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在北大港地区沙一段的层序地层学研究中,根据地震剖面同相轴的削截、上超和下超等地震反射类型识别层序界面,结合岩性旋回、测井曲线突变等标识识别层序界面,并在联井剖面上进行对比、标定,采用经典层序地层学中的层序、准层序概念,划分了五级层序界面。在体系域的划分上,则强调了湖盆层序成因的自身特点,划分低位体系域(LST)、湖扩体系域(EST)和高位体系域(HST)。识别出的8个层序界面划分为3个二级界面和5个三级界面,沙一下层序划分为3个体系域、9个准层序组、20个准层序。
In the study of sequence stratigraphy of the first member of the Beidagang area, according to the seismic reflection type recognition sequence interface such as truncation of the seismic profile, super-subsurface and super-subsurface, combined with the identification of identification layers such as lithologic cycles and sudden changes in logging curves, Order interface, and compare and calibrate it on the cross section of coal well. By using the concept of sequence and quasi-sequence in classic sequence stratigraphy, the five-level sequence boundary is divided. On the division of the system tract, the characteristics of the genesis of the lake basins are emphasized, and the lowstand system tract (LST), lakeshore system tract (EST) and highstand system tract (HST) are classified. The identified sequence boundaries of the eight sequences are divided into three second-level interfaces and five third-level interfaces. The sequence of the sand is divided into three system domains, nine quasi-sequence groups and 20 quasi-sequence sequences.