基于低频模型优化的相控地质统计学反演方法及应用

doi:10.7657/XJPG20230316

摘要/Abstract

摘要：

吐哈盆地台北凹陷葡北地区中侏罗统七克台组油气藏受岩性控制。早期勘探证实，葡北地区七克台组底部发育厚度为6~15 m的含油薄砂层。常规反演方法对该薄砂层的预测存在难点，且常规反演方法受地震资料频带限制，反演误差大。为了提高反演精度，提出了基于低频模型优化的相控地质统计学反演方法。结合研究区构造高差大及沉积相带变化快的特点，联合压实趋势校正法和地震属性约束法建立低频模型，得到确定性反演结果，并据此建立相控模型，进而开展相控地质统计学反演，实现对研究区薄砂层的识别。该方法既有效补充了地震信号中缺少的低频信息，又提高了反演结果的纵向分辨率。利用该方法可识别厚度为7 m的薄砂层，反演结果与实钻砂体厚度基本吻合，证实了该方法在葡北地区薄砂层预测中的有效性。

关键词: 吐哈盆地, 葡北地区, 七克台组, 低频模型, 压实趋势, 地震属性, 相控模型, 地质统计学反演

Abstract:

The oil and gas reservoirs in the Qiketai formation of Middle Jurassic in the Pubei area of Taibei sag, Turpan-Hami basin, are controlled by lithology. Early exploration confirmed that there are thin oil-bearing sand layers with the thickness of 6-15 m at the bottom of the Qiketai formation. It is difficult for conventional inversion methods to predict these sand layers and these methods often yield large errors due to the limitations of the frequency band of seismic data. In order to improve inversion accuracy, a facies-controlled geostatistical inversion method based on low-frequency model optimization was proposed. Combined with the characteristics of large structural relief and greatly varying sedimentary facies in the study area, the low-frequency model was established by combining the compaction trend correction method and the seismic attribute constraint method to obtain the deterministic inversion results. On this basis, a facies-controlled model was established for facies-controlled geostatistical inversion, thus enabling the identification of thin sand layers in the study area. This method effectively complements the low-frequency information missed in seismic signals, and improves the longitudinal resolution of the inversion results. By using this method, a thin sand layer with the thickness of 7 m can be identified, and the inversion result is basically consistent with the actual thickness of sand body, which confirms the effectiveness of this method in predicting thin sand layers in Pubei area.

Key words: Turpan-Hami basin, Pubei area, Qiketai formation, low-frequency model, compaction trend, seismic attribute, facies-controlled model, geostatistical inversion

中图分类号:

P631.445

石楠, 刘源, 冷玥, 文一华, 潘海峰, 孙博, 王兵. 基于低频模型优化的相控地质统计学反演方法及应用[J]. 新疆石油地质, 2023, 44(3): 375-382.

SHI Nan, LIU Yuan, LENG Yue, WEN Yihua, PAN Haifeng, SUN Bo, WANG Bing. Facies-Controlled Geostatistical Inversion Method Based on Low-Frequency Model Optimization and Its Application[J]. Xinjiang Petroleum Geology, 2023, 44(3): 375-382.

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