四川盆地仪陇-平昌地区二叠系长兴组地震沉积学研究  

Seismic Sedimentology of the Permian Changxing Formation in the Yilong-Pingchang Area, Sichuan Basin

作　　者：章学刚 邓庆杰[2] 熊冉 杨飞[2] ZHANG Xuegang;DENG Qingjie;XIONG Ran;YANG Fei(Energy College,Jingzhou University,Jingzhou,Hubei 434020;Yangtze University,School of Geosciences,Wuhan,Hubei 430100;PetroChina Hangzhou Research Institute of Geology,Hangzhou,Zhejiang 310023)

机构地区：[1]荆州学院能源学院,湖北荆州434020 [2]长江大学地球科学学院,湖北武汉430100 [3]中国石油杭州地质研究院,浙江杭州310023

出　　处：《地质与勘探》2023年第6期1347-1355,共9页Geology and Exploration

基　　金：长江大学工程技术学院科研基金(编号:2021KY04);“十三五”国家科技重大专项“塔里木、四川重点海相盆地沉积相研究”(编号:2016ZX05007-002);湖北省教育厅中青年人才项目(编号:Q20181306)联合资助。

摘　　要：为明确四川盆地仪陇-平昌地区二叠系长兴组地震相及沉积特征,运用地震岩性学和地震地貌学的综合分析技术,开展井-震结合及礁体三维识别研究,以阐明长兴组生物礁滩储集体的展布特征。研究结果表明,仪陇-平昌地区长兴组主要为四个沉积区带,开阔台地相对应平行-亚平行席状中弱断续地震相,台地边缘相对应平行-亚平行丘状或透镜状中弱地震相,台地前缘斜坡相对应前积席状弱地震相,海盆相对应平行-亚平行席状中强地震相,可细分为台缘礁,台内礁和台内滩亚相。30 Hz振幅调谐体切片揭示海盆岸线为北西向展布,25 Hz调谐体切片对于海盆线西侧的台缘带礁体和台内礁滩体反应明显。生物礁滩体的平面展布特征和发育规模受控于长兴组沉积期西南高、东北低的古地貌形态,台缘礁生长发育的有利区域为台地相带两排北西向凸起带。In order to determine the seismic facies and sedimentary characteristics of the Changxing Formation in the Yilong-Pingchang area of Sichuan Basin,this work employed comprehensive analytical techniques involving seismic lithology and seismic geomorphology,and integrated well data,seismic data,and three-dimensional identification of reef bodies to determine the distribution patterns of reef beach reservoirs within the Changxing Formation.The results indicate that the Changxing Formation in the Yilong-Pingchang area develops four sedimentary zones.Among them,the open platform facies corresponds to parallel-subparallel sheeted moderately weak and intermittent seismic facies.The platform marginal facies corresponds to parallel-subparallel mound or lens-shaped moderate-weak seismic facies.The platform foreslope facies corresponds to sheeted foreset weak seismic facies.The marine basin facies corresponds to parallel-subparallel sheeted medium-strong seismic facies,which can be subdivided into subfacies of platform margin reef,intra-platform reef and intra-platform shoal.The 30 Hz amplitude tuning body slice reveals that the shoreline of the basin is distributed in a northwest direction,while the 25 Hz amplitude tuning body slice has a clear response to the reef bodies in the platform margin,intra-platform reef,and intra-platform shoal subfacies in the west side of the basin.The planar distribution and development scale of biological reefs and shoals were controlled by the ancient geomorphic morphology of high in the southwest and low in the northeast during the sedimentary period of the Changxing Formation.The favorable areas for the growth and development of platform margin reefs are two rows of northwest-trending belts in the platform facies.

关 键 词：地震沉积学 地震分频技术 生物礁 长兴组 二叠系 仪陇-平昌地区 四川盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]