多介质立体取样及在北黄海油气化探中的应用

TRI-DIMENSIONALLY MULTI-MEDIA SAMPLING AND ITS APPLICATION IN THE HYDROCARBON GEOCHEMICAL EXPLORATION IN THE NORTH YELLOW SEA BASIN

由于不同环境条件下,不同化探测试指标受到不同的因素干扰,所以不同介质样品的应用条件存在一定的差异。针对不同介质样品特点,分别采集海底沉积物、底部海水和低空大气3种介质样品,并采用在海底沉积物柱状样不同深度部位取样的立体取样方法,通过多指标综合分析,对不同介质和深度样品的多项化探指标互相进行了验证和补充,可以抑制干扰因素的影响,为油气资源远景评价提供依据。运用该方法在北黄海盆地油气勘查中进行初步尝试,并据此划分了三级化探异常区,提出了有利的含油气远景区,均与已知油气区和区域地质分析的结果相符合,取得了很好的效果。

Under the different environment conditions, the availability of the geochemical indicators is largely affected by different factors, thus leading to the differences of the application for different media samples. Being aimed at the characteristics of different media samples, the samples from marine bottom sediments, bottom seawater and lower air were collected by using the tri-dimensionally multi-media sampling method. By using this useful sampling method, as well as the multi-indicators integrative analysis, the results of the samples from different media and depth can be validated and reinforced and the disturbing effects of different factors could be well eliminated. The result can provide the foundation for hydrocarbon resource evaluation. By using this method in the North Yellow Sea Basin, three classes of geochemical anomalous areas have been determined and several potential hydrocarbon targets have been brought forward, which have the good correlation with existing oil and gas areas and geological analytical results.