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油气化探工作要遵循先区域后局部、调查比例尺由小到大的原则，在不同的勘查阶段圈定不同级次的异常，逐渐逼近油气藏的空间范围。不同阶段测量精度决定了所发现化探异常的油气地质意义：概查阶段应在盆地背景上圈定区域异常，查明盆地的含油气远景；普查阶段应在区域背景上圈定区带异常，查明油气富集的有利区带；详查阶段应在地区背景上圈定局部异常，查明圈闭的含油气性；精查阶段应在局部背景上圈定矿置异常，查明油气藏的存在与位置。各级次化探异常之间具有依次控制的关系，前两类化探异常属于宏观异常，与油气藏的关系是不甚确切的，后两类异常则反映了油气藏的具体特征。应用不同级次异常的概念，在我国海域和陆地的诸多盆地中进行的化探工作，为油气勘探、开发提供了信息和依据，取得了良好的地质效果。图４表６参４（梁大新摘）
Oil and gas geochemical exploration work should follow the first part of the region after the survey scale from small to large principle, in different exploration stages delineation of different levels of anomalies, gradually approaching the spatial extent of the reservoir. The measurement accuracy at different stages determines the geologic significance of the geochemical anomalies discovered in the oil and gas exploration. During the survey stage, the regional anomalies should be delineated on the background of the basin and the hydrocarbon potential of the basin should be identified. During the census stage, the regional anomalies should be delineated In the detailed investigation stage, local anomalies should be delineated to identify trapped oil and gas; during the investigation stage, the mineralization anomaly should be delineated on the local background to ascertain the existence and location of oil and gas reservoirs . The geochemical anomalies at all levels have sequential control relationship. The first two types of geochemical anomalies belong to the macro-anomaly, and the relationship with the reservoir is not exact. The latter two types of anomalies reflect the specific characteristics of the reservoir. Applying the concept of different levels anomalies, the geochemical exploration carried out in many basins in China’s sea area and on the land provides information and basis for oil and gas exploration and development and has achieved good geological results. Figure 4 Table 6 Reference 4 (Liang Daxin Abstract)