中—新生代大陆边缘盆地海相烃源岩生烃特征

发布时间：2018-01-15 17:43

本文关键词：中—新生代大陆边缘盆地海相烃源岩生烃特征　出处：《石油学报》2017年06期 　论文类型：期刊论文

【摘要】：近年来,中—新生代大陆边缘盆地海相烃源岩的成因类型研究取得了新的进展,根据生源构成和沉积环境将大陆边缘盆地海相烃源岩划分为海相内源型、海相陆源型和混合生源型3种成因类型。在大陆边缘盆地海相烃源岩成因类型划分的基础上,利用生烃模拟实验研究了海相烃源岩的生烃特征,发现不同成因类型海相烃源岩的生烃特征存在显著差异:海相陆源型烃源岩具有生烃活化能分布较为分散、生烃门限温度低、主生烃期温度范围宽、生烃转化率曲线平缓,无明显的生烃高峰期的特征;而海相内源型烃源岩则具有活化能分布较为集中、生烃门限温度高、主生烃期温度范围窄、生烃转化率曲线较陡峭、有明显生烃转化高峰的特征;海相混合生源型烃源岩的生烃特征介于上述2种海相烃源岩之间。显微组分组成的差异是造成不同成因类型海相烃源岩生烃特征不同的根本原因。
[Abstract]:In recent years, new progress has been made in the study of genetic types of marine source rocks in Meso-Cenozoic continental margin basins. According to the source composition and sedimentary environment, marine source rocks in continental margin basins are classified into marine endogenous source rocks. Based on the classification of genetic types of marine source rocks in continental margin basins, hydrocarbon generation characteristics of marine source rocks are studied by using hydrocarbon generation simulation experiments. It is found that there are significant differences in hydrocarbon generation characteristics among marine source rocks of different genetic types: Marine continental source rocks are characterized by dispersed hydrocarbon generation activation energy distribution, low threshold temperature and wide temperature range during the main hydrocarbon generation period. The hydrocarbon-generating conversion curve is smooth and has no obvious characteristics of peak hydrocarbon generation. On the other hand, the marine source rocks have the characteristics of concentrated distribution of activation energy, high threshold temperature of hydrocarbon generation, narrow temperature range of main hydrocarbon generation period, steep conversion curve of hydrocarbon generation and obvious peak of hydrocarbon generation transformation. The hydrocarbon generation characteristics of marine mixed source rocks are between the above two marine source rocks. The difference of maceral composition is the fundamental reason for the difference of hydrocarbon generation characteristics of marine source rocks of different genetic types.
【作者单位】：中海油研究总院;
【基金】：国家重大科技专项“西非和南美海域重点区油气地质评价及关键技术研究”(2017ZX05032-01) 中海石油(中国)有限公司综合科研“西非被动大陆边缘盆地海相烃源岩评价方法研究”(YXKY-2015-ZY-07)资助
【分类号】：P618.13
【正文快照】： 在地理上属于海陆过渡地带的大陆边缘盆地,油气可采储量分别占全球石油和天然气总量的1/2和2/3,是当前海洋石油勘探的热点和前沿。现代海洋地质学的研究表明大陆边缘盆地是海相层系烃源岩发育的主要场所[1-6],现今世界上大陆边缘许多著名油气富集区的油气主要来自于海相烃源岩

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