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通过鄂尔多斯南部彬长地区延长组的测井数据分析、岩性解释、地球化学特征及其油源对比分析等资料来研究该区长9的成藏模式。已有的油源对比结果显示,长9成藏来自于长7段张家滩页岩油气的倒灌运移成藏。为了确定该区成藏模式,在该区具有良好的断层运移通道的基础上,对石油的运移条件,动力来源,储集条件进行研究分析。结果表明:“张家滩”油页岩生烃增压产生的过剩压力、与下伏储层源储压差是长7段石油向下伏储层运移的主要动力;源内烃源岩生成的大量石油,在源储压差的作用下通过油源断层向下运移至有效圈闭内成藏,建立彬长地区长9“上生下储”式成藏模式。
Based on the logging data analysis, lithology interpretation, geochemical characteristics and oil source contrast analysis of the Yanchang Formation in Binchang area, southern Ordos, the accumulation pattern of Chang 9 reservoir was studied. The existing oil source comparison results show that the Chang 9 reservoir formed from the Chang 7 Member Zhangjiatan shale hydrocarbon migration and accumulation. In order to determine the mode of hydrocarbon accumulation in this area, the migration conditions, the sources of power and the reservoir conditions of petroleum are studied and analyzed on the basis of good fault migration path in this area. The results show that the excess pressure caused by hydrocarbon generation and pressurization in the Zhangjiatan oil shale and the pressure difference between the source and reservoir in the next reservoir are the main driving forces for the migration of the oil in the Chang 7 segment to the lower reservoirs. A large amount of oil generated from rocks migrates downward into the effective trapping reservoir through the source faults under the action of source-reservoir pressure difference, and establishes a reservoir-forming model of Changshang 9 area.