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渤海湾盆地黄骅坳陷歧口凹陷(大港探区)岩性地层油气藏分布广、类型多。形成规模储量的主要为储集层上倾尖灭和构造-岩性复合地层两大类油气藏。决定其圈闭分布的主要因素是古构造背景与沉积物源体系的匹配,成藏机理为“三元耦合控藏”。该工区有5个领域值得重视:①古隆起围斜、倾没端、构造坡折带之反向碎屑物源区;②沉积频繁相变区;③古隆起缓坡带;④(半)封闭湖湾区;⑤湖盆陡坡坡折带及凹陷之中卸载区。根据“宏观岩性地层油气藏”勘探原理,将构造带当作岩性变化带,在复式油气藏勘探方法基础上,采用以岩性油气藏勘探与精细勘探相结合的勘探方法。同构造油气藏相比,该工区岩性地层油气藏分布空间范围广,体系域全,压力场宽,储量也占优势,是油气勘探的重点目标之一。
The Qikou Depression (Dagang Exploration Area) of the Huanghua Depression in the Bohai Bay Basin is characterized by a large number of lithologic reservoirs. The major reservoirs are mainly two types of oil and gas reservoirs, which are diphtheria and tectono-lithologic complex strata on the reservoir. The main factor that determines the distribution of traps is the matching of palaeotectonic background and sedimentary source system. The mechanism of hydrocarbon accumulation is “ternary coupling and controlling reservoir”. There are five areas in this area that deserve attention: (1) the paleo-uplift is inclined and incline to construct the reverse detrital source area of the slope break; (2) the sedimentary facies zone Hu Bay area; ⑤ steep slope slope break and depression in the unloading area. According to the exploration principle of “macro-lithostratigraphic reservoirs”, the tectonic zone is regarded as a lithologic change zone. On the basis of multi-reservoir exploration methods, an exploration method combining lithologic reservoir exploration and fine exploration is adopted. Compared with tectonic reservoirs, the lithologic stratigraphic reservoirs in this work area have a wide range of spatial distribution, wide system tract, wide pressure field and abundant reserves, and are one of the key targets for hydrocarbon exploration.