| 焦石坝地区页岩各向异性及其影响的分析研究 |
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| 引用本文： | 李文成,扶喆一.焦石坝地区页岩各向异性及其影响的分析研究[J].物探与化探,2019(2):266-272. |
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| 作者姓名： | 李文成 扶喆一 |
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| 作者单位： | 中石化勘探分公司 |
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| 基金项目： | 国家科技重大专项"页岩气区带目标评价与勘探技术"(2017ZX05036);中石化科技部基础研究项目"川渝地区海相优质页岩气层形成主控因素及预测技术"(P15074) |
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| 摘 要： | 黑色富含有机质页岩由于沉积方式的特殊性,一般具有较强的各向异性。但现有大部分研究是基于各向同性理论开展页岩储层预测工作,这与页岩的实际地质特点不符。文中联合利用实验室岩石力学测试数据以及各向异性参数经验公式计算焦石坝地区页岩的各向异性参数,并进一步探讨了各向异性对页岩岩石速度、储层AVO响应特征以及岩石力学参数计算的影响。结果表明,各向异性对页岩速度、脆性指数预测结果影响较大,在地层倾角较大时进行速度分析及页岩可压性预测时应考虑各向异性参数的影响;同时,AVO正演结果表明地震反射入射角小于40°时,各向异性算法与各向同性算法计算的页岩AVO响应差异较小,利用各向同性叠前反演方法进行页岩储层预测具有可行性。
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| 关 键 词： | 页岩 各向异性 岩石速度 AVO响应 脆性指数 |
The anisotropic characteristics and impact of organic-rich shale: A Jiaoshiba demonstration |
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| Institution: | (Exploration Branch Company of SINOPEC,Chengdu 610041,China) |
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| Abstract: | Because of the particular depositional mode,black organic matter-rich shales are generally characterized by strong velocity anisotropy;however,most researches on shale are on the basis of isotropic theory,which obviously ignores the geological characteristics of shale.In this paper,anisotropic parameters of shale are calculated by combining rock mechanical measurements in the laboratory with the empirical methods from the literature.On the one hand,the parameters are used to investigate their effects on the calculation of velocity versus bedding direction and rock mechanical parameters,and the result shows that the anisotropic characteristics of shale cannot be neglected when the dip angle of the strata is large.On the other hand,little difference between AVO responses of anisotropic and isotropic methods when the incidence angle is less than 40° indicates the feasibility of isotropic pre-stack seismic inversion in predicting shale " sweet spot". |
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| Keywords: | shale anisotropy rock velocity AVO response brittleness index |
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