福山凹陷白莲地区流沙港组一段扇三角洲沉积体系与油气成藏条件分析
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摘要
采用高精度层序地层学理论,综合利用钻井、测井、地震、油气显示等资料对北部湾盆地福山凹陷白莲地区流沙港组一段进行研究,识别出2个体系域即湖扩体系域(EST)和高位体系域(HST),并进一步在高位体系域(HST)识别出7个准层序组,构建该地区流沙港组一段的高精度等时地层格架。结合属性提取和测井约束反演等地球物理方法技术,在所构建的高精度层序地层格架约束下对福山凹陷金凤—白莲地区来自云龙凸起物源供给的流沙港组一段高位体系域(HST)扇三角洲沉积体系进行准层序组级别的层序地层单元对比,了解该地区扇三角洲多期朵体在横向上的期次性和纵向上的继承性,在利用地震属性勾绘朵体边界的基础上归纳其时空演化模式,最后在了解扇三角洲内部结构的基础上分析其油气成藏条件,总结3种准层序组尺度的生储盖组合类型,并简要归纳该地区的油气成藏类型。
Based on the theory of high resolution sequence stratigraphy and integrated analysis of drilling, logging,seismic information and oil-gas shows data, in the Liushagang Formation of Bailian area of the Fushan sag, Beibuwan basin, a high resolution sequence stratigraphy framework was established. The 2 system tracts were identified, including lake expanding system tract(EST) and highstand system tract(HST). In the highstand system tract(HST), 7para-sequence sets were identified. Combined with detailed seismic attribute extraction and logging constrained inversion,fan-delta sedimentary system of the highstand system tract(HST) in the first member of Liushagang Formation from Yunlong Uplift source in the Jinfeng-Bailian area of the Fushan sag was deciphered under the constraint of the high resolution sequence stratigraphy framework. The high resolution sequence formation units(para-sequence sets levels) of the favorable fan-delta reservoir were contrasted with each other. The characteristics and the inheritance in both horizontal and vertical of lobes of fan-delta in these areas were discussed. The pattern of time-spatial revolution was concluded by drawing up lobes boundaries through seismic attributes. Besides, three types of source-reservoir-cap rock combinations in the para-sequence sets scale were summed up and hydrocarbon reservoir model in this area was presented on the basis of clarifying internal structure of fan-delta and analysis on reservoir-forming conditions.
引文
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