莺歌海盆地乐东斜坡区乐东A构造储层超压形成机制及其对天然气成藏的启示

李超, 罗晓容, 范彩伟, 张立宽, 刘爱群, 李虎, 李俊. 2021. 莺歌海盆地乐东斜坡区乐东A构造储层超压形成机制及其对天然气成藏的启示. 地质科学, 56(4): 1034-1051. doi: 10.12017/dzkx.2021.054
引用本文: 李超, 罗晓容, 范彩伟, 张立宽, 刘爱群, 李虎, 李俊. 2021. 莺歌海盆地乐东斜坡区乐东A构造储层超压形成机制及其对天然气成藏的启示. 地质科学, 56(4): 1034-1051. doi: 10.12017/dzkx.2021.054
Li Chao, Luo Xiaorong, Fan Caiwei, Zhang Likuan, Liu Aiqun, Li Hu, Li Jun. 2021. Generation mechanism of overpressure and its implication for natural gas accumulation in Miocene reservoir in Ledong A structrure, Ledong slope, Yinggehai Basin. Chinese Journal of Geology, 56(4): 1034-1051. doi: 10.12017/dzkx.2021.054
Citation: Li Chao, Luo Xiaorong, Fan Caiwei, Zhang Likuan, Liu Aiqun, Li Hu, Li Jun. 2021. Generation mechanism of overpressure and its implication for natural gas accumulation in Miocene reservoir in Ledong A structrure, Ledong slope, Yinggehai Basin. Chinese Journal of Geology, 56(4): 1034-1051. doi: 10.12017/dzkx.2021.054

莺歌海盆地乐东斜坡区乐东A构造储层超压形成机制及其对天然气成藏的启示

  • 基金项目:

    中国科学院地质与地球物理研究所重点部署项目(编号:IGGCAS-201903)、中国科学院A类战略性先导科技专项(编号:XDA14010202)和国家自然科学基金项目(编号:U20B2014)资助。

详细信息
    作者简介:

    李超,男,1989年生,博士(博士后),石油地质学专业。E-mail:lichaocpu@126.com

  • 中图分类号: P618.130

Generation mechanism of overpressure and its implication for natural gas accumulation in Miocene reservoir in Ledong A structrure, Ledong slope, Yinggehai Basin

  • 莺歌海盆地乐东斜坡区乐东A构造深层超压天然气资源丰富,查明超压形成机制对于认识乐东斜坡区天然气运移成藏过程和地层压力准确预测至关重要。根据超压测井响应、数值模拟及天然气成藏条件解剖讨论了乐东A构造储层超压成因机制,分析了储层强超压形成与天然气成藏的关系。结果表明:乐东A构造中新统储层普遍发育超压,压力系数最大可达2.27,接近地层破裂压力梯度,纵向上压力系数发生突变。富泥地层快速埋藏导致的机械压实不均衡作用可使压力系数达到1.5~1.6左右。强超压(压力系数>1.6)表现出明显的卸载响应特征,表明储层压力远高于原位泥岩压力。储层中卸载型超压主要是由三亚组超压沿断层垂向传递作用引起的。储层强超压的形成与天然气运移成藏过程密切相关,深层成熟—高成熟的三亚组烃源岩提供了强超压传递的流体来源,烃源岩与储层之间发育的隐伏断层/微裂隙系统为天然气垂向运移及超压垂向传递提供了有利通道,天然气晚期充注有利于透镜状砂体中传递超压的保存。研究认识将为钻前压力预测和安全钻井设计提供有效参考,并为莺歌海盆地非底辟区高温高压天然气成藏过程提供新的见解。
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收稿日期:  2021-06-30
修回日期:  2021-08-13

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