基于优化MCMC算法的地震弹性阻抗反演方法  

Elastic impedance inversion method of seismic data based on optimized MCMC algorithm

作　　者：赵晨[1] 郭淑文[1] 金凤鸣[1] 韩国猛[1] 于超[1] 邢兴[1] 国春香[1] 周淑慧[1] ZHAO Chen;GUO Shuwen;JIN Fengming;HAN Guomeng;YU Chao;XING Xing;GUO Chunxiang;ZHOU Shuhui(Dagang Oilfield Company,PetroChina,Tianjin 300280,China)

机构地区：[1]中国石油大港油田公司,天津300280

出　　处：《矿产与地质》2023年第3期587-596,共10页Mineral Resources and Geology

基　　金：中国石油天然气股份有限公司重大科技专项(编号:2018E-11);中央高校基本科研业务费专项资金资助项目(18CX06020A);大港油田博士后项目“致密砂岩储层甜点地震预测技术与应用”共同资助。

摘　　要：以地震反演为核心的地震物探技术能够有效利用地震数据实现地下储层参数的有效预测,为油气勘探提供必要的参数支撑。弹性阻抗反演采用叠前角度部分叠加道集,不仅可以较好地反映地层岩性和流体特征,且具有较强的抗噪能力。而马尔可夫链蒙特卡洛(MCMC)算法是一种常见的随机反演方法,可以得到可靠的参数估计和反演结果的不确定性信息,对于地下优质薄储层的识别具有一定的优势。但当参数空间较为复杂时,MCMC算法常常不能进行充分搜索,且收敛速度较慢。针对该问题,本文提出了一种调节算法接受概率的方法,提高了MCMC算法的计算效率和稳定性,并将其应用于弹性阻抗反演。模型测试结果与实际数据应用结果表明了该反演方法的可靠性,且与确定性反演相比具有较高的分辨率。The seismic geophysical exploration technology with seismic inversion as the core can effectively use seismic data to predict the parameters of underground reservoir and provide necessary parameter support for oil and gas exploration.The elastic impedance inversion based on the partial angle stack seismic data can reflect the lithology and fluid characteristics of stratum and has strong anti-noise ability.Markov Chain Monte Carlo(MCMC)method is widely used in stochastic inversion at present and can obtain the uncertain information and the reliable parameter estimation.It has some advantages for the identification of underground high quality thin reservoirs.However conventional MCMC method has some limits.For the more complex parameter space,MCMC algorithm cannot search fully,and the speed of convergence is slow.This paper improves conventional MCMC method by adjusting acceptance probability of algorithm.The elastic impedance inversion method based on improved MCMC algorithm is developed in this paper.The model test and actual data application show that the inversion method can effectively acquire the results of elastic impedance,and has high resolution compared with deterministic inversion.

关 键 词：地震随机反演 弹性阻抗反演 MCMC算法 优化MCMC算法 

分 类 号：P631.4[天文地球—地质矿产勘探]