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沾化凹陷罗家地区岩浆活动强烈,油气资源丰富,但油气性质异常,岩浆活动对油气形成的影响有待于进行深入研究。根据岩心观察和测井解释结果,首先确定罗家地区岩浆岩的类型和产状等,然后对岩浆岩周围的烃源岩进行分析,证实了岩浆岩的热作用使周围烃源岩发生热变质及有机质炭化。应用化学方法研究,发现岩浆岩周围的烃源岩成熟度非常高且变化大,油气中具有较高含量的硫化氢和二氧化碳。分析认为,岩浆活动明显促进了周围烃源岩中有机质的热演化以及油气形成,并导致硫酸盐和碳酸盐矿物分解,生成硫化氢和二氧化碳。岩浆活动是罗家地区油气丰富、油气性质异常的重要根源,研究其油气成因应充分考虑岩浆因素,且在油气开发过程中应预防硫化氢对人员和设备的伤害。
The magmatic activity in Luojia area of Zhanhua sag is very strong with abundant oil and gas resources, but the nature of oil and gas is abnormal and the influence of magmatic activity on the formation of oil and gas needs to be further studied. According to the results of core observation and log interpretation, the type and occurrence of magmatic rocks in Luojia area were determined first, and then the source rocks around magmatic rocks were analyzed to confirm that the thermal effect of magmatic rocks resulted in the thermal deterioration of the surrounding source rocks And carbonized organic matter. Using chemical methods, it has been found that the maturity of source rocks around magmatic rocks is very high and variable, with high content of hydrogen sulfide and carbon dioxide in the oil and gas. The analysis shows that magmatic activity significantly promoted the thermal evolution of organic matter and the formation of oil and gas in the surrounding source rocks, resulting in the decomposition of sulfate and carbonate minerals and the formation of hydrogen sulfide and carbon dioxide. Magmatic activity is an important source of oil and gas richness and abnormal oil and gas properties in Luojia area. It is necessary to fully consider the magmatic factors when studying the genesis of oil and gas, and to prevent the harm of hydrogen sulfide to personnel and equipment in the process of oil and gas development.