波形指示反演对岩性油藏边界识别的指导作用

The guiding effect of waveform indication inversion on lithologic reservoir boundary identification

南海东部H油田是南海东部地区首个已开发的以构造-岩性油藏为主的中型油田,其中主力油藏L层是典型的构造-岩性油藏。在地震分辨率限制下,常规阻抗反演、地震属性无法落实L层1~3米薄层砂体分布规律,为了解决该问题,引入了相控波形指示反演技术预测薄砂体展布。波形指示反演是在充分利用地震反射波横向波形变化与沉积相相关的特点,比常规随机反演和传统阻抗反演得到的结果更具确定性。波形指示反演在H油田薄层砂岩油藏滚动扩边方面,取得了较好的效果。

The H oilfield in the Eastern South China Sea is the first developed medium-sized oilfield dominated by structural-lithologic reservoirs in the Eastern South China Sea.The main reservoir L is a typical structural-lithologic reservoir.Under the limitation of seismic resolution,conventional impedance inversion and seismic attributes cannot implement the distribution thin sand bodies in L.In order to solve this problem,this paper introduces the waveform indication inversion to predict the distribution of thin sand bodies.Waveform indicator inversion is to make full use of the characteristics of seismic’s lateral waveform changes related to sedimentary facies,is more deterministic than conventional random inversion and impedance inversion..The waveform indication inversion has achieved good results in the rolling expansion of thin sand reservoirs in H oilfield.