| 摘要: |
| 块状、层状和纹层状泥质烃源岩是陆相湖盆烃源岩的代表,为了查明它们在生油窗内排出和滞留液态烃的数量和组成,利用高温高压装置进行生排烃模拟实验,发现它们在生油高峰期,块状烃源岩液态烃排出率可达77.8%,层状和纹层状烃源岩液态烃排出率约55%。3种烃源岩排出和滞留液态烃差别明显的有:块状烃源岩排出液态烃γ-蜡烷/C31-藿烷比值小于滞留液态烃,而层状和纹层状烃源岩该比值是相反的。排出和滞留烃表现不一致的有(与岩性无关):轻质组分较重质组分更容易排出,排出液态烃Ts/Tm高于滞留液态烃,C29ββ/(ββ+αα)比值也是如此；三环/五环(萜烷)、ΣC27/ΣC29(胆甾烷)两个比值在排出液态烃内高、在滞留液态烃内低。反映成熟度和沉积环境的OEP和Pr/Ph等参数在排出与滞留烃内基本一致,也与烃源岩岩性无关。该文对于定量分析烃源岩油气生成与排出过程特别是油源对比具有基础地质意义。 |
| 关键词: 块状烃源岩 层状烃源岩 纹层状烃源岩 油气生成 液态烃排出 排出和滞留液态烃组成差别 |
| DOI：10.3969/j.issn.1673-5005.2019.05.005 |
| 分类号::P 618 |
| 文献标识码:A |
| 基金项目:国家油气专项(2016ZX05006-007) |
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| Stimulations on generation, expulsion and retention of liquid hydrocarbons in source rocks deposited in lacustrine basin and their significance in petroleum geology |
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JIN Qiang, ZHANG Huijun, CHENG Fuqi, XU Jinjun
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(School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China)
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| Abstract: |
| Massive, lamellar and laminated shales are typical lithology of source rocks deposited lacustrine basins. In order to investigate quantities and constituents of expelled and remaining liquid hydrocarbons from/in the source rocks, the authors conducted a series of stimulations in high-temperature and high-pressure conditions on the source rock samples, and found that 77.8% liquid hydrocarbons were expelled from the massive sample, and about 55% liquid hydrocarbons were expelled from the lamellar and laminated samples. There are obvious differences in some parameters between expelled and remaining liquid hydrocarbons from/in the three kinds of source rocks:radio of gammacerane/C31-hopane less in expelled hydrocarbons from the massive source rocks than in remaining corresponding components, but exactly the opposite in the hydrocarbons from/in lamellar and laminated source rocks. There are different appearances between the expelled and remaining liquid hydrocarbons but no corresponding to the lithology of the source rocks:the lighter hydrocarbons being more in the expelled components and the heavy hydrocarbons being more in the remaining, Ts/Tm radio of hopanes in the expelled hydrocarbons being bigger than that in remaining components, appearance of C29ββ/(ββ+αα) radio being in the same way, tricyclic terpane/pentacyclicterpane and ΣC27/ΣC29 of cholestanes radios being higher in the expelled hydrocarbons than in the remaining hydrocarbons. Parameters such as OEP respecting thermal maturity and Pr/Ph corresponding to the depositional environment of the source rocks are rather similar either in expelled hydrocarbons or in remaining components. The authors concluded that quantity and composition differences of expelled and remaining hydrocarbons from/in different source rocks should be considered carefully in oil generation, primary migration and oil correlation in general petroleum geology. |
| Key words: massive source rock lamellar source rock laminated source rock hydrocarbon generation liquid hydrocarbon expulsion composition difference between expulsion and retention hydrocarbon |
