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油气化探中地表地球化学异常大量呈环形分布。在二连盆地桑根达来工区进行地表化探中，发现不同地球化学指标形成的地球化学异常在空间分布上表现为正环形组合和反环形组合。文中结合石油地质条件，通过数字模拟和异常形成的时间序列分析得出：正环形异常组合表示油气向地表微渗漏持续进行，下部可能存在工业聚集的油气藏；反环形异常组合表示油气向地表微渗漏正在减弱，历史上曾经存在的油气藏已经消失
Geochemical anomalies in oil and gas geochemical exploration showed a large number of annular distribution. It is found that the geochemical anomalies formed by different geochemical indicators appear as the combination of positive and anti-ring in the spatial distribution. According to the petroleum geological conditions, the time series analysis of digital simulation and anomaly formation shows that the positive anomalous combination indicates that the micro-seepage of oil and gas to the surface continues and the lower part may have industrial accumulation; Microleakage is declining, and historically existing reservoirs have disappeared