深化泌阳凹陷认识 开拓油气勘探领域

湖相碳酸盐是国内外沉积学研究领域的极薄弱环节,对湖相碳酸盐岩的油气生成、油气分布、油藏及资源量的研究更显得严重滞后。泌阳凹陷湖相碳酸盐岩研究,深化了该凹陷的认识,增加了新的“碳酸盐岩型”烃源岩,明确了凹陷的非常规油气资源,拓展了找油气领域,发展了我国湖相油气地质学。并指出:①湖相碳酸盐岩在成熟阶段后期至高熟阶段束缚有机质的二次成烃作用不容忽视,是形成深层油气资源的另一重要来源,并且是凹陷带深层勘探的重要依据。②凹陷带是生烃中心,具有内生包裹型的生储盖配置成藏条件,值得重视。③下第三系大仓房组是深层勘探应予重视的一个领域。④建议重视湖相浊积岩的研究,探索浊积扇砂体油气藏。

Deepening Geologic Understanding and Opening up New Petroleum Exploration Areas in Biyang Depression

Carbonate of lake facies is a weak field of sedi-mentological research both at home and abroad.Re-search on hydrocarbon generation,petroleum distribution,reservoir and resources in carbonate of lake facies lag severely behind.Study on carbonate of lake facies in Biyang depression enriched knowledge of the depression,identified new source rock of carbonate type,revealed unconventional petroleum sources,and widened oil and gas exploration field.Secondary hydrocarbon generation of the fixed organic matters in carbonate of lake facies from late of mature stage to post mature stage was an-other important sources of oil and gas in th e deep se-ries of strata.The depression was the hydrocarbon gen-eration center and had favorable coincidence conditions of source rock,reservoir and seal.The Dacangfang For-mation in Paleogene is a new target of exploration.Pro-posals are put forward to emphasize study on turbidite of lake facies and turbidite fan sandbody reservoirs.