| 渤海海域东部不同富油凹陷烃源岩生烃特征差异及意义 |
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| 引用本文： | 于彪,刘建良,杨贵丽,刘可禹,刘晓林.渤海海域东部不同富油凹陷烃源岩生烃特征差异及意义[J].地质科技通报,2021,40(4):104. |
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| 作者姓名： | 于彪 刘建良 杨贵丽 刘可禹 刘晓林 |
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| 基金项目： | 国家科技重大专项2017ZX05009001中国科学院战略性先导科技专项XDA14010401山东省自然科学基金项目ZR2018BD018 |
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| 摘 要： | 渤海海域东部发育多个富油凹陷，具有较大的生烃潜力，由于各凹陷形成和发育过程不同，导致不同凹陷、不同层段烃源岩热演化和生、排烃特征具有明显差异。通过对渤海海域东部3个富油凹陷多套烃源岩进行埋藏史、热史和生、排烃史研究，厘定了渤中凹陷、渤东凹陷和庙西凹陷烃源岩生、排烃时间以及演化特征。结果表明:①渤海海域东部地区不同构造单元烃源岩热演化程度具有"西高东低"的趋势，渤中凹陷最早生烃时间为31.5 Ma，渤东凹陷和庙西凹陷最早生烃时间分别为28.2，11.2 Ma，渤中凹陷最早排烃时间为27.8 Ma，而渤东凹陷和庙西凹陷最早排烃时间分别为20.9，6.7 Ma；②渤中凹陷烃源岩热演化程度较高，现今主要为储层提供天然气，为环渤中凹陷地区形成天然气藏和凝析气藏提供了气源；渤东凹陷、庙西凹陷热演化程度依次降低，为储层提供大量油源，盆地边缘地区主要以油藏为主。
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| 关 键 词： | 富油凹陷 烃源岩 生、排烃特征 盆地模拟 渤海海域东部 |
| 收稿时间： | 2020-10-24 |
Hydrocarbon generation characteristics and signification of source rock in different oil-rich depressions in the eastern part of the Bohai Sea |
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| Abstract: | There are numerous oil-rich depressions in the eastern part of the Bohai Sea, which have a large hydrocarbon generation potential.Due to differences in the formation and development of these depressions, the thermal evolution and hydrocarbon generation and expulsion characteristics of the source rocks in different depressions and intervals are quite different.By studying the burial history, thermal history, and hydrocarbon generation and expulsion history of multiple sets of source rocks in three oil-rich depressions in eastern Bohai Sea, this paper determines the source rock generation, hydrocarbon expulsion timing and evolution characteristics of the Bozhong Depression, Bodong Depression and Miaoxi Depression.The results indicate that: ① The thermal evolution of source rocks in individual tectonic units in the eastern Bohai Sea has a general end of "high in the west and low in the east".The earliest hydrocarbon generation time in the Bozhong Depression is 34.4 Ma, while that for the Bodong and Miaoxi depressions are 30.8 Ma and 14.2 Ma, respectively.The earliest hydrocarbon expulsion time of the Bozhong Depression is 27.8 Ma, while that for the Bodong and Miaoxi depressions are 20.9 Ma and 6.7 Ma, respectively; ② The source rock in the Bozhong Depression has a relatively high degree of thermal evolution, and now it mainly provides natural gas to the reservoirs, which provides a gas source for the formation of natural gas reservoirs and condensate gas reservoirs in the Bozhong area.The degree of thermal evolution in the Bodong Depression and Miaoxi Depression gradually decreases, which provides a large amount of oil source for the reservoirs.The marginal areas of the basin are mainly oil reservoirs. |
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