沾化凹陷罗家地区岩浆活动对油气形成的影响  

Magma activity's influence on oil gas generating in Luojia area of Zhanhua sag

作　　者：贾京坤[1] 万丛礼[2] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石化股份胜利油田分公司油气集输总厂,山东东营257000

出　　处：《油气地质与采收率》2012年第6期50-52,114,共3页Petroleum Geology and Recovery Efficiency

摘　　要：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 region where there are abundant magma rocks has become important exploration fields for oil and gas,but the oil-gas origin in the region is very complicated.The intense magma activities took place ever in Luojia area of Zhanhua sag where rich oilgas with abnormal chemical properties is accumulated.By cores and log interpretation,we determined the type and orientation of the magma rocks,then,studied source rock's petrology nearby the magma rocks,and then verified the source rock thermal metamorphism and organic carbon mineralization.By means of chemical analysis,we found that the source rocks' maturity is very high and experienced abnormal change,as well as higher H2S and CO2 in oil-gas.We may infer that the magma rocks,on the one hand,accelerated organic matter thermal evolution in the source rocks as well as the hydrocarbon generation,on the other hand,they caused the carbonate and sulfate decomposition,generating inorganic H2S and CO2.In the end,we indicate that the magma activities are causes of oil-gas enrichment and abnormal properties,and suggesting that the magma rocks should be accountable of the oil-gas origin and exploration and development.

关 键 词：岩浆活动 油气形成热作用 罗家地区 沾化凹陷 

分 类 号：TE112.11[石油与天然气工程—油气勘探]