摘要
塔里木盆地顺北地区7000 m超深层广泛发育碳酸盐岩断控岩溶储层,其复杂的溶洞-裂缝系统为油气提供了良好的运移通道和储集空间.本文分尺度精细刻画断控岩溶输导体系三维内部结构.首先采用断裂增强滤波技术,提高超深层地震数据信噪比.其次,根据断控岩溶输导结构的地震反射特征,将其划分为大、中、小三种不同尺度结构模式.大尺度结构包括大型走滑断裂、溶洞及伴随的岩溶塌陷,具有规则的断裂强反射和“串珠状”反射的震相特征;中尺度结构主要为走滑断裂附近横向发育的次生断层及伴随的岩溶局部塌陷,具有杂乱强反射震相特征;小尺度结构为弥漫整个输导介质的背景裂缝,具有杂乱弱反射震相特征.单一的地震属性很难全面地描述断控岩溶输导介质,通过属性分析,明确了三类结构模式的敏感地震属性群,利用贝叶斯聚类融合技术,分别对三类结构模式的敏感地震属性群进行融合.最后,将三类结构模式的融合地震属性分别采样到三维输导介质网格中进行量化分析,最终建立缝洞连通体结构模型,为后续的岩性物性预测和流体识别提供三维输导体系连通体模型.
The 7000-meter ultra-deep carbonate fault-controlled karst reservoir in the Shunbei area of Tarim Basin provides a good transport channel and reservoir space for oil and gas.In this paper,the three-dimensional internal structure of the fault-controlled karst conduction system is finely depicted at different scales.Firstly,fracture-enhanced filtering technology is used to improve the signal-to-noise ratio of ultra-deep seismic data.Secondly,according to the seismic reflection characteristics of the fault-controlled karst conduction structure,it is divided into three different scale structural modes:large,medium,and small.The large-scale structure includes large strike-slip faults,karst caves and accompanying karst collapses,with regular fracture strong reflection and“beaded”reflection seismic facies characteristics.The mesoscale structure is mainly a secondary fault that develops laterally near the strike-slip fault and the accompanying karst local collapse,which has the characteristics of chaotic strong reflection seismic facies.The small-scale structure is a background crack that disperses the entire conduction medium,which has the characteristics of chaotic and weak reflection seismic facies.It is difficult to comprehensively describe the fault-controlled karst conduction medium with a single seismic attribute.Through attribute analysis,the sensitive seismic attribute groups of the three types of structural patterns are clarified.The sensitive seismic attribute groups of the three structural modes are fused by Bayesian clustering and fusion technology.Finally,the seismic attributes fusion of the three types of structural models are sampled into the three-dimensional conduction medium grid for quantitative analysis.Finally,the fracture-cavity connected structure model is established,which provides a three-dimensional transmission system connectivity model for subsequent lithology prediction and fluid identification.
作者
王志伟
符力耘
刘军
蔡忠贤
WANG ZhiWei;FU LiYun;LIU Jun;CAI ZhongXian(Shandong Provincial Key Laboratory of Deep Oil and Gas,Qingdao 266580,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China;School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China;Research Institute of Exploration&Production,SINOPEC Northwest Company,Urumqi 830011,China;School of Earth Resource,China University of Geoscience,Wuhan 430074,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第1期83-94,共12页
Chinese Journal of Geophysics
基金
中国科学院A类战略性先导科技专项(XDA14010303)
山东省自然科学基金(ZR2021QD040)
中国博士后科学基金(2021M703582)联合资助.
关键词
碳酸盐岩断控岩溶输导介质
地震属性
反射震相分析
贝叶斯聚类
连通性分析
Carbonate fault-controlled karst conduction medium
Seismic attribute
Reflected seismic facies analysis
Bayesian clustering
Connectivity analysis
