主动大陆边缘海沟-斜坡盆地沉积体系分析——以缅甸若开海岸盆地某工区为例

Sedimentary systems in the trench-slope basins along the active continental margins: An example from one block in the Arakan sea basin,Myanmar

本文以国内少见的发育在主动大陆边缘的特殊盆地类型海沟-斜坡盆地作为研究对象,通过建立井震结合的不同沉积体系的地质-地球物理识别模板,用二维地震资料对研究区目的层的沉积体系进行了解析。结果显示,研究区发育窄的滨浅海、小规模的三角洲、浊积扇、下切谷、半深海陆坡和半深海平原等沉积体系。滨浅海、三角洲和浊积扇沉积体系发育的砂体是主要的储集体。海沟-斜坡盆地的规模较小,以生气为主,可能形成中小型断块油气藏。

The sedimentary systems are explored on the basis of 2D seismic data for the target strata in one block in the Arakan Coast basin, Myanmar developed in the trench-slope basins along the active continental margin. The results of research in this study have disclosed that the sedimentary stsyems in the study area dominantly consist of the littoral-shallow sea, delta, turbidite fan, incised valley, bathyal continental slope and bathyal plain sedimentary systems. The reservoir rocks are mainly developed in the littoral-shallow sea, delta and turbidite fan sedimentary systems. The small-sized trench-slope basins may be host to the medium- or small-sized block oil-gas pools dominated by natural gas.