岩石类型约束的油藏建模思路。综合岩心、测井、地震及露头类比等资料,首先根据水道体系沉积特征划分了5类沉积构型要素,建立了构型模式;根据岩心描述结果划分了8类岩相,并结合孔、渗分布规律总结出5类岩相;按照层次建模的思路,在构型约束下建立了三维岩石模型。研究结果表明:水道体系不同沉积位置具有不同的岩性特征及地震发射特征,决定着构型要素的分类;对于成岩作用较弱的浊积岩,岩相与岩石类型之间在储集性能及渗流特征上规律一致,按孔、渗交会关系划分的岩石类型,更能体现渗流特征的差异;构型约束下的岩石类型模型,融合了静态地质岩性变化与动态渗流变化两者的优势,建模结果的优势也得到分析检验。研究在常规浊积水道储层建模技术中引入了岩石类型的作用,形成了一套更贴近油藏流体变化规律的建模思路,具有一定的理论与实践指导作用。An accurate geological model is necessary for efficient development of deep-water turbidite reservoir, whereas how to characterize reservoir fluid flow behavior in a static model is a difficult problem to be solved. Based on the data of comprehensive core, well logging, seismic and outcrop analogy, five types of architecture elements were divided according to the sedimentary characteristics of the channel system, and the architecture pattern was established. Afterwards, 8 types of litho-facies were classified in line with core decryption and 5 types of rock types were summarized in term of the correlation between porosity and permeability. Finally, three-dimensional rock type model was established under the hierarchical architecture constraint accordingly. The result reveals that different sediment position of turbidite channel system has different lithological characteristics and seismic reflection characteristics, also determine the classification of architecture elements. For turbidite with slightly diagenesis, the characteristics of porosity and permeability are consistent with the lithofacies and rock types, and rock type divided by the poro-perm correlation would reflect difference of flow characteristics. Rock type model under the architecture constraint combining laws both of the static lithology and flow characteristics, and the modeling results also verified by the statistical rule from well data. This study is attractive in using the rock type as the flow unit, forming a new geomodeling approach and instructive both in theory and practice.

关 键 词：浊积水道 沉积构型 岩石类型 地质建模 

分 类 号：TE319[石油与天然气工程—油气田开发工程]