Application of Poisson impedance for identification of sweet spot in the Paleogene low-permeability sandstone reservoir in Lufengnan Sag
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摘要:
陆丰南地区古近系储层纵横向非均质性较强，沉积成岩演化复杂，寻找具有经济产能的“甜点”储层是古近系高效勘探的关键。基于岩石物理分析及坐标旋转明确了泊松阻抗为识别“甜点”储层最敏感的弹性参数。在协克里金低频建模基础上，开展叠前弹性参数反演直接获得了相关弹性参数（纵波速度vp、横波速度vs和密度ρ），进而构建了泊松阻抗等弹性参数数据体并以此为基础开展砂岩储层及“甜点”储层的定量解释及预测。反演结果表明，目标层文昌组“甜点”储层分布明显受沉积相带的控制，岩性主要为水下分流河道沉积微相砂岩，沉积相特征与钻井资料吻合。此技术方法的应用可实现古近系“甜点”储层由定性到定量的转变，提高了古近系深层勘探成功率,为古近系“增储上产”提供了有力的支撑。
Abstract:The lateral heterogeneity of Paleogene reservoirs in the Lufengnan Sag of the Pearl River Mouth Basin is obvious, and the sedimentary and diagenetic evolution is complex. Finding “sweet spot” reservoir with economic productivity is the key to efficient exploration of the Paleogene reservoir. Based on petrophysical analysis and coordinate rotation, it is clear that Poisson impedance is the most sensitive elastic parameter to identify “sweet spot” reservoir. By the Co-Kriging low-frequency modeling, the prestack elastic parameter inversion was carried out, from which and the relevant elastic parameters were obtained directly, and then the elastic parameter dataset including Poisson impedance was constructed, based on which the quantitative interpretation and prediction of sandstone reservoir and "sweet spot" reservoir were performed. The inversion results show that the distribution of the “sweet spot” reservoir of Wenchang Formation is obviously controlled by the sedimentary facies. The lithology is mainly microfacies sandstone indicative of underwater distributary channel, and the characteristics of sedimentary facies are consistent with the drilling data. The application of this technology and method can realize the transformation of Paleogene “sweet spot” reservoir exploration from qualitative to quantitative determination, improve the success rate of deep exploration in the Paleogene, and provide a strong support for increasing reserves and production in the Paleogene.
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Key words:
- Paleogene /
- sweet spot /
- Co-Kriging modeling /
- Poisson impedance /
- prestack elastic parameter inversion /
- Lufengnan Sag
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表 1 陆丰凹陷南部古近系文昌组储层分类评价
Table 1. Reservoir classification and evaluation of the Paleogene Wenchang Formation in the southern Lufeng Sag
储层分类 Ⅰ Ⅱ Ⅲ 物性特征 φ/% ＞11 8～11 <8 K/（10−3 µm2） >10 4～10 0.1～4 孔隙
特征平均孔径/μm ＞7 1～2 0.4～1 孔隙类型 原生粒间孔-溶孔 溶孔 
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