摘要
四川盆地生物礁识别基本形成了从有利相带、生物礁地震反射特征分析到礁体刻画的成熟模式。但最近几年,不论是以生物礁为钻探目标的探井还是开发井,频频出现钻探失误,需进行侧钻才能钻到目标靶点。为解决这一问题,在对生物礁的地质特征分析研究的基础上,指出生物礁礁前、礁后及礁翼岩性具有各向异性,据此可利用地震叠前数据,按不同方位角进行叠加,分析不同方位角叠加剖面地震反射特征,预测有利相带和生物礁。研究证明,不同方位角叠加剖面比全叠加剖面更能有效反映有利相带和生物礁地质目标的各向异性特征特性,更准确地预测有利相带和生物礁的分布,提高生物礁钻探成功率。以此指导从不同的角度去研究台缘带和生物礁的地震反射特征,突破原有的单纯从偏移剖面分析台缘带、礁前和礁后地震反射特征的方法,提高了生物礁识别的可靠性和准确性。
In Sichuan basin,the organic reef recognition has basically formed a mature mode from favorable facies belt,organic reef seismic reflection analysis to reef body characterization.However,in recent years,no matter the exploration wells or development wells with organic reef as the drilling target,there has been frequent drilling error,which requires sidetracking to reach the target.In order to solve this issue,on the basis of the analysis and study of the geological characteristics of the reefs,it is pointed out that the lithology of the front reef,back reef and reef flank is anisotropic.According to this,the seismic pre-stack data can be used to stack according to different azimuth,analyze the seismic reflection characteristics of different azimuth stack sections,and predict favorable facies belt and organic reefs.The results show that different azimuthal stacking profiles can reflect the anisotropic characteristics of favorable facies belt and reef geological targets more effectively,predict the distribution of favorable facies belt and reefs more accurately than full stacking profiles,and improve the success rate of reef drilling.The above basis can provide guidance for the study of the seismic reflection characteristics of the platform margin and organic reef from different perspectives,so as to break through the original method of simply analyzing the seismic reflection characteristics of the platform margin,front reef and back reef from the offset profile,and improve the reliability and accuracy of reef identification.
作者
黄平
罗韧
李欢
Huang Ping;Luo Ren;Li Huan(Petro China Southwest Oil&Gas Field Company.Exploration and Development Institute,Chengdu,Sichuan,610051,China;Petro China Southwest Oil&Gas Field Company.Northeast Sichuan Mine,Dazhou,Sichuan,635000,China)
出处
《天然气与石油》
2020年第2期61-67,共7页
Natural Gas and Oil
基金
中国石油天然气股份有限公司重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用-四川盆地碳酸盐岩地球物理关键技术研究与应用”(2016 E-0604)
中国石油天然气股份有限公司重大科技专项“川东地区天然气勘探开发关键技术研究与应用-川东地区中~深层油气勘探地球物理技术攻关研究”(2016 ZD 01-02)。
