APPLICATION OF THIN LAYER LITHOLOGICAL RESERVOIR PREDICTION TECHNOLOGY FOR VARIABLE-DEPTH STEAMER SEISMIC IN PEARL RIVER MOUTH BASIN
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摘要:
珠江口盆地惠州凹陷南缘发育典型的辫状河三角洲水下分流河道沉积砂体，其特点是厚度薄，横向变化快。目前基于常规地震资料开展的储层预测研究难以准确落实其砂体展布、岩性边界及储层厚度。相比于常规采集地震资料，斜缆宽频地震资料拥有更高的信噪比、保真度、分辨率和更宽的频带等优势。以H油田典型薄层岩性油藏为例，基于斜缆宽频地震资料，利用叠前反演技术开展储层预测研究，并且刻画了储层内部结构及砂体空间叠置关系。预测结果准确落实了岩性边界真实位置，砂体厚度预测与实际钻井资料吻合度达到80%。表明斜缆采集宽频地震数据的储层预测技术可为薄层岩性油藏钻井开发提供有效指导，也有望在海上薄层岩性圈闭评价工作中得到推广。
Abstract:Underwater distributary channel sand bodies, a typical kind of braided river delta deposits, characterized by thin thickness and fast lateral variation, are well developed in the southern margin of Huizhou Sag, Pearl River Mouth Basin. At present, the reservoir prediction research based on conventional seismic data is difficult to accurately disclose the sand body distribution pattern, define the lithological boundaries and reservoir thickness. Taking the typical thin-layered lithological reservoir in H oilfield as an example, this paper introduces the advantages of oblique cable broadband seismic survey. Compared to conventional seismic data acquisition, variable-depth steamer broadband seismic data has higher signal-to-noise ratio, fidelity, higher resolution and wider frequency band. Based on the broadband variable-depth steamer seismic, the reservoir prediction research is carried out by using pre-stack inversion technology. The predicted results accurately defined the real position of lithological boundary, and the coincidence degree of sand body thickness prediction with actual drilling is up to 80%. Then the internal structure of the reservoir and the spatial superposition relationship of sand bodies are described, which provides effective guidance for drilling and development of thin-layered lithological reservoirs. Reservoir prediction technology based on broadband seismic data acquired by inclined cable is expected to be popularized in the evaluation of offshore thin lithological traps.
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