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烃类微渗漏与宏渗漏的识别可提高化探异常解释的正确性,对识别标志研究现状进行了综合分析,表明微生物、罐顶气、酸解烃、土壤气对2类渗漏有不同响应。宏渗漏多具有微生物及烃检测异常指标呈线状分布、烃浓度高、C6+多、烷烃/烯烃值高的特征;而微渗漏多具有微生物异常指标呈散乱分布、烃浓度低、几乎无C6+、烷烃/烯烃值低的特征。对四川盆地南大巴山冲断褶皱带内的镇巴区块长岭—龙王沟地区展开研究,表明龙王沟异常带具有土壤丁烷氧化菌及酸解烃C1—C4异常点线状分布、C1—C4浓度高(>1 000×10-6)、乙烷/乙烯值高(>10)的特征,为宏渗漏,与下伏油气藏可能不垂直对应;长岭复向斜异常带具有土壤丁烷氧化菌异常点散乱分布、C1—C4浓度低(<100×10-6)、乙烷/乙烯值低(<5)的特征,为微渗漏,与下伏油气藏垂直对应。
The identification of hydrocarbon microleakage and macroleakage can improve the correctness of geochemical anomaly interpretation, and the comprehensive analysis of the research status of identification markers shows that microorganisms, tank top gas, acidolysis and soil gas have two kinds of leakage Different response. Most macroleaks have the characteristics of linear distribution of microorganism and abnormal hydrocarbon detection, high hydrocarbon concentration, high C6 +, high alkane / alkene value, while microleakage has many indicators of microbial abnormally scattered, low hydrocarbon concentration, almost no C6 +, low alkane / alkene character. The study on the Changling-Longwanggou area in the Zhenba block within the South Dabashan thrust fold zone in the Sichuan Basin shows that the anomalous zone of the Longwanggou has linear distributions of C1-C4 anomalous sites in the soil butane oxidation bacteria and C1- The characteristics of high concentration of C4 (> 1000 × 10-6) and high ethane / ethylene (> 10) are macroleakage, which may not correspond vertically with the underlying oil and gas reservoirs. The anomalous zone of Changling synclinorium has soil Butane oxidation bacteria are scattered randomly, with low concentration of C1-C4 (<100 × 10-6) and low ethane / ethylene (<5).