HYDROCARBON ACCUMULATIONS SOURCED FROM GAS HYDRATE-AN IMPLICATION TO PETROLEUM EXPLORATION IN PALEOPLATFORMS
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摘要: 大洋(地槽)区回返造山之前在水合物稳定带封盖下的游离气——由生物甲烷及热解烃类组成,当地壳抬升、温压变化时向地形上倾方向迁移,途经多孔隙储集体时可能被捕集成藏。台西南海域的大量天然气水合物被证实是形成台湾南部众多泥火山、气苗以及油气藏的来源。由此推断造山带中的过成熟烃源岩也曾向地台区(后来的克拉通盆地)提供烃源,也因此可解释中东"油极"的形成以及如四川盆地的天然气储量与盆地内已知烃源岩生烃量不匹配的难题。Abstract: The free gas,formed by biogenic methane and pyrolysis hydrocarbon,was sealed under gas hydrate stable zone in the ocean(geosyncline) before orogenic movement.It was migrated upward with crustal uplift and thermo-pressure change,and could been accumulated passing through reservoirs.It was proved that the various maccalubers,gas seepage and hydrocarbon reservoirs were formed by gas hydrate in southwestern Taiwan sea area.Therefore,it might be inferred that the overmatured source rocks in orogenic belt provided hydrocarbon to the platform area(late cratonic basin),which could explain the formation of "oil pole" in Middle East and solve the problem of mismatch of gas reserve with hydrocarbon generation amount of source rocks in the Sichuan Basin.
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Key words:
- gas hydrate marine /
- sediments /
- hydrocarbon reservoir /
- oil and gas prospectives
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