阿尔凹陷油气地球化学特征研究

发布时间：2018-03-09 22:00

本文选题：阿尔凹陷　切入点：地球化学特征　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：二连盆地单凹陷资源规模小、砂体变化快、物性差异大,油气成藏条件和成藏状况复杂,决定其增储上产以“凹陷接替”为主的特征非常明显,而老凹陷优于勘探进展水平一直增强,对寻找整装储量提出了更高的要求,迫切要求有新区凹陷的创新性发现才能达到二连地区油气储量形成有序接替的目标。地质人员转变新区研究思路,把重点放在二连盆地周缘低勘探区域,大胆地对从未勘探过的、地处中蒙交界处附近的巴音宝力格隆起的阿尔凹陷进行搜索性研究。阿尔凹陷已完成了三维地震的面积共计400.4平方公里,具有矿权的区域内基本被三维地震所覆盖;已完成各类探井29口;系统的单井地质分析7口,还进行零散井的岩心、岩屑、原油、天然气的分析,共进行20余口井12个项目5000余块次样品分析。通过精细的样品分析,大量系统的资料整理,对凹陷油气分布、来源、运聚特征、资源分布有了较清楚的认识。通过研究烃源岩的分布和规模,确定它们的数量;通过研究烃源岩的有机质数量、质量,以及热演化程度,确定主力烃源岩;通过研究原油的物性、地化特征和成因,确定各种成因原油的特征、分布区带;通过研究油气、烃源岩特征,进行油油对比和油岩对比,确定油气运移的方向;根据不同天然气成因及特征,确定阿尔凹陷甲烷气、二氧化碳气、硫化氢气体等的成因和来源;通过油、气-岩对比,研究其运聚特征,揭示油、气运聚规律,为寻找规模储量提供依据;通过对阿尔凹陷资源量的计算,预测剩余资源分布。最终为该区域进一步勘探开发提供技术支持。最终研究表明,阿尔凹陷发育了阿尔善组和腾一段两套优质成熟烃源岩,生油门限的位置相当于腾二段的下部,深度仅有1250m,因此从古生界至腾一段层系中,只要圈闭条件有利,均可能聚集成藏。
[Abstract]:The single sag in Erlian Basin is characterized by small scale of resources, rapid changes of sand bodies, large difference in physical properties, complex oil and gas reservoir forming conditions and reservoir forming conditions, which determines that the "sag replacement" is the dominant feature in increasing the reservoir. However, the old sag has been improving better than the level of exploration progress, and has put forward higher requirements for searching for the whole set of reserves. In order to achieve the goal of oil and gas reserve formation in Erlian area, the geological personnel change the research ideas of the new area and focus on the low exploration area around the Erlian basin. Boldly conduct a search study of the unexplored Al sag in the Bayin Baoliger uplift near the border between China and Mongolia, which has completed a total of 400.4 square kilometers of 3-D earthquakes. The area with mineral rights is basically covered by three dimensional earthquakes; 29 exploration wells of various types have been completed; 7 of the systematic single well geological analysis have been carried out; and the core, cuttings, crude oil and natural gas of scattered wells have also been analyzed. More than 5000 samples were analyzed in 12 projects of more than 20 wells. Through fine sample analysis and systematic data processing, the distribution, source, migration and accumulation characteristics of oil and gas in the sag were analyzed. By studying the distribution and scale of source rocks, the quantity of source rocks is determined, and the main source rocks are determined by studying the quantity, quality and thermal evolution of organic matter of source rocks. Through studying the physical property, geochemical characteristics and origin of crude oil, the characteristics and distribution zone of various genetic crude oils are determined, and the direction of oil and gas migration is determined by studying the characteristics of oil and gas and source rock, and oil and oil correlation and oil rock correlation. According to the origin and characteristics of different natural gas, the origin and source of methane gas, carbon dioxide gas and hydrogen sulfide gas in Al sag are determined, and the migration and accumulation characteristics of oil and gas are studied by comparing oil, gas and rock to reveal the law of oil and gas migration and accumulation. It provides the basis for finding the scale reserves, predicts the distribution of the remaining resources through the calculation of the amount of resources in Al sag, and finally provides technical support for the further exploration and development of the area. The final research shows that, Two sets of high quality mature hydrocarbon source rocks were developed in Arshan formation and Tengyi formation. The position of the source oil threshold is equal to the lower part of the second member of the formation, and the depth is only 1250m.Therefore, from Paleozoic to Tengyi formation, as long as the trap conditions are favorable, It is possible to gather into a reservoir.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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