东营凹陷永新地区古近系油气运聚规律及成藏模式研究
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摘要
利用油气地质、地球物理、地球化学等资料,在永新地区断块油气藏基本地质特征和构造特征分析的基础上,重点对研究区的油气来源、输导体系特征、油气运移以及成藏模式进行了研究。通过对烃源岩及永新地区已发现原油(包括油砂)的地化特征分析,认为永安镇油田的原油主要为民丰洼陷沙四上烃源岩供烃及沙四上和沙三下两套烃源岩混合供烃;新立村油田主体的原油主要为本区下覆沙四上亚段烃源岩供给,南部临近牛庄洼陷的原油为牛庄洼陷沙四上及沙三下烃源岩混合供烃;纵向上,生烃层系的原油主要为本层系供烃,而非生烃层系的原油多为混源油。永新地区的油气输导体系主要由砂体和断层组成,其中沙三上、沙二下和沙二上砂体为研究区三套主要的骨架砂体;通过对断层生长指数的计算及其与油气成藏期的对比分析,认为永安镇油田的二级断层为重要的油气垂向运移通道,而新立村油田只有永105断层的中部对油气具有垂向输导作用,南部的小断层封闭性较强,油气在断砂复式输导下运聚成藏。综合精细油源对比、油气输导体系及运移方向的研究,建立了三种油气成藏模式,即“阶梯式运移”成藏模式、“垂向运移”成藏模式和“侧向运移”成藏模式。最后,系统分析了油气的分布规律和影响因素,认为断层的级别、活动性及其与砂体的组合关系对油气藏的形成和分布具有重要的控制作用。
With the comprehensive research methods of geology, geochemistry and geophysics, On the ground of diagnosing the basic geologic and structural characteristics of the fault block hydrocarbon reservoir in Yongxin area, the resource of the hydrocarbon, the characteristics of conducting system, the hydrocarbon migration and the model for reservoir-forming are mainly studied. According to the summary of source rock geochemical property in Minfeng sub-sag,Niuzhuang sub-sag and Yongxin area, associating the analysis about the geochemical property of discovered oil(including oil-bearing sand) in Yongxin area,it is judged that the oil in Yong’anzhen oil field is mainly provided by Es4s or the mixture of the Es3 and the Es4s ource rocks in Minfeng sub-sag,and the oil in Xinlicun oil field is mainly from Es4s source rock which has already been up to oil threshold under the area, the oil in the south of Xinlicun oil field is provided by the mixture of the Es4s and Es3x source rocks in Niuzhuang sub-sag. In the longitudinal section,the oil in the oil generative assemblage is mainly provided by the source rock in its own layer, while the oil being not in the oil generative assemblage is mainly from the mixture of the source rocks. The conducting system in Yongxin area is made up of sand bodies and fault, the main framework sand bodies are Es3s,Es2x and Es2s. Second order fault in Yong’anzhen oil field is the main vertical pathway for hydrocarbon migration, while hydrocarbon migrates in vertical. only on the middle of Yong 105 fault in Xinlicun oil field, the little faults in the south are sealing faults, hydrocarbon accumulates because of the assemblage of faults and sand bodies. With the studying of oil and source rock correlation, migration pathway, petroleum migration., three kind of pool-forming models are established: notching migration model, vertical migration model and lateral mingration model. At last, distribution regular of oil and its influential factor are systematic analysis, it is think that the level, activity of faults along with the assemblage of faults and sand bodies have the important effect on the forming and the distribution of petroleum reservoir.
With the comprehensive research methods of geology, geochemistry and geophysics, On the ground of diagnosing the basic geologic and structural characteristics of the fault block hydrocarbon reservoir in Yongxin area, the resource of the hydrocarbon, the characteristics of conducting system, the hydrocarbon migration and the model for reservoir-forming are mainly studied. According to the summary of source rock geochemical property in Minfeng sub-sag,Niuzhuang sub-sag and Yongxin area, associating the analysis about the geochemical property of discovered oil(including oil-bearing sand) in Yongxin area,it is judged that the oil in Yong’anzhen oil field is mainly provided by Es4s or the mixture of the Es3 and the Es4s ource rocks in Minfeng sub-sag,and the oil in Xinlicun oil field is mainly from Es4s source rock which has already been up to oil threshold under the area, the oil in the south of Xinlicun oil field is provided by the mixture of the Es4s and Es3x source rocks in Niuzhuang sub-sag. In the longitudinal section,the oil in the oil generative assemblage is mainly provided by the source rock in its own layer, while the oil being not in the oil generative assemblage is mainly from the mixture of the source rocks. The conducting system in Yongxin area is made up of sand bodies and fault, the main framework sand bodies are Es3s,Es2x and Es2s. Second order fault in Yong’anzhen oil field is the main vertical pathway for hydrocarbon migration, while hydrocarbon migrates in vertical. only on the middle of Yong 105 fault in Xinlicun oil field, the little faults in the south are sealing faults, hydrocarbon accumulates because of the assemblage of faults and sand bodies. With the studying of oil and source rock correlation, migration pathway, petroleum migration., three kind of pool-forming models are established: notching migration model, vertical migration model and lateral mingration model. At last, distribution regular of oil and its influential factor are systematic analysis, it is think that the level, activity of faults along with the assemblage of faults and sand bodies have the important effect on the forming and the distribution of petroleum reservoir.
引文
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