神狐海域W18/19站位天然气水合物上覆层不排水抗剪强度预测

胡高伟; 李彦龙; 吴能友; 陈强; 刘昌岭; 刘振纹

doi:10.16562/j.cnki.0256-1492.2017.05.015

神狐海域W18/19站位天然气水合物上覆层不排水抗剪强度预测

1.
国土资源部天然气水合物重点实验室，中国地质调查局青岛海洋地质研究所，青岛 266071

2.
海洋国家实验室海洋矿产资源评价与探测技术功能实验室，青岛 266071

3.
中国石油集团工程技术研究院，天津 300456

基金项目:
国家自然科学基金(41606078，41474119)；国家重点研发计划项目(2017YFC0307600)；中国地质调查项目(121201005000150016)；青岛海洋科学与技术国家实验室开放基金项目(QNLM2016ORP0207)；泰山学者特聘专家项目

详细信息

作者简介: 胡高伟(1982—)，男，博士, 副研究员，主要从事海洋地球物理、天然气水合物研究，E-mail: hgw-623@163.com

通讯作者: 吴能友(1965—)，男，博士，研究员，主要从事海洋地质、天然气水合物研究，E-mail: wuny@ms.giec.ac.cn

中图分类号: P751

蔡秋蓉编辑

收稿日期: 2017-04-21

修回日期: 2017-06-03

刊出日期: 2017-10-28

UNDRAINED SHEAR STRENGTH ESTIMATION OF THE COVER LAYER OF HYDRATE AT SITE W18/19 OF SHENHU AREA

1.
Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China

2.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

3.
CNPC Engineering Technology Research Institute, Tianjin 300456, China

More Information

Corresponding author: WU Nengyou, wuny@ms.giec.ac.cn

Received Date: 21 April 2017

Revised Date: 03 June 2017

Publish Date: 28 October 2017

摘要

摘要:
天然气水合物上覆层不排水抗剪强度是水合物试采过程中导管喷射设计、地层沉降和井壁稳定性分析的关键参数。孔压静力触探(CPTU)为地层强度参数纵向分布规律研究提供了有效途径。本文基于南海北部神狐海域W18/19站位水合物上覆层的CPTU测试结果和室内实验数据，建立了该区经验锥头系数的确定方法，并基于确定的经验锥头系数求解上覆层不排水抗剪强度。结果表明：W18/19站位水合物上覆层由上至下为强度逐渐增大的钙质黏土，基于总锥尖阻力、有效锥尖阻力、超孔隙压力求解钙质黏土不排水抗剪强度的经验锥头系数分别为13.8、4.2、14.4。水合物上覆层不排水抗剪强度随着深度的增加逐渐增大。基于CPTU建立的不排水抗剪强度计算方法能反映钙质黏土不排水抗剪强度的纵向分布规律。
- 不排水抗剪强度 /
- 孔压静力触探 /
- 水合物上覆层 /
- 神狐海域 /
- 南海北部
Abstract:
Undrained shear strength of the cover layer of hydrate is the most important engineering parameter for conductor jetting design, strata settlement and well stability analysis during gas hydrate production test. The piezocone penetration test (CPTU) could provide effective data to understand the vertical change of undrained shear strength from seabed to hydrate bearing layer. In this paper, we conducted CPTU and corresponding laboratory test at site W18/19 of the Shenhu area, northern South China Sea. Based on the data, the estimation method of cone factor was developed to calculate the undrained shear strength. The result shows that the cover layer of hydrate is mainly consist of calcareous clay and the soil strength becomes harder with the increase in depth. The cone factors calculated from total cone tip resistance, effective cone tip resistance and excess pore pressure is 13.8, 4.2 and 14.4 respectively. Based on the CPTU data, the developed method was used to calculate the vertical change in undrained shear strength, which increases with depth within the W18/19 cover layer of hydrate.
- undrained shear strength /
- piezocone penetration test (CPTU) /
- cover layer of hydrate /
- Shenhu area /
- northern South China Sea

HTML全文

图 1 W18/19站位位置^[29]

Figure 1.

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图 2 W18/19站位CPTU测试结果

Figure 2.

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图 3 基于总锥尖阻力确定W18/19站位上覆土经验锥头系数

Figure 3.

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图 4 基于有效锥尖阻力确定W18/19站位上覆土经验锥头系数

Figure 4.

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图 5 基于超孔隙压力确定W18/19站位上覆土经验锥头系数

Figure 5.

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图 6 基于CPTU参数的W18/19站位上覆土不排水抗剪强度

Figure 6.

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表 1 不同实验手段得到的W18/19站位经验锥头系数

Table 1. Empirical cone factors for site W18/19 based on the different test methods

	超孔隙压力	总锥尖阻力	有效锥尖阻力
袖珍贯入仪	17.3	17.1	5.07
手动十字板	16.3	15.2	4.64
微型电动十字板	12.0	11.6	4.0
三轴不排水不固结剪切实验	11.8	11.1	3.11

下载: 导出CSV

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