基于倾角属性的三维地应力场分析方法  

A 3D stress field analysis method based on dip attributes

作　　者：熊晓军[1] 崔泽飞[1] 巫芙蓉 龚思宇 李翔[1] 刘阳[1] 

机构地区：[1]成都理工大学油气藏地质与开发工程国家重点实验室,四川成都610059 [2]中国石油川庆钻探工程公司地球物理勘探公司,四川成都610213

出　　处：《中国海上油气》2018年第1期62-66,共5页China Offshore Oil and Gas

基　　金："十三五"国家科技重大专项"基于地应力分析的页岩工程甜点预测分析技术(编号:2016ZX05023-004-001-003)"部分研究成果

摘　　要：常规基于二维面曲率的应力场计算方法会受到目的层层位解释精度的影响,为了克服这一缺陷,提出了一种基于倾角属性的三维地应力场分析方法,将"曲率-应变-应力"方程变形为"倾角-应变-应力"方程,实现了通过地层倾角计算地应力。该方法首先采用离心窗倾角扫描方法计算三维地震数据体的倾角,再基于倾角属性计算目的层段的体曲率,最后采用"曲率-应变-应力"方程计算目的层段的三维地应力场。该方法借用了三维体曲率分析的思路,直接针对三维地震数据体进行计算,有效克服了常规方法受层位解释精度影响的缺陷。渤海某工区花岗岩储层实际资料的计算结果表明,本文方法的预测结果与测井解释的一致性较好,可以有效地应用于研究区的裂缝预测,具有一定的推广意义。The conventional stress field calculation method based on 2D surface curvature is limited by the interpretation accuracy of target layer. To overcome this defect, this paper proposed a 3D stress field anal-ysis method based on dip attributes, in which the “ curvature-strain-stress” equation is transformed into a “ dip-strain-stress” equation. This method can calculate the field stress through the strata dip. Firstly, this method applies the dip scan method with eccentric window to calculate the dip angle of the 3D seismic data body; then calculate the volumetric curvature of the target formation based on the dip attributes, and final-ly calculate the 3D stress field of the target formation with the “ dip-strain-stress” equation. This method applies the concept of 3D volumetric curvature analysis and directly calculates the 3D seismic data body, thus effectively overcoming the defects of conventional method limited by the formation interpretation nccuracy. The calculation results of granite reservoirs in some work area of Bohai sea show that the predic-tion results of this method are in good conformity with well log interpretation and can be effectively applied to the prediction of fractures in the study area, which has some promotion significance.

关 键 词：地应力场 倾角 体曲率 储层预测 心窗倾角扫描 

分 类 号：P631.4[天文地球—地质矿产勘探]