Application of multi-component joint inversion in oil and gas exploration:A case study of reservoir and gas saturation prediction of the Xujiahe formation in the PLN area of the central Sichuan Basin  

多波联合反演在川中油气探测中应用-以PLN地区XJH组储层预测及含气性检测为例

作　　者：Wang Dong He Zhen-Hua Wang Xu-Ben Li Le Yang Hai-Tao Fu Zhi-Guo Wang Hong-Yan 王栋;贺振华;王绪本;李乐;杨海涛;符志国;王鸿燕(成都理工大学地球物理学院,四川成都610059;中国石油天然气集团公司东方地球物理勘探有限责任公司,河北涿州072750;中国石油天然气集团公司山地地震技术试验基地,四川成都610213)

机构地区：[1]The college of geophysics,Chengdu University of Technology,Chengdu 610059,China [2]BGP Inc.,China National Petroleum Corporation,Zhuozhou 072750,China [3]Mountain Geophysical Technology Test Center,CNPC Chengdu 610213,China

出　　处：《Applied Geophysics》2020年第5期879-889,905,共12页应用地球物理（英文版）

基　　金：This work was supported by“Thirteenth Five-Year”national science and technology major Project(No.2017ZX05018005-004);CNPC fundamental research project(No.2016E-0604);National Natural Science Foundation of China(No.41374111).

摘　　要：Multi-component seismic exploration is an important technique in the utilization of P-waves and converted S-waves for oil and gas exploration.It has unique advantages in the structural imaging of gas zones,reservoir prediction,lithology,and gas-water identifi cation,and the development direction and degree of fractures.Multi-component joint inversion is one of the most important steps in multi-component exploration.In this paper,starting from the basic principle of multi-component joint inversion,the diff erences between the method and single P-wave inversion are introduced.Next,the technique is applied to the PLN area of the Sichuan Basin,and the P-wave impedance,S-wave impedance,and density are obtained based on multi-component joint inversion.Through the velocity and lithology,porosity,and gas saturation fi tting formulas,prediction results are calculated,and the results are analyzed.Finally,multi-component joint inversion and single P-wave inversion are compared in eff ective reservoir prediction.The results show that multi-component joint inversion increases the constraints on the inversion conditions,reduces the multi-solution of a single P-wave inversion,and is more objective and reliable for the identification of reservoirs,effectively improving the accuracy of oil and gas reservoir prediction and development.多波地震勘探是一项综合利用纵波和转换横波开展油气勘探的重要技术,在含气区的构造成像、储层预测、岩性及气水识别、裂缝发育方向及程度预测等方面具有独特优势。其中,多波联合反演是多波勘探中的重要环节之一。本文从多波联合反演的基本原理出发,介绍了其方法与单一纵波反演的不同之处,并将该技术应用于四川盆地川中PLN地区,获得了基于多波联合反演的纵波阻抗、横波阻抗及密度。通过该地区的速度与岩性、孔隙度,以及与含气饱和度拟合公式计算得到岩性识别、孔隙度和含气饱和度预测结果,并进行了效果分析。最后,将多波联合反演与单一纵波反演在有效储层预测方面进行了效果对比。结果表明,多波联合反演由于增加了对反演条件的约束,因此降低了单一纵波反演的多解性,能够更加客观可靠地进行储层识别,有效提高油气储层预测及开发的准确性。

关 键 词：multi-component joint inversion lithology identifi cation POROSITY gas saturation reservoir prediction 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]