川西坳陷中段丰谷构造须家河组二段致密砂岩储层油气预测方法研究

致密砂岩的油气预测是国内外油气勘探的重大难题，由于川西坳陷须家河组二段砂岩储层的致密性，形成并发展了以裂缝预测为主的诸多油气预测方法和技术，但实际效果仍然欠佳，作者以丰谷构造为例，以成藏条件及主控因素分析为基础，通过构造恢复，油气水及四史（沉积史、生烃史，热史，孔隙演化史）研究，剖析聚集期古构造的成藏过程，指出以聚集期隆起为主要线索的早期圈闭是须二气藏最有效的勘探目标，在此基础上，运用地震多参数预测，压力预测等地震油气识别技术，预测有利储集区域，提供建议井位，预测结果与实钻结果吻合，研究成果已用于勘探和开发部署中。

PREDICTION METHODS OF OIL AND GAS PREDICTION ABOUT THE COMPACT SANDSTONE OF T3x2 IN MIDDLE OF WEST SICHUAN DEPRESSION TAKING THE FENGGU STRUCTURE AS EXAMPLE

The prediction of oil and gas in compact sandstone is a momentous puzzle of the petroleum exploration , both domestically and abroad. Beacuse of the compact characteristic of the T 3x 2 sandstone on the Longmen mountain leading edge in the middle of West Sichuan depression, the prediction methods of oil and gas prediction, giving priority to crack prediction, have been developed. But their actual effect is not ideal. The paper takes the Fenggu structure in the middle of West Sichuan depression as example to use structure recovery to analyze the characteristic of structure evolution and points out the place where the ancient oil and gas gather. On the basis of formation conditions of the reservoirs and principal factor analysis , with the history study of structure evolution, oil gas water, sedimentary, hydrocarbongenesis, thermal and pore evolution, the paper dissects the process of reservoir formation of the ancient structure when oil and gas gather and points out that the most effective exploration target of the T 3 x 2 compact sandstone is the inchoate trap which principal clue is the anticline in the course of oil and gas gathering. On the basis of the above, with the seismic recognition techniques of oil and gas reservoirs, such as seismic multi parameter prediction, pressure prediction, the paper predicts the zone of favorable reservoir and the place of wells. Its prediction result coincides with the actual result. And the payoff has been used in the disposition of development and exploration.