石油学报 ›› 2016, Vol. 37 ›› Issue (12): 1518-1527.DOI: 10.7623/syxb201612007

• 油田开发 • 上一篇    下一篇

基于“二次震控”的三维油藏建模新方法

谭学群, 廉培庆, 张俊法, 王鸣川, 李艳华, 杜秀娟, 王桐   

  1. 中国石油化工股份有限公司石油勘探开发研究院 北京 100083
  • 收稿日期:2016-03-23 修回日期:2016-09-26 出版日期:2016-12-25 发布日期:2017-01-06
  • 通讯作者: 谭学群,男,1967年6月生,1990年获石油大学(华东)学士学位,2003年获中国地质大学(北京)博士学位,现为中国石油化工股份有限公司石油勘探开发研究院高级工程师,主要从事油气田开发工作。Email:tanxq.syky@sinopec.com
  • 作者简介:谭学群,男,1967年6月生,1990年获石油大学(华东)学士学位,2003年获中国地质大学(北京)博士学位,现为中国石油化工股份有限公司石油勘探开发研究院高级工程师,主要从事油气田开发工作。Email:tanxq.syky@sinopec.com
  • 基金资助:

    国家重大科技专项(2016ZX05033-003)资助。

A new method for 3D oil reservoir modeling based on “double seismic constraint”

Tan Xuequn, Lian Peiqing, Zhang Junfa, Wang Mingchuan, Li Yanhua, Du Xiujuan, Wang Tong   

  1. Sinopec Research Institute of Petroleum Exploration and Production,Beijing 100083,China
  • Received:2016-03-23 Revised:2016-09-26 Online:2016-12-25 Published:2017-01-06

摘要:

为提高孔隙度—渗透率建模的精度,常规方法通常采用地震约束或沉积相约束,即“震控”或“相控”。但无论“震控”还是“相控”,约束的都是孔隙度模型,因此无法从根本上提高渗透率模型的精度。为解决碳酸盐岩油藏渗透率预测难的问题,首先划分了岩石类型,并在此基础上提出了基于“二次震控”的建模新方法:即通过地震反演波阻抗数据体约束,分别建立岩石类型模型和孔隙度模型,再根据每种岩石类型下的孔隙度—渗透率关系最终建立渗透率模型。“二次震控”的核心是建立波阻抗数据和岩样孔喉半径的关系,进而准确建立岩石类型模型。其突破了地震波阻抗这一连续型变量难以约束岩石类型这一离散型变量的瓶颈,转而约束与岩石类型有关的孔喉半径这一连续型变量,再用截断高斯转换成岩石类型。不仅提高了空间上任意一点岩石类型的预测精度,继而提高了渗透率的预测精度,也省略了通过测井曲线预测井点处岩石类型的复杂环节。应用两口新井进行验证,其精度较高。

关键词: 岩石类型, 二次震控, 地震波阻抗, 油藏建模, 渗透率预测

Abstract:

To improve porosity-permeability model accuracy, seismic constraint or sedimentary-facies constraint has often been adopted in conventional methods. However, it is porosity that both of them constrain, rather than permeability, thus the accuracy of permeability model cannot be radically improved. To address the problem of permeability prediction in carbonate reservoirs, the authors have conducted rock typing study and thereby proposed a new modeling method using "double seismic constraint":build a rock type model and a porosity model constrained by seismic impedance respectively, and then get a final permeability model according to the porosity-permeability relationship corresponding to each rock type. The core of "double seismic constraint" is to establish the relationship between seismic impedance and pore throat radius of core samples, and thereby make the rock type model more accurate. It breaks the bottleneck that it is difficult for seismic impedance (continuous variable) to constrain rock type (discrete variable), then constrains pore throat radius (continuous variable) related to rock type instead, and converts it into rock type using Truncated Gaussian Function. It not only improves the prediction accuracy of rock type of any arbitrary point in space and thus permeability prediction accuracy as well, but also omits the complex procedure of predicting rock type of a well from its borehole log. It has been applied in two new wells, showing its high accuracy.

Key words: rock type, double seismic constraint, seismic impedance, reservoir modeling, permeability prediction

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