塔里木盆地中深地区寒武系盐下白云岩油气来源及差异聚集

发布时间：2018-03-01 19:23

  本文关键词： 塔里木盆地 中深地区 盐下白云岩 油气来源 油气差异聚集　出处：《石油勘探与开发》2017年01期 　论文类型：期刊论文

【摘要】：基于塔里木盆地中深地区储集层样品、原油样品和天然气样品的地球化学特征分析,研究中深地区寒武系盐下白云岩油气来源及油、气差异聚集现象。通过质谱检测发现储集层及原油样品重排甾烷含量低、C_(28)甾烷含量高,伽马蜡烷含量高,原油中存在芳基类异戊二烯烃化合物;通过天然气组成分析发现N_2含量低,为0.24%~4.02%。由此判断油气来源于寒武系—下奥陶统烃源岩。中寒武统天然气δ~(13)C1值为-51.4‰~-44.7‰,干燥系数为0.65~0.78,为原油伴生气;下寒武统天然气δ~(13)C1值为-41.4‰~-40.6‰,干燥系数为0.99,为原油裂解气。塔里木盆地深层存在硫酸盐热化学还原反应生成的高含H_2S裂解气的充注,中寒武统储集层物性差、裂缝网络体系不发育,故充注程度低,天然气中H_2S含量低(0.003 8%~0.200 0%);下寒武统储集层物性好、裂缝网络体系发育,故充注程度高,天然气中H_2S含量也高(3.25%~8.20%)。综上,塔里木盆地中深地区寒武系盐下白云岩油气来源于寒武系—下奥陶统烃源岩,其差异聚集是储集层物性以及裂缝网络体系发育程度的综合影响所致。
[Abstract]:Based on the geochemical analysis of reservoir samples, crude oil samples and natural gas samples in the middle and deep area of Tarim Basin, the oil and gas source and oil of Cambrian subsalt dolomite are studied in this paper. Gas differential aggregation phenomenon. By mass spectrometry, it was found that the rearrangement sterane content of reservoir and crude oil was low, the content of sterane was high, the content of gamma wax was high, and there were aryl isoprene hydrocarbon compounds in crude oil. Through the analysis of natural gas composition, it is found that the content of Nai _ 2 is low, which is 0.24 ~ 4.02. The hydrocarbon is derived from Cambrian-Lower Ordovician source rock. The 未 ~ (13) C _ (1) value of natural gas in the Middle Cambrian is -51.4 鈥，

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