川中北部蓬莱地区震旦系灯影组二段地震沉积学特征  

Seismic sedimentology characteristics of the second member of Sinian Dengying Formation in Penglai area,north-central Sichuan Basin

作　　者：张坤[1,2,3] 刘宏 谭磊[1,2,3] 梁锋 王立恩 马梓珂 刘博文 杨孟祥 ZHANG Kun;LIU Hong;TAN Lei;LIANG Feng;WANG Lien;MA Zike;LIU Bowen;YANG Mengxiang(Sichuan Natural Gas Geology Key Laboratory,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Southwest Petroleum University,Chengdu 610500,China;CNPC Key Laboratory of Carbonate Reservoirs Southwest Petroleum University Division,Chengdu 610500,China;North Central Sichuan Gas Production Management Office,PetroChina Southwest Oil and Gas Field Company,Suining 629000;Chuanzhong Division of PetroChina Southwest Oil&Gasfield Conpany,CNPC,Suining 629000,Sichuan,China)

机构地区：[1]西南石油大学天然气地质四川省重点实验室,成都610500 [2]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [3]中国石油碳酸盐岩储层重点实验室西南石油大学研究分室,成都610500 [4]中国石油西南油气田公司川中北部采气管理处,四川遂宁629000 [5]中国石油西南油气田公司川中油气矿,四川遂宁629000

出　　处：《岩性油气藏》2025年第2期189-200,共12页Lithologic Reservoirs

基　　金：中国石油—西南石油大学创新联合体科技合作项目“深层/超深层碳酸盐岩天然气勘探开发基础理论与关键技术研究”(编号:2020CX010000)资助。

摘　　要：为了阐明蓬莱地区震旦系灯二段丘滩体的时空展布规律以及探索地震沉积学在碳酸盐岩中的应用,利用钻井、岩心、测井及三维地震资料,采用古地貌恢复、正演模拟、波形聚类、属性融合等地震沉积学技术方法对蓬莱地区震旦系灯二段丘滩体进行了识别与刻画。研究结果表明:①四川盆地蓬莱地区震旦系灯二段沉积期,蓬莱地区整体表现为碳酸盐岩台地沉积,可分为丘滩复合体、丘滩间海、台坪、局限潟湖等4种沉积亚相。②通过地震-岩性精细标定,建立了地震相与沉积相带间的良好对应关系,其中高能丘滩相带在地震剖面上表现为低幅丘状外形、内部杂乱或断续—弱断续反射、内幕核部亮点反射特征。基于地震相约束下的主成分分析(PCA)多属性融合技术可以有效地提升丘滩复合体识别精度。③灯二段丘滩分布具有分区分带的特点,磨溪地区SQ1沉积期丘滩较蓬莱地区发育,至SQ2沉积期,蓬莱地区丘滩发育规模变大,滩核微相发育范围广,而磨溪地区以台坪沉积为主,丘滩仅在局部零星发育。In order to clarify the temporal and spatial distribution of the mound-shoal complex of the second member of Dengying Formation(Deng 2 member for short)in Penglai area and explore the application of seismic sedimentology in carbonate rocks,the mound-shoal complex of Deng 2 member in Penglai area were identified and characterized by seismic sedimentology techniques such as paleogeomorphology restoration,forward modeling,waveform clustering and attribute fusion based on drilling,core,logging and 3D seismic data.The results show that:(1)During the sedimentary period of Deng 2 member,Penglai area is characterized by carbonate platform deposition,and can be subdivided into four sedimentary subfacies:mound-shoal complex,intershoal sea,platform flat and restricted lagoon.(2)Through fine seismic-lithologic calibration,a good correspondence between seismic facies and sedimentary facies is established.The high-energy mound-shoal complex face is characterized by low-amplitude mound-like shape,internal disorder or intermittent-weak intermittent reflection,and bright spot reflection in the inner core.PCA multi-attribute fusion technology based on seismic facies constraints can effectively improve the recognition accuracy of mound-shoal complex.(3)The distribution of mound-shoal complex in the Deng 2 member has the characteristics of differentiation zone.The mound-shoal complex in the SQ1 sedimentary period of the Moxi area are more developed than those in the Penglai area.Until SQ2 sedimentary period,the development scale of the mound-shoal in the Penglai area has become larger,and the moundshoal complex core microfacies have a wide range of development.The Moxi area is dominated by platform sediments,and the mound-shoal complex are only sporadically developed in local areas.

关 键 词：丘滩复合体 地震沉积学 多属性分析 低幅丘状 杂乱反射 亮点反射 灯影组二段 震旦系 蓬莱地区 四川盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P631.4[天文地球—地质矿产勘探]