摘要:
本文通过岩心、测井、录井资料,结合研究区古气候特征、岩性特征、古生物标志和沉积构造特征,提出江汉油田潜江凹陷新沟咀组属于盐湖盆地浅水湖泊三角洲沉积。在盐湖沉积背景下,新沟咀组沉积时期气候相对干旱,水体较浅,无深湖-半深湖沉积,且研究区地势平缓,倾角相对较小,在河流入湖处发育浅水三角洲沉积体系,并且发育三角洲平原、三角洲前缘和前三角洲泥三种沉积亚相。以沉积相平面分布图为基础,建立了新沟咀组浅水三角洲沉积模式。
Abstract:
The Xingouzui Formation in the Qianjiang depression, Jianghan Oil Field is interpreted to be assembled by the shallow-water lacustrine delta deposits in the salt lake basin in terms of core examination, well logs, palaeoclimate, lithology, palaeontology and sedimentary structures. During the deposition of the Xingouzui Formation, the climates were relatively dry; the lake water was relatively shallow, and no abyssal-bathyal deposits were laid down. There occur the shallow-water delta depositional systems in the inlets, in which the delta plain, delta front and prodelta mud subfacies are recognized. The subaqueous distributary channel deposits are relatively developed as framework sandstones in the shallow-water delta. The shallow-water delta is mainly controlled by fluviation, and the sandstones are aligned as bands. The results of research in this study result in the construction of planar distribution of sedimentary facies and sedimentary model for the shallow-water delta, and thus have assisted in further exploration and development of the Jianghan Oil Field.
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