APPLICATION RESULTS OF OIL AND GAS GEOCHEMICAL TECHNIQUE IN OIL AND GAS EXPLORATION IN TARIM BASIN

A study on surface and down-hole geochemical exploration techniques has been carried out in the Northern Tarim basin, and large scales of surface and down-hoe geochemical explorations have been conducted in this area since the middle of the 1980s. Oil and gas geochemical exploration results of Tarim Basin accumulated in the past 20 years indicate that there exist obvious geochemical anomalies over the known oil/gas reservoirs, and the anomaly patterns are mainly ring-like halos or half rings. Geochemcal exploration in the unknown areas also achieved good effects in the aspects of prediction of the prospects, delineation of geochemical anomalies and evaluation of geochemical evaluation. Quite a lot of geochemical anomalies delineated in the unknown area have been verified with commercial oil/gas flows by drillings. Down-hole geochemical exploration shows good exploration results in the aspects of in-situ prediction and identification of oil/gas show layers.