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低阻油层形成的主控因素和成因机理是近年来石油地质研究的热点问题。对低阻油层的成因机理分析是低阻油层识别的关键,也是一大难题,只有正确分析其成因,才有可能探索有效识别低阻油层的方法,发现潜在油层,为老井区挖潜提供依据,同时也为类似地质条件下的其它油田的油层判识提供参考。为此,笔者以岩石物理研究为基础,以测井响应特征为对象,对川口油田川46井区长6~1低阻油层的成因机理进行详细分析。研究表明,川46井区长6~1油层具有储层薄、粒度细、高束缚水饱和度、高矿化度地层水及高泥质含量的特点,是低阻油层形成的主控因素。此外,高放射性砂岩和钻井液的侵入,在测井曲线响应中,同样表现为相对低阻的特征。
The main controlling factors and genesis mechanism of low resistivity formation are the hot issues of petroleum geology in recent years. The analysis of genetic mechanism of low-resistivity reservoirs is the key to identify low-resistivity reservoirs. It is also a major challenge. Only by correctly analyzing its causes, it is possible to explore ways to effectively identify low-resistivity reservoirs and to find potential reservoirs to provide evidence for potential tapping in old wells , But also provide references for reservoir identification in other oilfields under similar geological conditions. Therefore, on the basis of petrophysical research, the author analyzes the genesis mechanism of low resistivity reservoirs of 6-1 in the Sichuan-46 well of the Kawaguchi oilfield based on the logging response characteristics. The results show that the reservoir of Chang 6-1 in Chu 46 has the characteristics of thin reservoirs, fine grain size, high irreducible water saturation, high salinity formation water and high shale content, which are the main controlling factors for the formation of low resistivity reservoirs. In addition, the intrusion of highly radioactive sandstones and drilling fluids also behave as relatively low-resistive features in logging response.