基于谱反演的超限厚储层描述技术及其在渤海海域“富砂型”极浅水三角洲储集层的应用  

Super-thick reservoir characterization technique based on spectral inversion and its application on extremely shallow sand-rich delta,Bohai sea

作　　者：周东红 张志军 谭辉煌 

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《中国海上油气》2015年第3期25-30,共6页China Offshore Oil and Gas

基　　金："十二五"国家科技重大专项"近海隐蔽油气藏勘探技术(编号:2011ZX05023-002)"部分研究成果

摘　　要：与传统极浅水三角洲沉积相比,渤海海域新近系"富砂型"极浅水三角洲沉积具有砂岩百分含量极高、砂体厚度范围更广的特点,特别是超限厚储层(厚度大于1/2视波长)大量发育,因此在海上稀疏井网条件下利用常规储层预测手段难以对该类储层进行准确描述。通过转变应用思路、改进反演流程和优选相对波阻抗计算方法,将谱反演技术应用到厚储层的研究中,提出了分步谱反演的新流程和本文的基于谱反演的超限厚储层描述技术,实现了对超限厚储层的精细刻画。该方法在渤海海域多个油田进行了成功应用,钻前预测结果得到多口钻井的证实,有效降低了勘探开发风险,可推广应用于其他类似地区。Compared to the traditional extremely shallow delta deposition, the extremely shallow sand-rich delta of the Neogene reservoirs in Bohai sea is characteristic of extremely high percentage of sandstone and wider range of sand body thickness, especially of more super-thick layers （the thickness of sand body is greater than half of apparent wavelength） existing, leading to that the reservoir is hard to be characterized accurately under the condition of sparse well patterns offshore by traditional reservoir description methods. Spectral inversion is applied to describe the thick reservoirs upon switching to a new approach, improving the inversion flow and optimizing the algorithms for calculating relative wave impedance~ and a new step- by-step workflow of spectral inversion and the super-thick reservoir characterization technique based on spectral inversion are presented, thus realizing the fine characterization of super-thick reservoirs. This method has been used successfully in several oilfields in Bohai sea, and its pre-drilling prediction results have been confirmed by several wells, which reduced the risk of exploration effectively, hence can be also applied in other areas.

关 键 词：谱反演 超限厚储层 “富砂型”极浅水三角洲 储层描述 渤海海域 

分 类 号：TE513.214[石油与天然气工程—油气田开发工程]