OIL AND GAS EXPLORATION FIELD IN RIFT STRATUM IN THE SOUTH OF THE SONGLIAO BASIN
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摘要: 松辽盆地南部地区发育多个富含油气的断陷和凹陷,十屋断陷和长岭断(凹)陷是其中富含油气的地质单元,已发现了一批中小型油气田。研究认为该区发育断陷层和坳陷层2套含油气系统,断陷层油气藏包括火山岩油气藏、地层不整合油气藏、陡坡岩性油气藏和基岩潜山变质岩油气藏等,主要受有效火山岩储层和有效低孔渗碎屑岩储层发育情况控制,与构造复合分别形成火山岩储层构造油气藏和低渗透砂岩储层构造油气藏;坳陷层油气藏受三角洲前缘相砂体层布控制,在有利的构造背景下形成构造—岩性油气藏。研究认为,松辽盆地南部断陷层勘探领域包括:①火山岩油气藏,②地层不整合油气藏,③陡坡岩性油气藏,④基岩潜山变质岩油气藏。Abstract: There are many rifts and depressions with rich oil and gas in the south of the Songliao Basin.Shiwu Depression and Changling Rift(depression) are the geological units with rich oil and gas,and a number of small and medium oil-gas fields had been discovered.Research suggested that there are two types of rift stratum and depression stratum petroleum systems.Oil-gas reservoir of rift stratum is mainly controlled by the efficient volcanic reservoir and low porosity-permeability of the reservoir.Structural reservoir of volcanic rocks and low-permeability sandstone reservoirs were formed composite with structural.Depression reservoir was controlled by sand distribution of delta front,forming structure-lithology reservoir at a favorable context.Studies suggest that exploration fields of rift stratum include: volcanic rocks reservoir,stratigraphic unconformity reservoir,steep lithology reservoir and metamorphic rock reservoir of bedrock.
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Key words:
- exploration field /
- rift stratum /
- reservoir types /
- Songliao Basin
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