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1引言 地震地层方法(Mitchum等,1977;Vail等,1977;Sangree,1979;Ringis,1986)已用于研究越南的构造复杂的陆架及鉴别非背斜油气圈闭。对薄过渡层的基本地震响应和地层层序的合成地震记录虽有很好了解,但它们的常规应用在现代技术到来之前是不可能的。在最近几年,地震资料的质量在一些方面有了改进,即现在有可能精确地解释储集条件和沉积相。 关于越南南部陆架的初步成果已由Mai Thanh Tan(1990)和Truong Minh等(1991)发表。本文目的是进一步描述越南南部陆架上的地震层序、沉积演化和油气圈闭(图1a、1b)。2 越南南部第三纪盆地演化
1 Introduction Seismic stratigraphy methods (Mitchum et al., 1977; Vail et al., 1977; Sangree, 1979; Ringis, 1986) have been used to study the complex tectonics of the shelf in Vietnam and to identify non-anticlinal hydrocarbon traps. Although the basic seismic response of the thin transitional layer and the synthetic seismograms of stratigraphic sequences are well understood, their routine application is not possible until the advent of modern technology. In recent years, the quality of seismic data has been improved in a number of ways that it is now possible to interpret reservoir conditions and sedimentary facies accurately. Preliminary results on the continental shelf in southern Vietnam have been published by Mai Thanh Tan (1990) and Truong Minh et al. (1991). The purpose of this paper is to further describe the seismic sequence, sedimentary evolution and hydrocarbon traps on the continental shelf in southern Vietnam (Figures 1a and 1b). 2 Evolution of Tertiary Basin in southern Vietnam