不同期次浊积扇体地震沉积学研究——以车西洼陷缓坡带车40-44块沙三上亚段为例  

Seismic Sedimentology Research on Turbidite Fan Body of Different Stages:In case of the Gentle Slope Belt of Chexi Depression's Che40-44 Area of Upper Submember of Es_3

作　　者：栗宝鹃[1,2] 董春梅 林承焰[1,2] 程俊阳 任丽华[1,2] 郭威 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]山东省油藏地质重点实验室,山东青岛266580 [3]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《吉林大学学报（地球科学版）》2016年第1期65-79,共15页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金青年基金项目(41202092)~~

摘　　要：以车西洼陷缓坡带车40-44块沙三上亚段为例,针对研究区浊积扇体"单期厚度难辨、纵向多期叠置,单个形态难识、横向顺势延展"的特点,在井震标定和分频解释共同确定的等时层序地层界限之内,以沉积相模式为指导,采用地震相分析与地层属性切片相结合的方法,对浊积扇体的横向展布形态和纵向演化规律进行描述和刻画,由此达到对不同期次浊积扇体进行精确识别和精细描述的目的。在研究过程中,主要形成以下几点认识:1Es31和Es34期次顶、底界限由井震结合标定,其等时性可利用分频解释技术确定;2根据地震相的分布位置及特点,发现浊积扇体均分布于同沉积断层下降盘,且"纵向叠置、横向迁移";3通过地层切片与均方根振幅属性相结合分析,刻画出不同期次浊积扇体横向上受地势影响、呈裙带状分布的规律,和纵向上自下而上扇体数量增多且连续性增强的变化规律。Taking the gentle slope belt of Chexi depression＇s Che40 -44 area of Upper Submember of Esa as an example, the authors study a set of methods for identifying and describing different stages of turbidite fans based on seismic sedimentology. The turbidite fan body of the studied area has suchcharacteristics as ＂single stage is difficult to identify for its thickness, as it is overlapped vertically with many others~ single fan body is difficult to identify for its shape, as it extends horizontally with many others together＂. In the limit of chorostratigraphy which is determined by well and seismic combined calibration and frequency-division interpretation, and under the guidance of sedimentary facies model, a method combined with seismic facies analysis and horizontal attribute slices is used to describe the shape of turbidite fan body, and to summarize the longitudinal evolutionary pattern of fans, so that the turbidite fan of different stages are precisely identified and described. Following conclusions can be drawn from this research. 1）the top and bottom boundaries of Esal and Esa4 can be calibrated by well and seismic data in combination, and its isochroneity can be determined by the spectral decomposition interpretation technique; 2）according to the distribution and characteristics of seismic facies, it can be found that all turbidite fan bodids locate in the descending stage of the contemporaneous fault, and they are usually overlapped in vertical and shifted in horizon; 3）by analyzing the strata slices and mean root of seismic waveform amplitude, evolutionary law of turbidite fans of different stages can be drawn that they are prone to be affected by terrains and spread like ribbons in horizon,and number of fans increases and continuity enhances from top to bottom in vertical.

关 键 词：浊积扇 地震沉积学 地震相 地层切片 期次划分 车西洼陷 

分 类 号：P588.2[天文地球—岩石学] P631.4[天文地球—地质学]