气水分布复杂是莺歌海盆地东方13气田天然气勘探的难题.基于7口井岩性、测井解释的资料分析和2条连井剖面的对比,结合过井地震剖面解释、气田地质特征研究,揭示了东方13气田的气水空间分布规律和模式.研究表明:气藏主要分布在海底扇的水道发育部位,平面上呈低部位是水、高部位是气的边水气藏结构,从东方13-2构造至东方13-1构造的东部,气藏规模逐渐变小,且变得分散.地层水可分为统一边水、局部深切水道底水、致密砂岩引起的层内水等3种类型.局部深切水道底水和致密砂岩引起的层内水常见于东方13-2构造和东方13-1构造统一边水气藏的中部,这使得气藏的气水分布关系复杂化.基于气水关系和气藏规模推断,东方13气田是由东方13-2边水整装大型气藏、东方13-1边水中型气藏和东方13-1边部分散小型气藏构成,气水按该3种气藏模式有规律地分布.

The complex distribution of gas and water is a difficult problem in the exploration of natural gas in Dongfang 13 gas field, Yinggehai Basin. Based on the analysis of the lithology and logging interpretation data of 7 wells and the comparison of 2 cross-well sections, combined with the interpretation of the cross-well seismic section and the study of the geological characteristics of the gas field, the gas-water spatial distribution law and model in Dongfang 13 gas field are revealed. It is shown that the gas reservoirs are mainly distributed in the channel of submarine fan, with gas reservoir structure of the low part developing water and the high part developing gas edge water. From the Dongfang 13-2 structure to the east of the Dongfang 13-1 structure, the gas reservoir scale gradually becomes smaller and more dispersed. The formation water can be divided into three types: united edge water, local deep channel bottom water and inner layer water caused by tight sandstone. The bottom water and inner layer water are common in the middle of the edge water gas reservoir of the Dongfang 13-2 structure and the Dongfang 13-1 structure, which complicates the gas water distribution of the gas reservoir. Based on the gas-water distribution and the scale of gas reservoir, it is inferred that Dongfang 13 gas field is composed of Dongfang 13-2 edge water integrated large-scale gas reservoir, Dongfang 13-1 edge water medium-scale gas reservoir and Dongfang 13-1 edge dispersed small-scale gas reservoir. Gas and water are regularly distributed according to the three gas reservoir models.