川东地区石炭系碳酸盐岩薄储层的横向预测

LATERAL TREND PREDICATION ON THIN CARBONIFEROUS CARBONATE RESERVOIRS IN THE EAST OF SICHUAN PROVINCE

四川石油管理局地调处,成都610212

Geology Survey Division of Sichuan Petroleum Management Bureau, Chengdu, 610212

以川东地区高峰场构造石炭系碳酸盐岩薄储层为例,结合川东地区钻井、测井资料,论证了用地震方法预测石炭系碳酸盐岩薄储层的可能性,阐明了预测的步骤、方法和效果。预测方法要强调针对川东地区特点,尽量减轻陡界面资料叠加对子波波形的影响;充分发挥碳酸盐岩发育地区地震波高频成份衰减少的优势,提高地震剖面的分辨率。用具有足够分辨力的地震剖面,对碳酸盐岩薄储层进行横向预测,可收到满意的效果。四川盆地广泛存在川东式(或类)石炭系碳酸盐岩薄储层,地震横向预测的前景远大。

This paper demonstrates the feasibility of predicting thin Carboniferous carbonate reservoirs with seismic methods based on an applied example on Gao Fen Chang structure in the east of Sichuan province in combination with the relevant drilling and logging data in the same area. The procedure, methodology and effectiveness of the technique in practice are also described, in which emphasis is given to alleviating the influence from stacking processes related to the data over steep structures on the waveform of wavelets as far as possible, and making use of the feature of less high-frequency attenuation in carbonate areas to improve the resolution for seismic sections. Seismic sections with good resolution will be a great help to the lateral trend predication for thin carbonate reservoirs. Since such a pattern of reservoir can be found everywhere in Sichuan Basin, the technique described here will definitely find application in predicting the trend of lateral extension for reservoirs.