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OALib Journal期刊
ISSN: 2333-9721
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渤海湾盆地歧口凹陷沙河街组天然气赋存状态及其勘探意义
Keywords: 深层天然气,赋存状态,沙河街组,歧口凹陷,渤海湾盆地
Abstract:
？近年来，随着歧口凹陷深层油气的勘探，在深层(>3500m)沙河街组发现了大量的天然气藏，这些天然气藏主要沿深大断裂分布，垂向上具有下气上油、浅层为气的分布特征。为了解天然气在油水中的赋存状态，指导油气勘探，依据天然气各组分在油水中的溶解性的影响因素(温度、压力、油密度、水矿化度等)，计算出地层条件下天然气在原油和水中的溶解量，并与实际油气产量进行了对比分析。沙河街组天然气在油水中大多数达到饱和—过饱和，垂向上形成了深层游离气为主，向中深层逐渐过渡为油溶气及少量的游离气，临近沟通气源的深大断裂浅层因气源充足可形成游离气。据此探讨了研究区内油气运聚成藏模式，认为沟通油气源的深大断裂浅层是寻找凝析气藏和纯气藏的有利区域，中深层因生油窗内有大量原油的存在是寻找油藏、油溶气藏或轻质油藏的有利靶区，深层断裂相伴生的圈闭有利于凝析气藏及纯气藏的富集。
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