摘要
塔里木盆地塔中—顺北地区下志留统柯坪塔格组作为一套典型的海相碎屑岩沉积地层,砂泥叠置关系复杂,仅通过测井曲线形态的传统方法不利于高分辨率层序的精确划分。首先根据地震剖面与测井滤波处理曲线来识别不整合面及相关的整合面,得出长期基准面变化情况;其次用最大熵谱图与合成预测误差滤波划分中期基准面旋回边界;最后从动态最大熵谱中提取出米氏旋回参数,进一步获取带通滤波信号组和天文周期单元,划分短期基准面旋回,最终完成高分辨率层序地层的划分。柯坪塔格组识别出3种三级层序边界类型:连续海侵背景下的T1型、完整海侵—海退背景下的T2型、海退为主的T3型。目的层共划分出4个长期、16个中期以及50个短期基准面旋回。
As typical marine clastic sedimentary strata,the Lower Silurian Kepingtage Formation in the Ta⁃zhong-Shunbei area of Tarim Basin has a complicated sand-mud superimposed relationship.It is not conducive to the accurate division of high-resolution sequence if it is only based on logging lithology and logging curve shape.This paper identifies the unconformity surface and the related integration surface based on the seismic pro⁃file event axis and the logging filter curve,which derives the changes of long-term benchmark.The maximum entropy spectrogram and synthetic prediction error filter curve is used to divide the mid-term base-level cycle.Extract Milankovitch cycle parameters from the dynamic maximum entropy spectrum,obtain the band-pass fil⁃tered signal group and the astronomical period unit,and divide the short-term base-level cycle.Kepingtage For⁃mation identified three types of tertiary sequence boundary types:T1 in the case of continuous transgression,T2 under the condition of complete transgression and regression,and T3 dominated by the regression,including 4 long-term,16 medium-term,and 50 short-term data cycles.The results have indicative significance for the formation analysis of sedimentary microfacies under multi-phase hydrodynamic conditions of the target layer.
作者
田双良
张立强
严一鸣
李志欣
TIAN Shuang-liang;ZHANG Li-qiang;YAN Yi-ming;LI Zhi-xin(School of Geoscience,China University of Petroleum(East China),Qingdao 266580,China;Geophysics Corporation,Ltd.,Sinopec,Nanjing 211100,China;Research Institute of Petroleum Exploration and Development,Beijing 100083,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2020年第10期1466-1478,共13页
Natural Gas Geoscience
基金
中国科学院战略先导科技专项“深层碎屑岩储层发育机理与分布规律”(编号:XDA14010202)
国家油气重大专项“深层超深层油气成藏过程与勘探新领域”(编号:2017ZX05008-004)联合资助.
关键词
塔里木盆地
塔中—顺北地区
柯坪塔格组
高分辨率层序地层
滤波分析
Tarim Basin
Tazhong-Shunbei area
Kepingtage Formation
High-resolution sequence stratigraphy
Filter analysis
