摘要:
油田水体系的地球化学场中蕴含着丰富的石油地质学含意,其研究对指导油气勘探和开发有重要的意义。辽河盆地西部凹陷欢—双地区下第三系油田水可划分为六个体系,即:(1)沙四段油田水体系,(2)沙三段下部油田水体系,(3)沙三段中—上部油田水体系,(4)沙二段油田水体系,(5)沙一段油田水体系和(6)东营组油田水体系。虽然这六个体系的油田水均为低矿化度的重碳酸钠型水,但其矿化度和还原系数场不尽相同;这些不同不仅表现在油田水体系之间的地球化学场异常区面积有差异,而且地球化学场异常区位置也有变化。一般认为油田水体系中矿化度场的正异常区和还原系数场的负异常区为有利的油气聚集区和保存区。
关键词:
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油田水 /
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矿化度 /
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还原系数 /
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辽河盆地
Abstract:
There are plenty of petroleum geology implications in geochemical fields of oil field water systems. It is very important for studying the geochemical fields to guide exploration and development of petroleum. Oil field waters of Eogene System in Huanxilin Shuangtaizi area, the Western Depression, Liaohe basin, can be divided into six oil field water systems. The oil field water systems are:(1) the oil field water system of No.4 Section of Shahejie Formation, (2)the oil field water system of lower No.3 Section of Shahejie Formation, (3)the oil field water system of middle upper No.3 Section of Shahejie Formation, (4)the oil field water system of No.2 Section of Shahejie Formation, (5)the oil field water system of No.1 Section of Shahejie Formation, (6)the oil field water system of Dongying Formation. Though the types of all oil field water of the six systems in Huanxilin Shuangtaizi area, Western Depression, Liaohe basin are the low mineralized bicarbonate sodium, it is very different among mineralization intensity fields and reduction factor fields in the six oil field water systems. The differences are not only the different abnormal areas of the geochemical fields in the six oil field water systems, but the different locations of abnormal areas of the geochemical fields among the six oil field water systems also. The abnormal areas are represented their petroleum geology implications in the six oil field water systems respectively. Generally, the positive abnormal areas of mineralization intensity and the negative abnormal areas of reduction factor in oil field water system have the advantage of petroleum to be accumulated and reserved. The geochemical fields of oil field water systems of Eogene System in Huanxilin Shuangtaizi area, Western Depression, Liaohe basin don't show the consistent of the conditions of petroleum accumulation and reservation in the sections and formation of Eogene System in the study area.
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