地震探鉱技術を使った地質リスク評価と不確実性評価

抄録

This paper was created to make a record of the lecture in the exploration technology symposium, June

2017.

In this lecture, uncertainties in geophysical evaluation were highlighted when making the geological risk assessment and estimating prospective resources. In this paper, recent technologies in the seismic industry are not described. But, some of good examples are provided for geophysicists to carefully evaluate the uncertainties attributed to the seismic data and support data such as wireline data and seismic velocity data. 1）The uncertainties in the seismic imaging caused by the statics correction and by lateral thickness changes of high velocity sediment, 2）the uncertainties in horizon picking on the laterally variable wavelets by changing fluid contents in the reservoirs, 3）the quality of the support data, 4）the uncertainties and errors in the depth conversion using the layer cake velocity model, and 5）utilizing multiple seismic attributes applicable to predict good reservoirs should be thoroughly investigated in conjunction with not only mathematical solution, but also the geoscientific solution including the regional geological setting.

Also it was highlighted concerning the adjustment of geological “Chance of Success” in accordance with “Direct Hydrocarbon Indication”.