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陆相湖盆中的薄层生物灰岩是一个被忽视的油气勘探的重要领域。由于层薄、横向变化大以及埋藏深,用单一、常规的方法难以预测。通过对孤北斜坡区薄层生物灰岩的预测实践,提出了利用测井组合和地震反演联合预测薄层生物灰岩的方法——测井组合识别-地震联合反演法,其基本思路是:首先利用钻井、录井资料建立测井组合曲线综合识别薄层生物灰岩的判别模式,其次将判别模式识别出生物灰岩的井参与高精度的岩性反演,从井出发依据生物灰岩在反演剖面上的表现特征向四周延伸追踪,由此可获得薄层生物灰岩的平面展布特征。
Thin-layer biogenic limestone in the continental lacustrine basin is an important area of neglected oil and gas exploration. Due to thin layers, large lateral variations and deep burial, it is difficult to predict with a single, conventional method. Based on the prediction practice of the thin bio-limestone in the Gubei slope area, a method combining well logging and seismic inversion to predict thin-bed bio-limestone is proposed, which is log combination identification-seismic joint inversion method. The basic idea Is: Firstly, the discriminant pattern of comprehensive identification of thin-bed bio-limestone is established by well logging and logging data. Secondly, the well of bio-limestone is identified by discriminant mode, and lithology inversion with high accuracy is performed. The characteristics of limestone in the inversion section are traced to the periphery, and the planar distribution characteristics of the thin bio-limestone can be obtained.