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随着勘探程度的不断提高，未发现的大型构造油气藏已越来越少，因而寻找隐蔽的岩性油藏是一项紧迫的任务．利用地震资料识别岩性是完成这一任务的关键．已有的预测岩性的方法都要求地层厚度在调谐厚度以内，对厚层无法准确预测．而利用反射波负半周面积与正半周面积的比值及频域参数能较准确地预测砂、泥岩的厚度，即使其厚度大于调谐厚度也适用
With the continuous improvement of exploration, there are fewer large-scale structural reservoirs that have not been discovered. Therefore, finding hidden lithologic reservoirs is an urgent task. The use of seismic data to identify lithology is the key to accomplish this task. Existing methods of predicting lithology require that the thickness of the formation be within the tuned thickness and that the thick layer can not be accurately predicted. The thickness of sand and mudstone can be more accurately predicted by the ratio of the negative half-circumference area to the positive half-circumference area and the frequency domain parameter, even if the thickness is larger than the tuning thickness