松南梨树断陷高精度地震层序及地震沉积相识别  

High resolution seismic sequence and seismic sedimentary facies in Lishu fault depression of southern Songliao Basin

作　　者：宫雪[1,2] 沈武显[2] 逄海明 

机构地区：[1]西北大学地质学系、大陆动力学国家重点实验室,陕西西安710069 [2]西安石油大学地球科学与工程学院,陕西西安710065 [3]中石化东北油气分公司勘探开发研究院,吉林长春130062

出　　处：《中南大学学报（自然科学版）》2014年第5期1566-1573,共8页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2011ZX05005-004-008HZ)

摘　　要：依据地震反射波终止关系,在研究区地震剖面识别出基岩顶面、地层侵蚀不整合面、地层超覆不整合面、地层平行不整合面这4种地震层序界面,将断陷层地震单元划分为5个地震层序（SQ1~SQ5）,从而建立梨树断陷高精度地震层序地层格架。以外部几何形态、内部反射结构、振幅、连续性、频率、波形和层速度等参数为依据,在研究区内共识别出弱振幅中连续亚平行、中振幅好连续平行、中振幅中连续乱岗状、中振幅好连续上超充填、强振幅差连续杂乱、叠瓦状前积、楔状体、侵蚀河道、丘形共9种反射地震相类型。结合三维地震属性（均方根振幅和平均能量）分析,以较高的精度和合理性分析区域地震沉积相分布规律。研究结果表明：各层序体系地震沉积相分布既具有北部、东南部物源在各时期相对稳定且持续发育的明显继承性,又存在其空间展布范围此消彼长的阶段性特点。Based on the termination relationship between seismic reflection, the top surface of bedrock, the strata erosional unconformity surface, the strata overlying unconformity surface and the strata parallel unconformity surface on the seismic profiles of the study area were identified. The rift formations were divided into five seismic sequence units（SQ1-SQ5）, and the Lishu rift high precision seismic sequence stmtigraphic framework was established. According to the external geometry, internal reflection structure, amplitude, continuity, frequency, waveform, velocity and other parameters, nine seismic facies types were identified in the study area including weak amplitude-medium continuous- sub-parallel type, medium amplitude-well continuous-parallel type, medium amplitude- medium continuous-messy state type, medium amplitude-well continuous-ultra filling type, strong amplitude-poor continuous-messy state type, imbricated forward accretion type, wedge type, erosional watercourse type and hummocky type. Combined with three-dimensional seismic attributes （root mean square amplitude and average energy） the regional seismic sedimentary facies distribution were analysed with high accuracy and reasonableness. The results show that in each sequence system of seismic sedimentary facies, the northern and southeastern sources are stable and sustain significant inheritance during each period, and the spatial distribution range own shifting periodic features.

关 键 词：梨树断陷 断陷层 地震层序 地震沉积相 

分 类 号：TE121[石油与天然气工程—油气勘探]