The Jiangda–Deqen–Weixi continental margin arc(DWCA) developed along the base of the Changdu–Simao Block and was formed as a result of the subduction of the Jinsha River Ocean Slab and the subsequent collision. The...The Jiangda–Deqen–Weixi continental margin arc(DWCA) developed along the base of the Changdu–Simao Block and was formed as a result of the subduction of the Jinsha River Ocean Slab and the subsequent collision. The Ludian batholith is located in the southern part of the DWCA and is the largest batholith in northwest Yunnan. Granite samples from the Ludian batholith yield an early Middle Permian age of 271.0 ± 2.8 Ma. The geochemical data of the early Middle Permian granitoids show high Si2 O, low P2 O5 and MgO contents that belong to calc-alkaline series and peraluminous I-type rocks. Their εHf(t) values range from-5.01 to +0.58, indicating that they were formed by hybrid magmas related to the subduction of the Jinsha River Tethys Ocean. The monzonite and monzogranite samples yield Late Permian ages of 250.6 ± 1.8 Ma and 252.1 ± 1.3 Ma, respectively. The Late Permian granitoids are high-K calc alkaline and shoshonite series metaluminous I-type rocks. Their εHf(t) values range from-4.12 to-1.68 and from-7.88 to-6.64, respectively. The mixing of crustal and mantle melts formed the parental magma of the Late Permian granitoids. This study, combined with previous work, demonstrates the process from subduction to collision of the Jinsha River Paleo-Tethys Ocean.展开更多
页岩油勘探开发中,含油饱和度是评价页岩油资源量的关键参数。目前针对页岩油饱和度的计算方法主要集中在实验评价上,利用录井资料进行饱和度评价的研究较少。该文以核磁共振(Nuclear Magnetic Resonance,NMR)实验及密闭热释烃录井为基...页岩油勘探开发中,含油饱和度是评价页岩油资源量的关键参数。目前针对页岩油饱和度的计算方法主要集中在实验评价上,利用录井资料进行饱和度评价的研究较少。该文以核磁共振(Nuclear Magnetic Resonance,NMR)实验及密闭热释烃录井为基础,提出了一种基于地化录井数据的页岩油饱和度计算方法。通过多状态NMR实验,构建了涠西南凹陷NMR流体组分图版,并基于流体体积法计算得到NMR饱和度。同时,利用密闭热释烃实验获得可动油含量及总含油量。综合这两种实验结果,并结合岩石密度、总孔隙度等参数,进一步构建了基于NMR技术的改进密闭热释录井饱和度模型。在模型实际应用中,考虑到现场地化录井过程中烃含量可能存在损失,通过密闭热释录井数据构建损失烃校正模型。通过上述方法,形成了一种以地化录井数据为基础计算页岩含油饱和度的评价方法。实例处理结果显示,该方法计算得到的可动油饱和度绝对误差为3.82%,含油饱和度绝对误差为8.81%。计算结果的范围分别为11%~46%和30%~91%。这一方法为利用录井资料评价页岩储层饱和度提供了新的思路。展开更多
基金funded by a grant from the National Key R&D Program of China(Grant No.2018YFC0604106 and 2016YFC0600305)the Program of the China Geological Survey(Grant No.DD20190053)。
文摘The Jiangda–Deqen–Weixi continental margin arc(DWCA) developed along the base of the Changdu–Simao Block and was formed as a result of the subduction of the Jinsha River Ocean Slab and the subsequent collision. The Ludian batholith is located in the southern part of the DWCA and is the largest batholith in northwest Yunnan. Granite samples from the Ludian batholith yield an early Middle Permian age of 271.0 ± 2.8 Ma. The geochemical data of the early Middle Permian granitoids show high Si2 O, low P2 O5 and MgO contents that belong to calc-alkaline series and peraluminous I-type rocks. Their εHf(t) values range from-5.01 to +0.58, indicating that they were formed by hybrid magmas related to the subduction of the Jinsha River Tethys Ocean. The monzonite and monzogranite samples yield Late Permian ages of 250.6 ± 1.8 Ma and 252.1 ± 1.3 Ma, respectively. The Late Permian granitoids are high-K calc alkaline and shoshonite series metaluminous I-type rocks. Their εHf(t) values range from-4.12 to-1.68 and from-7.88 to-6.64, respectively. The mixing of crustal and mantle melts formed the parental magma of the Late Permian granitoids. This study, combined with previous work, demonstrates the process from subduction to collision of the Jinsha River Paleo-Tethys Ocean.
文摘页岩油勘探开发中,含油饱和度是评价页岩油资源量的关键参数。目前针对页岩油饱和度的计算方法主要集中在实验评价上,利用录井资料进行饱和度评价的研究较少。该文以核磁共振(Nuclear Magnetic Resonance,NMR)实验及密闭热释烃录井为基础,提出了一种基于地化录井数据的页岩油饱和度计算方法。通过多状态NMR实验,构建了涠西南凹陷NMR流体组分图版,并基于流体体积法计算得到NMR饱和度。同时,利用密闭热释烃实验获得可动油含量及总含油量。综合这两种实验结果,并结合岩石密度、总孔隙度等参数,进一步构建了基于NMR技术的改进密闭热释录井饱和度模型。在模型实际应用中,考虑到现场地化录井过程中烃含量可能存在损失,通过密闭热释录井数据构建损失烃校正模型。通过上述方法,形成了一种以地化录井数据为基础计算页岩含油饱和度的评价方法。实例处理结果显示,该方法计算得到的可动油饱和度绝对误差为3.82%,含油饱和度绝对误差为8.81%。计算结果的范围分别为11%~46%和30%~91%。这一方法为利用录井资料评价页岩储层饱和度提供了新的思路。
