印模法古地貌恢复在岩溶丘滩相有利区评价中的应用:以川中古隆起北斜坡灯影组二段为例  

Application of Impression Method in the Restoration of Ancient Landforms for Favorable Areas Evaluation of Karst Shoal Facies:Taking the Second Member of Dengying Formation in the North Slope of Central Sichuan Paleouplift as an Example

作　　者：徐敏 巫芙蓉 彭才 臧殿光 杨晋蓉 罗伟 孙甫 董同武 崔青雯 XU Min;WU Fu-rong;PENG Cai;ZANG Dian-guang;YANG Jin-rong;LUO Wei;SUN Fu;DONG Tong-wu;CUI Qing-wen(Southwest Geophysical Research Institute,BGP,CNPC,Chengdu 610213,China;Research Institute of BGP,CNPC,Zhuozhou 072750,China)

机构地区：[1]东方地球物理公司西南物探研究院,成都610213 [2]东方地球物理公司研究院,涿州072750

出　　处：《科学技术与工程》2024年第15期6190-6198,共9页Science Technology and Engineering

基　　金：中国石油天然气集团公司重大科技专项(2016E-0603)。

摘　　要：四川盆地寒武系-震旦系裂陷槽东侧川中古隆起北斜坡灯影组二段岩溶丘滩相储层非均质性强,主控因素复杂,成为制约北斜坡地区下一步天然气勘探目标优选的关键因素。利用三维连片地震数据,基于最新探井钻井、测井等资料,创新思路,提出用灯影组沉积后期的岩溶地貌来刻画滩相储层有利区,把上覆地层沧浪铺底作为基准层,采用印模法进行微幅古地貌分析,刻画了灯二岩溶期地貌特征。在此基础上,精细研究了储层的地震响应特征,建立了地震相分类模式,利用波形分类方法进行岩溶丘滩相储层发育有利区预测。成果揭示灯二段岩溶丘滩相储层发育规律呈与侵蚀槽展布方向相同的北西-南东向展布,与实际钻井和地质认识一致。相较之常规用的残厚法,该方法更加考虑了沉积特征和地质规律,减少了地震预测的多解性,且可达到半定量预测效果,为古隆起北斜坡单斜构造背景下研究岩溶滩相储层有利区提供了有利指导。The reservoir heterogeneity of karst shoal facies in the second member of Dengying Formation on the northern slope of central Sichuan paleouplift on the east side of Cambrian-Sinian Aulacogen in the Sichuan Basin is strong,and the main controlling factors are complex,which become the key factors restricting the next step of targets optimization of natural gas exploration in the northern slope area.Using 3D seismic data and based on the latest exploration well drilling,logging and other data,innovative ideas were proposed to depict favorable area of beach facies reservoir using the karst landform of the lateral sedimentary period of Dengying Formation.The overlying strata,Canglang Formation,was used as the reference layer,and micro paleogeomorphic analysis was carried out using the impression method to characterize the geomorphic characteristics of Dengying Formation during the karst period.On this basis,the seismic response characteristics of the reservoir were carefully studied,and a seismic facies classification model was established.The waveform classification method was used to predict favorable areas for the development of karst shoal facies reservoirs.The results reveal that the development pattern of the karst shoal facies reservoir in the second member of Deng Formation follows a northwest to southeast direction similar to the distribution direction of the aulacogen,which is consistent with actual drilling and geological understanding.Compared to the conventional residual thickness method,this method takes more into account sedimentary characteristics and geological laws,the multiplicity of predictions is reduced,the semi-quantitative prediction can be achieved,and the favorable guidance for studying favorable areas for the development of karst shoal facies reservoirs in the context of monoclinic structures on the northern slope of paleouplifts is thus provided.

关 键 词：川中古隆起 岩溶丘滩相储层 古地貌恢复术 印模法 地震相分析技术 

分 类 号：P631.442[天文地球—地质矿产勘探]