摘要
等效流体体积模量是一种较为敏感的流体指示因子,在复杂储层的含油气识别中具有重要意义,但仅利用纵波资料AVO反演Gassmann流体因子进行流体识别时存在精度低、多解性强,边界刻画不清晰等问题,制约了其在流体识别中的应用。依据双相介质岩石物理模型,首先推导了新的由等效流体体积模量、岩石骨架剪切模量和孔隙度组成的PP波和PS波Zoeppritz线性近似方程,然后结合PP波和PS波数据,在贝叶斯理论和柯西先验分布约束下进行同步联合反演。Marmousi2油藏模型测试结果表明:与仅利用PP波的反演方法相比,基于独立PP波与PS波的同步联合反演方法更加稳定,反演精度更高,地质体边界特征刻画也更清晰,A油田实例工区应用进一步证明了该方法的可行性与鲁棒性。本文提出的纵横波同步联合反演方法对提高储层流体识别有一定的可借鉴性。
Equivalent fluid bulk modulus is a sensitive fluid indicator,which is of great significance in hydrocar‐bon identification of complex reservoirs.However,conventional single P wave AVO inversion method for fluid identification using Gassmann fluid factor has problems including poor precision,multi-solution,and ambiguous description of geological boundaries,which restricts the applications of these techniques in fluid identification.Based on rock physical model of two-phase medium,a new linear approximation of PP wave and PS wave Zoep‐pritz equation which consists of equivalent fluid bulk modulus,shear modulus of rock skeleton and porosity-related gain was derived firstly.Then,simultaneous joint inversion was carried out under the constraint of Baye-sian theory and Cauchy prior distribution with the combination of PP wave and PS wave data.The test results of Marmousi2 reservoir model show that compared with the inversion methods merely using PP wave data,simulta‐neous joint inversion based on independent PP wave and PS wave can provide more stable inversion results,higher accuracy and clearer description of geological boundary characteristics.The application in A oilfield proved the feasibility and robustness of this method.The proposed PP and PS wave simultaneous joint inversion method has certain reference for improving reservoir fluid identification.
作者
丁燕
杜启振
刘力辉
符力耘
冷雪梅
刘子煊
DING Yan;DU Qizhen;LIU Lihui;FU Liyun;LENG Xuemei;LIU Zixuan(Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,Shandong,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266580,Shandong,China;Beijing Rock Star Petroleum Technology Co.,Ltd.,Beijing 100083,China;Sinopec International Petroleum Exploration and Production Corporation,Beijing 100029,China)
出处
《岩性油气藏》
CSCD
北大核心
2020年第1期111-119,共9页
Lithologic Reservoirs
基金
中国科学院战略性先导专项（XDA14010303）
高等学校学科创新引智计划（“111计划”）“致密油气地质与勘探创新引智基地、深层—超深层油气地球物理勘探创新引智基地”联合资助
关键词
同步联合反演
流体识别
等效流体体积模量
剪切模量
孔隙度
simultaneous joint inversion
fluid identification
equivalent fluid bulk modulus
shear modulus
porosity
