南海深水海盆沉积物压实作用及影响因素  

SEDIMENT COMPACTION IN DEEPWATER BASIN OF SOUTH CHINA SEA AND EFFECTING FACTORS

作　　者：谢杨冰 吴时国[3] 

机构地区：[1]中国科学院海洋地质与环境重点实验室中国科学院海洋研究所,青岛266071 [2]中国科学院大学,北京100049 [3]中国科学院深海科学与工程研究所,三亚572000

出　　处：《海洋地质与第四纪地质》2017年第3期37-46,共10页Marine Geology & Quaternary Geology

基　　金：国家科技部973项目"海洋深水油气安全高效钻完井基础研究"子课题"深水钻井浅层地质灾害形成机理及预测方法"(2015CB251201)

摘　　要：深水盆地沉积物的压实作用直接关系到沉积物本身的稳定性,沉积物压实不均衡可能引发严重的深水地质灾害,如海底滑坡、浅层气、浅水流等,同时对钻井工程也会造成严重影响,如出现井漏、井喷,甚至引发平台不稳定至坍塌。选取了南海深水盆地ODP184航次1144、1146、1148站位与IODP349航次U1431、U1432、U1433、U1435站位的测井数据进行分析,获得了南海深水盆地沉积物正常压实系数与沉积物组分、沉积速率、沉积物埋深等多个影响因素的关系,初步建立起南海深水盆地不同深度沉积物正常压实系数与初始孔隙度的变化规律。为今后研究南海深水盆地地质灾害,特别是超压地质灾害提供参考。The stability of sediments is closely related to sediment compaction in deepwater basins. Facts suggest that uneven compaction of sediments may trigger serious geodisasters in deepwater, such as submarine landslides, shallow gas and shallow water flow, which may bring about serious impacts on the se- curity of the drilling operation by leakages, blowouts, platform instability and even collapse. We analyzed in this paper the well-logging data of the ODP Leg 184 Sites 1144, 1146, 1148 and the IODP Leg 349 Sites U1431, U1432, U1433, U1435, and found the relationships between the normal compaction and the sediments composition, sedimentation rates and burial depth etc. Taking the deepwater basin of the South China Sea as examples. Established upon the research are the primary relationship of the coefficients of normal compaction and mudline porosity with depth in deepwater basin of the South China Sea. The results could be used as a reference for geohazards researches, especially for the overpressured geohazards in deepwater.

关 键 词：正常压实系数 沉积物组分 沉积物深度 

分 类 号：P736.21[天文地球—海洋地质]