四川盆地西部油气资源潜力

OIL AND GAS POTENTIAL IN WEST SICHUAN BASIN

随着油气勘探开发工作向纵深推进 ,四川盆地西部致密碎屑岩领域积累了大量新资料 ,需要根据新的资料滚动式的评价其油气资源潜力。通过运用盆地模拟技术 ,在对烃源岩有机质丰度、类型、成熟度、生烃潜力等进行系统砚究的基础上 ,采用有机碳法、有机显微组分法等计算了该区生烃量 ,并根据排聚系数计算出该区天然气资源量为 (1.8～ 2 .5 )× 10 12 m3 ,资源量同过去相比增加了 2～ 3倍 ,现有探明天然气储量 2 2 0 0× 10 8m3 仅占其资源量的 10 %左右 ,探明程度明显偏低。因此 ,该区油气探明储量仍将有一个持续增长期 ,勘探潜力十分巨大。

Along with promoting the projects of oil & gas exploration and development, a great number of new data has been gathered in the area of dense petroclastics in West Sichuan Basin, where oil and gas potential could be appraised incessantly with the help of these data. Based on overall study on the abundance, types, maturity and genetic potential of organic matter, some methods, such as TOC (Total Organic Carbon Method) and Maceral, were used with the simulation technique on Basin to calculate the hydrocarbon genetic content there. Then according to accumulation coefficient, the gas content there was calculated up to 1.8 - 2.5 thousand billion cubic meters, from twice to three times as much as before. It is found that the explored gas reserves is up to 220 billion cubic meters, accounting for only about 10% of the total reserves, which shows exploration is still on a relatively low level. Therefore, it is obviously seen that the explored oil and gas reserves will keep on growing in the long-term future and so the exploration potential is extremely great.