Research And Apply Of FLAIR Logging Gas Interpretation In Baiyun Depression

FLAIR logging system is much more improved than traditional gas chromatograph in analysis technology and method. The detected hydrocarbon components of traditional gas chromatograph analysis technology include C1、C2、C3、iC4、nC4、iC5 and nC5, however except for the above components, those detected by FLAIR logging system are extended to nC6、nC7、nC8、C6H6,C7H8、C7H14 and non-hydrocarbon CO2 and H2 S etc. The key to develop FLAIR logging is how to make the best of these extended components to serve gas interpretation and oilfield exploration & exploitation.With the use of deepwater drilling rig COSL HYSY981, deepwater exploration of offshore oil enters into the large-scale exploration and development period. Summarizing deepwater interpretation chart and model is of great significance for Baiyun depression, especially for deepwater area.From a statistical point of view, the 243-layer reservoirs of the dilled wells in Baiyun depression are analyzed. By each parameter characteristic of gas components, methods of component trend lines, total hydrocarbon-FLAIR types and multiple anomalies are suggested for rapid identification of oil and gas layers. By comparing the three methods, the effect is very satisfactory that the coincidence rate of multiple anomalies is the highest. Compared with well testing and electric sampling, the coincidence rate is 92.3% and only three layers are not in accordance. For the case of useless CO2 gas detector in deep wells(depth>1500m), comprehensive interpretation methods of CO2 gas reservoir identification are proposed by mud logging, electric logging and mud analysis.