基于分频RGB融合技术的储层构型精细解剖——以东海盆地西湖凹陷渐新统花港组为例  

Fine anatomy of reservoir architecture based on frequency division RGB fusion technology:A case study of the Oligocene Huagang Formation in Xihu Depression,East Sea Basin

作　　者：杨民鑫 赵晓明[1,2] 梁岳立 阴国峰 王健伟 葛家旺[1,2] 胡成军 严曙梅 潘潞[3] YANG Minxin;ZHAO Xiaoming;LIANG Yueli;YIN Guofeng;WANG Jianwei;GE Jiawang;HU Chengjun;YAN Shumei;PAN Lu(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;Sichuan Key Laboratory of Natural Gas Geology,Chengdu 610500,China;China Petroleum and Chemical Corporation Shanghai Offshore Oil and Gas Branch,Shanghai 200000,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]天然气地质四川省重点实验室,四川成都610500 [3]中国石油化工股份有限公司上海海洋油气分公司,上海200000

出　　处：《天然气地球科学》2024年第7期1323-1338,共16页Natural Gas Geoscience

基　　金：国家自然科学基金项目(编号:41872142,42072183);中国石油化工股份有限公司上海海洋油气分公司项目“黄岩1-1复杂河道储层构型研究”(编号:34000000-22-ZC0613-0015)联合资助。

摘　　要：H5b小层是东海盆地西湖凹陷黄岩构造渐新统花港组目前的主力产气层,发育辫状河三角洲前缘亚相沉积,由于单一河道间的复杂叠置关系,导致储层非均质性和砂体动用情况复杂,当前对砂体间连通性的认识不足,亟需对H5b小层进行储层构型精细表征。常规地震属性分析技术往往多解性强,因而通过分频优选与RGB融合、储层构型模式指导、动态响应特征约束等手段,对研究区4、5级构型单元进行了精细表征。结果表明:①在海上稀井网条件下,分频RGB融合技术相比常规地震属性分析技术而言,混色显示的颜色差异与亮度变化使河道砂体边界和砂体厚度分布更加连续清晰,对构型单元的识别精度有显著提升,通过井震结合、水平井信息和平剖互动,佐证了其对于构型边界位置的识别精度达到了30 m以内。②将H5b小层分频优选出的23、35、60 Hz 3个单频数据体进行RGB融合,在该分频组所对应RGB颜色响应的有效砂厚区间内,响应砂厚与测井解释砂厚相关性高,R=0.7999。③利用分频RGB融合技术在相沉积模式和构型模式的指导下,结合动态资料,在研究区内划分出5条5级复合河道构型边界,复合河道构型单元宽1000~3000 m,厚15~80 m;4级单一河道构型单元宽150~800 m,定性表征独立型和叠加型4级单一河道构型边界为不连通性边界,切叠型4级单一河道构型边界为半连通性边界。通过分频RGB融合技术精细刻画了研究区4级和5级构型边界,分析了不同构型边界的连通性特征,为该类气藏的剩余气高效开发提供了理论借鉴及技术支撑。The H5b sandstone reservoir in the Xihu Depression of East Sea Basin is the current main gas-produc⁃ing layer of the Huangyan Structure in the Gradual New Period of the Huagang Formation.It deposits in the subfacies of a braided river delta front,and due to complex overlapping relationships within single river chan⁃nels,it exhibits reservoir heterogeneity and complex sand body utilization patterns.There is currently a lack of understanding of the connectivity between sand bodies in the H5b formation,making it essential to provide a de⁃tailed characterization of the reservoir configuration.Conventional seismic attribute analysis techniques often have high ambiguity.Therefore,through methods such as frequency-based selection and RGB fusion,reservoir configuration modeling guidance,and dynamic response feature constraints,a refined representation of the 4th and 5th order configuration units in the study area was conducted.The results indicate:(1)Under sparse off⁃shore well networks,the frequency-based RGB fusion technique,compared to conventional seismic attribute analysis techniques,provides a more continuous and clear display of river sand body boundaries and sand body thickness distribution through color variations and brightness changes.This significantly improves the accuracy of identifying configuration units,with recognition accuracy of configuration boundary positions within 30 me⁃ters,supported by well-seismic integration,horizontal well information,and cross-section interaction.(2)By combining the 23 Hz,35 Hz,and 60 Hz single-frequency data volumes selected by frequency,RGB fusion can intuitively display the distribution of sand body thickness and boundaries of different configuration units.Within the effective recognition range of sand body tuning thickness in frequency-based RGB fusion,there is a high cor⁃relation(R=0.7999)between RGB color response and log interpretation sand thickness.(3)Using the fre⁃quency-based RGB fusion technique guided by facies and configuration models,combined wit

关 键 词：分频RGB融合技术 储层构型 连通性 花港组 西湖凹陷 

分 类 号：TE132.1[石油与天然气工程—油气勘探]