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番禺4(番遇4)洼陷为珠江口盆地珠一坳陷西侧一个相对独立的“小而肥”的富生烃洼陷,古近系分割性强、地震反射杂乱,且钻井勘探程度很低,前人尚未对文昌组进行过深入研究。以经典层序地层学理论为指导,通过对地质、岩心、钻井、测井及地震等资料的综合分析,并以物源和构造分析作重要辅助,将番禺4洼文昌组从下往上划分为3个层序SQ1、SQ2和SQ3,其中SQ2层序内部又划分为3个次一级的层序单元SQ2a、SQ2b和SQ2c,对应的层序界面分别为SB1、SB2a、SB2b、SB2c、SB3,查明了层序界面在地震反射终端、岩性及电性等方面的鉴别特征,认为层序SQ1、SQ2和SQ3沉积时期分别对应于断陷湖盆发育过程中的初始断陷期、扩张期和萎缩期。
Panyu 4 (FanYu 4) Sag is a relatively independent small and fat-rich hydrocarbon-depleted sag on the west side of the Zhu 1 Depression in the Pearl River Mouth Basin. The Paleo-4 Paleozoic Sag is highly divisible and the seismic reflection is disorderly. To a very low degree, our predecessors have not conducted any further studies on the Wenchang Formation. Guided by the theory of classic sequence stratigraphy, through the comprehensive analysis of geology, core, drilling, well logging and seismic data and the important aid of provenance and tectonic analysis, the Wenchang Formation of 4 depression in Panyu is divided from bottom to top There are three sequences SQ1, SQ2 and SQ3, of which SQ2 sequence is divided into three sub-sequence units SQ2a, SQ2b and SQ2c. The corresponding sequence interfaces are SB1, SB2a, SB2b, SB2c and SB3 , The distinguishing characteristics of sequence boundaries in terms of seismic reflection terminal, lithology and electrical properties were ascertained. It is concluded that the sequence of sequence SQ1, SQ2 and SQ3 corresponds to the initial fault depression and expansion during the development of fault-faulted lake basins, respectively Period and atrophy.