THE RESEARCH OF OIL-GAS DISTRIBUTION CHARACTERISTICS IN THE LANGGU SAG OF THE BOHAI BAY BASIN
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摘要: 渤海湾盆地廊固凹陷已全面进入了隐蔽油气藏勘探阶段,如何认识层序地层格架内各种类型油气藏的分布特征是指导本区下一步勘探方向的关键.通过深入研究廊固凹陷古近系地层层序特征,根据其分布组合特点,建立了不同构造单元沉积模式,进一步剖析了凹陷内不同沉积体系特征及其不同组合样式.从整体沉积背景、构造背景认识出发,厘清了层序格架内沉积体系的分布特征;建立了陡坡带、洼槽带及中央带各具特色的6类成藏模式.指出多期次的沉积体系组合、多期次的构造运动叠加、生油层—储集体—圈闭的时空匹配对廊固凹陷各种类型油气藏的分布和富集发挥了重要作用.Abstract: The recent work has already come into the stage of subtle reservoir exploration period in the Langgu Sag of the Bohai Bay Basin.So it is the key issues to instruct next exploration direction that know the distribution characteristics about all kinds of pools in the sequence stratigraphic framework.By means of comprehensive analysis of sequence characteristic and deposit distribution combination,established formation pattern of diffe-rent tectonic unit in the Langgu Sag.And those are taken apart more in different sedimentary system and its combination styles.From the whole deposit and structural background,build on the distribution characteristic of the reservoir in the sequence framework.Six deposit formation patterns were established in the actic,billabong and center regions.And point out that the more sedimentary systems,more tectogenetic movement,the matching of source layer-reservoir-encirclement make importance action to the distribution and enrichment of structure and subtle hydrocarbon pools.
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