建南地区上二叠统长兴组生物礁地震沉积学  

Study of Seismic Sedimentology of Upper Permian in Changxing Formation in Jiannan Area

作　　者：杨巍[1,2] 胡明毅[1,2] 高炎 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [2]长江大学地球科学学院,湖北武汉430100 [3]中国石油新疆油田,新疆克拉玛依834000

出　　处：《现代地质》2014年第4期806-816,共11页Geoscience

基　　金：国家自然科学基金项目(41372136);教育部博士点基金项目(20124220110004);国家重大科技专项(2011ZX05007-002-001)

摘　　要：建南地区二叠系长兴组时期沉积相平面展布一直存在较大争议,严重制约生物礁滩发育区带预测。在实际研究中,以碳酸盐岩沉积理论为指导,运用地震沉积学研究思路与方法,利用单井资料对地震相反射特征进行地质意义解析,建立沉积相地震识别模式,并且运用古地貌恢复、属性分析等技术进行沉积相平面分布与演化分析。研究结果表明:生物礁井震结合进行层序标定后,地震相位特征能够较好地反映生物礁滩发育期次;结合地震剖面相与平面相识别,在研究区中部主要为低频、弱振幅反射的陆棚相,能够说明开江-梁平陆棚延伸到研究区;地震多属性分析能够较为真实地对沉积相边界与生物礁滩分布范围进行刻画;等时地层切片反映出三级层序SQ1后期为生物礁主要发育时期,SQ2时期海平面变浅,暴露滩体发育部位产生迁移。Sedimentary facies planar distribution of the Permian Changxing Formation,in Jiannan area,has been a considerable controversy,which seriously restricted prediction of reef and beach development zone.In the actual research,based on carbonate sedimentary theory,using the research ideas and methods of seismic sedimentology,by single well data information,reflection characteristics of seismic facies are analyzed in the perspective of geological significance,seismic recognition modes of sedimentary facies are established,and sedi-mentary facies distribution and evolution are analyzed by palaeogeomorphology reconstruction and attribute analysis.The results show that：By combining well and seismic,conducted calibration sequence of reef,the features of seismic phase can well reflect the reef and bank development periods.Combined seismic profile with planar facies identification,in the middle of the research area mainly developed continental shelf,which were with low frequency and low amplitude reflection that can be explained that the Kaijiang-Liangping shelf has ex-tended to the study area.The seismic multiple attributes analysis can describe actual boundary of sedimentary facies and reef distribution range.Isochronous stratigraphic sections reflect that the late three-order SQ1 period is mainly reefs development period.In the SQ2 period,sea level became shallow and development site of ex-posed shoal areas migrated.

关 键 词：地震沉积学 长兴组 生物礁 地质解译 古地貌 

分 类 号：TE121.3[石油与天然气工程—油气勘探] P618.130.2[天文地球—矿床学]