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利用原油中含氮化合物组成和绝对浓度的变化,结合烃类生物标志物指标研究,该文探讨了我国渤海海域曹妃甸及临近地区的油气运移特征和注入方向。结果表明,原油中含氮化合物的分布和组成特征较好地指示了该区的油气运移效应。随着运移作用的加强,含氮化合物绝对浓度下降,“屏蔽”型与“暴露”型或“半屏蔽”型化合物的比值增加。沙垒田凸起油气运移方向是自东向西,注入点在凸起东侧。沙东南构造带油气存在2个运移和注入方向,即北东方向和西南方向。石臼坨凸起及倾没端油气是从西北方向运移和注入的。这与烃类生物标志物成熟度参数变化所揭示的油气运移和注入方向相一致,也与该区油气分布和勘探实践相吻合。
Based on the changes of the composition and the absolute concentration of nitrogenous compounds in crude oil, combined with the study of hydrocarbon biomarkers, this paper explores the hydrocarbon migration characteristics and injection directions of Caofeidian and its adjacent areas in the Bohai Sea. The results show that the distribution and composition of nitrogenous compounds in crude oil are good indicators of the hydrocarbon migration in this area. With the enhancement of migration, the absolute concentration of nitrogenous compounds decreased and the ratio of “shield” type to “exposed” type or “semi-shield” type compound increased. Sha Letian convex hydrocarbon migration direction is from east to west, the injection point in the convex east. There are two migration and injection directions of oil and gas in the southeashan structural belt, namely the northeast direction and the southwest direction. Shekutuo convex and dumping oil and gas migration and injection from the northwest. This is consistent with hydrocarbon migration and injection directions as revealed by changes in hydrocarbon biomarker maturity parameters and also with oil and gas distribution and exploration practices in this area.