| 高渗水合物储层的孔隙可压缩性反演 |
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| 引用本文： | 邓炜,梁金强,匡增桂,何玉林,梁劲,钟桐.高渗水合物储层的孔隙可压缩性反演[J].地球物理学报,2021,64(1):298-313. |
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| 作者姓名： | 邓炜 梁金强 匡增桂 何玉林 梁劲 钟桐 |
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| 作者单位： | 中国地质调查局天然气水合物工程技术中心,广州510700;中国地质调查局广州海洋地质调查局,广州510700;中国地质调查局天然气水合物工程技术中心,广州510700;南方海洋科学与工程广东省实验室(广州),广州511458;中国地质调查局广州海洋地质调查局,广州510700;中国地质调查局广州海洋地质调查局,广州510700;中国地质调查局广州海洋地质调查局,广州510700;中国地质调查局广州海洋地质调查局,广州510700 |
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| 基金项目： | 中国地质调查局项目（DD20190217），广州市科技计划项目资助（201909010002），南方海洋科学与工程广东省实验室（广州）人才团队引进重大专项（GML2019ZD0102）联合资助. |
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| 摘 要： | 孔隙可压缩性与水合物储层物性相关.由于海域天然气水合物埋藏较浅,沉积物尚未成岩,海底水合物储层处于固结和完全未固结之间的状态,通过岩石物理推导证明,这两种状态下体积模量之差仅与孔隙可压缩性相关,因此孔隙可压缩性反应了岩石颗粒从悬浮态到正常压实的成岩进程,它可能与储层束缚水饱和度及渗透率密切相关.本文利用多口典型井数据分析了孔隙可压缩性与渗透率的关系,结果表明在海底浅层沉积物中渗透率越高,孔隙可压缩性越小,孔隙可压缩性对高渗储层的判识能力明显强于其他参数.然后,本文建立了两种状态下叠前地震反射特征的差异与岩石孔隙可压缩性的联系,提出双状态叠前反演方法,综合利用叠前地震数据以及测井资料反演得到了岩石孔隙可压缩性.实际应用效果表明,孔隙可压缩性较好的预测了高渗透率地层,气烟囱、粗粒的高含砂层等含气流体疏导通道渗透率较高,同时为水合物形成提供有利条件.
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| 关 键 词： | 水合物 渗透率 孔隙可压缩性 双状态叠前反演 储层预测 |
| 收稿时间： | 2019-12-04 |
Pore compressibility seismic inversion for high-permeability hydrate reservoir |
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| DENG Wei,LIANG JinQiang,KUANG ZengGui,HE YuLin,LIANG Jin,ZHONG Tong.Pore compressibility seismic inversion for high-permeability hydrate reservoir[J].Chinese Journal of Geophysics,2021,64(1):298-313. |
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| Authors: | DENG Wei LIANG JinQiang KUANG ZengGui HE YuLin LIANG Jin ZHONG Tong |
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| Institution: | 1. Natural Gas Hydrate Engineering Technology Center, China Geological Survey, Guangzhou 510700, China;2. Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510700, China;3. Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 511458, China |
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| Abstract: | Pore compressibility is related to physical properties of hydrate reservoirs. The submarine sediment can generally be considered as a saturated fluid system composed of pore fluid, dry rock matrix and cement. Because the hydrates are buried shallow, the hydrate-bearing sediments have not been consolidated, and the elastic characteristics of the hydrate reservoir lie between consolidated state and completely unconsolidated state, whose difference exists in the pore compressibility. It was proved by petrophysical derivation that the difference in bulk modulus between these two states is only related to the pore compressibility. Pore compressibility reflects the progress of rock particles from suspended state to normal compaction. It is closely related reservoir permeability. Log data analysis has confirmed this view. Then, the paper studied the prestack seismic reflection under the two states, and proposed a dual-state prestack inversion method. The pore compressibility was obtained by comprehensively using pre-stack seismic data inversion constrained by log data. The real data application shows that the pore compressibility is better predictive of high permeability formation and hydrate and free gas distribution. Gas chimney, coarse grained sand and other gas-containing fluid drainage channels owns higher permeability, which provides favorable conditions for hydrate formation. |
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| Keywords: | Hydrate Permeability Pore compressibility Dual-state prestack inversion Reservoir prediction |
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