论文部分内容阅读
在层序地层学研究中,关键是层序划分和对比。而层序划分、对比的关键是层序识别。层序的识别包括层序界面(层序的底界面、初始海泛面和最大海泛面)的识别和构成层序的体系域识别。这里,在众多前人研究成果的基础上,详细研究了层序的测井、地震响应特征,即层序界面和体系域在测井曲线上和地震剖面上的特征。其中,层序底界面在测井上表现为突变的钟型、箱型或侧积式曲线的底界;在地震剖面上表现为剥蚀、顶超、上超、下超;而体系域在测井曲线上的响应为:低水位体系域的海底扇以漏斗形中、高幅的前积式,或钟型中、低幅的后积式模式为特征,陆坡扇成钟型、正向齿形,自下而上幅度由中高幅→低幅,即具后积式测井模式,低水位楔的测井曲线表现为旋回性进积模式特征,其特征表现为锯齿状箱型。海侵体系域的测井曲线呈现向上变细、变深序列,并表现为钟型、正向齿形或齿化状,幅度由高幅变化为低幅,包络线具后积式特征。高水位体系域相应的测井曲线呈现中幅箱形或桶形,不同体系域在地震剖面上的响应特征明显不同。
In the study of sequence stratigraphy, the key is the sequence division and contrast. The order of division, the key is to compare sequence identification. Sequence identification includes the identification of sequence boundaries (the bottom interface of the sequence, the initial sea surface and the largest sea surface) and the sequence of the system domain. Here, based on many previous research results, we have studied in detail the sequence logging and seismic response characteristics, that is, the characteristics of sequence boundaries and system tracts on log curves and seismic profiles. In the log sequence, the bottom interface of the sequence shows as the bottom boundary of the abrupt bell, box or side-area curve. On the seismic profile, it shows denudation, top over, over and under, and the system domain is under measurement The response on the well curve is that the submarine fan in the lowstand system tract is characterized by a funnel-shaped, high-amplitude pre-integral or bell-shaped middle and low amplitude post-regressive pattern, The bottom-up amplitude ranged from medium to high amplitude to low amplitude, that is, with a post-product logging pattern. Logs with low water level wedges are characterized by a cyclonic pattern of fouling, which is characterized by a jagged box pattern. The logging curves of the transgressive systems tract show an upward tapering and a deepening sequence with bell-shaped, forward-toothed or tooth-like shapes, the amplitude changes from high amplitude to low amplitude, and the envelope has a posterior product feature. Corresponding logs of high-water system tract show medium-amplitude box-shape or barrel shape, and response characteristics of different system fields on seismic profile are obviously different.