高分辨率层序基准面变化(半)定量分析方法及其在松辽盆地泉四段的应用  

A semiquantitative analytical method for base level changes of high-resolution sequence and its application to study of Member 4 of Lower Cretaceous Quantou Formation in Songliao Basin

作　　者：林孝先[1] 侯中健[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059

出　　处：《成都理工大学学报（自然科学版）》2014年第2期157-170,共14页Journal of Chengdu University of Technology: Science & Technology Edition

摘　　要：探讨、总结高分辨率层序及其基准面变化的(半)定量研究方法。提出了一套高分辨率层序基准面变化(半)定量分析方法及技术流程,其前提和基础是对高分辨率层序的精细、(半)定量划分,可通过定性的经典地质学层序界面识别和(半)定量的测井小波分析相结合得以实现。以划分出的超短期(或短期)层序为单元,通过压实校正还原其初始沉积厚度,绘制Fischer图解,获得基准面变化曲线,最后综合对比,总结基准面变化规律。将该方法应用于松辽盆地红岗北地区下白垩统泉头组第四段研究中,将泉四段(半)定量划分出1个长期(Ⅲ级)层序,4个中期(Ⅳ级)层序,22个短期(Ⅴ级)层序和69个超短期(Ⅵ级)层序。以超短期层序为单元的Fischer图解揭示出基准面具有一期长时间、大规模上升→短时间、小规模下降的变化规律,这与研究区湖平面、松辽盆地基准面、全球海平面变化规律一致。高分辨率层序基准面变化(半)定量分析方法有利于高分辨率层序及基准面变化的精细、定量研究。This paper summarizes and presents a semiquantitative analytical method for the base level changes of the high-resolution sequence. This method is successfully applied to a study of Member 4 of Lower Cretaceous Quantou Formation in the northern Honggang area of Songliao Basin in China. The premise and foundation of the base level changes analysis are the fine and semiquantitative division of the high-resolution sequence stratigraphy. There are two methods of division. One is the qualitative classical geologic method, and the other is the semiquantitative wavelet analysis of logging curves. Taking super short-term sequences or short-term sequences as units, restoring their initial deposition thickness and calculating their average thickness of accumulated offset value, people are able to draw the Fischer plots and obtain the curves and laws of the base level changes. There are 1 long-term sequence cycle, 4 middle-term sequence cycles, 22 short-term sequence cycles and 69 super short-term sequence cycles in Member 4 of Quantou Formation in the northern Honggang area of Songliao Basin. The Fischer plots with 69 super short-term sequence cycles reveal the law that the base level changes are from a long time massive rise to a short time small decline and in step with the lacustrine level changes of study area, the base level changes of Songliao Basin and the eustacy in Lower Cretaceous. The semiquantitative analytical method for the base level changes of the high- resolution sequence is beneficial to the fine and quantitative study of the high-resolution sequence and the base level changes.

关 键 词：基准面变化 高分辨率层序 Fischer图解 小波分析 压实校正 泉头组 松辽盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]