重排藿烷参数示踪陇东地区油藏充注途径

发布时间：2018-06-12 14:54

本文选题：重排藿烷/藿烷比值 + 充注途径　；参考：《石油与天然气地质》2017年05期

【摘要】：鄂尔多斯盆地陇东地区延长组长7油层组原油为弱氧化-还原、淡水-微咸水环境下低等藻类与高等植物混源生成,均为成熟-高成熟阶段,属于同一族群原油,且在平面上普遍分布。大部分学者都集中研究原油垂向运移成藏机理,但是对于平面上的充注运移机理则一直少有关注和研究。基于重排藿烷/藿烷(C_(30)*/C_(30)H)比值的热稳定性,分析C_(30)*/C_(30)H参数在表征石油充注运移方面的可行性,认为对于成熟-高成熟原油,C_(30)*/C_(30)H值可能不仅仅是热成熟度的良好响应,对比C_(30)*/C_(30)H参数与MDR参数(4-/1-甲基二苯并噻吩比值)、暴露/屏蔽烷基二苯并噻吩参数,发现C_(30)*/C_(30)H参数与两参数都具有极好的正相关性,表明C_(30)*/C_(30)H参数不仅是良好的热成熟度参数还是良好的石油充注运移参数。利用C_(30)*/C_(30)H参数示踪陇东地区长7油层组的石油充注方向,发现华池地区为主要充注点,向西南、北东方向呈波阵面的方式充注运移,具有连续充注的特征。研究结果初步表明,C_(30)*/C_(30)H参数是示踪石油充注途径的有效参数。
[Abstract]:The crude oil of Yanchang formation No. 7 in Longdong area, Ordos Basin, is weak oxidation-reduction, and low alga and higher plants are mixed in freshwater and brackish water environment, all of which belong to the same ethnic group crude oil, all of which are mature to high maturity stage. And it is widely distributed on the plane. Most scholars focus on the mechanism of vertical migration and accumulation of crude oil, but little attention has been paid to the mechanism of filling and migration on the plane. Based on the thermal stability of the 30 / C / C / C / C / C / C / H ratio of rearrangement of hopane / hopane, this paper analyzes the feasibility of the C30 / C / C / C / 30 H parameter in characterizing the filling and migration of petroleum. It is considered that the value of 30 / 30 / C / C / C / C / C / C / C / C / 30 H of the mature / highly mature crude oil may be more than just a good response to the thermal maturity. Comparing the Che / C / C _ T parameter with the MDR parameter and the ratio of 4 / 1 / 1-methyl-dibenzothiophene, and exposing / shielding the alkyl dibenzothiophene parameter, we found that the C _ S _ 30 / C _ T _ (30) H parameter has an excellent positive correlation with the two parameters. The results show that the parameters of C / C _ (30) H are not only a good thermal maturity parameter but also a good oil filling and migration parameter. By using the parameters of Che / Che / C / C / C / T to trace the direction of oil filling in Chang7 formation of Longdong area, it is found that the Huachi area is the main filling point and is filled and transported in the way of wave front in the direction of southwest and north to east, which has the characteristics of continuous filling. The results show that the parameters of 30 / 30 / C / C _ (30) H are effective parameters for tracer oil filling pathway.
【作者单位】：长江大学资源与环境学院长江大学油气资源与勘探技术教育部重点实验室;中国石油勘探开发研究院;
【基金】：中国石油天然气股份有限公司科技创新项目(2008D-5006-01-10) 中国地质调查局“中国中东部构造体系控油作用研究”项目(1212011120965)
【分类号】：P618.13

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