基于运移输导体系的天然气水合物成藏类型——以琼东南盆地H区为例

樊奇; 李清平; 吴涛; 李丽霞; 庞维新; 朱振宇

doi:10.11781/sysydz202202262

基于运移输导体系的天然气水合物成藏类型——以琼东南盆地H区为例

doi: 10.11781/sysydz202202262

樊奇^{1, 2,},
李清平^{1, 2},
吴涛³,
李丽霞^{1, 2},
庞维新^{1, 2},
朱振宇¹

1.
中海油研究总院有限责任公司, 北京 100028
2.
天然气水合物国家重点实验室, 北京 100028
3.
中海石油有限公司海南分公司, 海口 570100

基金项目:

国家重点研发计划 2016YFC030400

国家重点研发计划 2019YFC0312301

国家自然科学基金 U19B2005

中国海油重点实验室自主前瞻基础研究课题【2021】32号

详细信息

作者简介:
樊奇(1989—)，男，博士，工程师，从事天然气水合物资源评价和勘探研究工作。E-mail: xjufq@sina.com

中图分类号: TE132.2
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- 被引次数: 0
出版历程
- 收稿日期: 2021-02-21
- 修回日期: 2022-02-28
- 刊出日期: 2022-03-28

Accumulation of natural gas hydrate based on migrating system: a case study of H zone of Qiongdongnan Basin

FAN Qi^{1, 2
,},
LI Qingping^{1, 2},
WU Tao³,
LI Lixia^{1, 2},
PANG Weixin^{1, 2},
ZHU Zhenyu¹

1.
CNOOC Research Institute Company Limited, Beijing 100028, China
2.
State Key Laboratory of Natural Gas Hydrates, Beijing 100028, China
3.
CNOOC Hainan Company, Haikou, Hainan 570100, China

摘要

摘要: 琼东南盆地是南海天然气水合物富集区和重点勘查地区，但天然气水合物地质研究薄弱。通过三维地震资料解释、地球化学资料分析和大量调研统计，对琼东南盆地H区开展了以水合物成藏系统为主线、运移输导体系为重点的研究。累计48组地球化学数据分析表明，H区水合物分解气的甲烷碳同位素特征(δC₁=-48.2‰)和较高的乙烷、丙烷含量(C₂₊含量为21%)，指示该区气源具有“热成因气为主、含混合成因气”的特征。地震解释发现，H区第四纪构造活动程度弱，NNE走向发育的气烟囱构造群、多边形断裂—粉砂复合体、海底滑塌扇构成了主要运移输导体系和优质储层。基于H区天然气水合物的气源特征和运移输导体系，预测并分析了“富含热成因气的气烟囱型水合物、富含热成因气的多边形断裂—粉砂复合型水合物、富含热成因气和混合成因气的海底滑塌扇水合物”成藏类型。
- 气烟囱 /
- 多边形断裂 /
- 热成因气 /
- 天然气水合物 /
- 成藏 /
- 琼东南盆地
Abstract: Gas hydrate is greatly developed in the Qiongdongnan Basin which is one of the key exploration targets in the South China Sea, but the geological study of gas hydrate is insufficient. With 3D seismic data interpretation, geochemical data analysis and a large number of investigations, a related research work of H zone in the Qiongdongnan Basin was carried out in this paper, with accumulation system as the main line and focused on migration and transportation system. According to the analysis of 48 sets of geochemical data, the hydrate decomposition gas in H zone has a methane carbon isotope value (δ¹³C₁) of -48.2‰ and a higher content of ethane and propane (C₂₊=21%), indicating that the gas is mainly thermogenic, and some are mixed gas. Seismic interpretation showed that the Quaternary tectonic activity in H zone was weak, and the NNE-trending gas chimney structure group, polygonal fault-silt complex and submarine slump body constituted the main migrating system and high-quality reservoir in the study area. Based on the gas source characteristics and migrating system of natural gas hydrate in H zone, three accumulation types were proposed, including the gas chimney type hydrate rich in thermogenic gas, the polygonal fracture-silt composite hydrate rich in thermogenic gas, and the submarine slump hydrate rich in thermogenic gas and mixed genetic gas.
- gas chimney /
- polygonal fault /
- thermogenic gas /
- gas hydrate /
- hydrate accumulation /
- Qiongdongnan Basin

HTML全文

图 1 中国海油在琼东南海域钻获的天然气水合物保温保压岩心

Figure 1. A temperature and pressure maintained core sample for natural gas hydrate drilled by CNOOC in Qiongdongnan Sea area

下载: 全尺寸图片幻灯片

图 2 琼东南盆地区域构造位置及地层柱状图

Figure 2. Regional tectonic location and stratigraphic histogram of Qiongdongnan Basin

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图 3 琼东南盆地H区气烟囱构造地震反射特征

Figure 3. Seismic reflection characteristics of gas chimney structures in H zone of Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 4 琼东南盆地H区多边形断裂地震反射特征

Figure 4. Seismic reflection characteristics of polygonal fractures in H zone of Qiongdongnan Basin

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图 5 琼东南盆地H区海底滑塌扇地震反射特征

Figure 5. Seismic reflection characteristics of submarine slump body in H zone of Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 6 琼东南盆地地温梯度和海底热流值平面分布

Figure 6. Isogram of geothermal gradient and seafloor heat flow of Qiongdongnan Basin

下载: 全尺寸图片幻灯片

图 7 琼东南盆地H区天然气水合物成藏模式

Figure 7. Reservoir model of gas hydrate in H zone, Qiongdongnan Basin

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表 1 琼东南盆地和神狐海域天然气水合物中甲烷碳同位素及气体湿度值

Table 1. Methane carbon isotope and gas humidity in natural gas hydrates in Qiongdongnan Basin and Shenhu Sea areas

琼东南H区^{[1, 10-11]}			琼东南H区^{[1, 10-11]}			神狐海域^{[2, 12]}
样品号	δ¹³C₁_(VPDB)/‰	C₁/(C₂+C₃)	样品号	δ¹³C_1(VPDB)/‰	C₁/(C₂+C₃)	样品号	δ¹³C_1(VPDB)/‰	C₁/(C₂+C₃)
QDN-H1(本次)	-58.90	7.53	QDN-W9B-1		12	SH-SC-W01B-1	-50.09	980
QDN-H2(本次)	-48.50	6.38	QDN-W9B-2		7	SH-SC-W01B-2	-47.39	361
QDN-ODP-1	-33.37	27.18	QDN-W9B-3		28	SH-SC-W01B-3	-47.28	84
QDN-ODP-2	-31.96	24.88	QDN-W9B-4		19	SH-SC-W01C-1	-46.46	1 716
QDN-ODP-3	-31.59	32.03	QDN-W9B-5		23	SH-SC-W01C-2	-46.56	2 333
QDN-ODP-4	-29.92	25.69	QDN-W9C-6		25	SH-SC-W01C-3	-47.12	131
QDN-ODP-5	-30.17	29.61	QDN-W9C-7		27	SH-SC-W01C-4	-47.66	127
QDN-ODP-6	-31.14	28.86	QDN-W9C-8		44	SH-SC-W01C-5	-47.79	102
QDN-ODP-7	-31.28	26.51	QDN-W8C-1		69	SH-GMGS2-08F	-71.20	1 999
QDN-ODP-8	-31.87	27.57	QDN-W8C-2		54	SH-SH2	-63.20	195
QDN-ODP-9	-33.35	30.69	QDN-W8C-3		68	SH-SH2B-12R	-56.70	911.7
QDN-ODP-10	-32.22	28.15	QDN-W8C-4		5	SH-SH3B-7P	-62.20	1 373.5
QDN-ODP-11	-32.51	29.76	QDN-W8C-5		40	SH-SH3B-13P	-60.90	1 094
QDN-ODP-12	-33.65	30.87	QDN-W8C-6		6	SH-SH5C-11R	-54.10	2 447
QDN-SS1721-1	-36.80	0.94(气井)	QDN-W8C-7		43
QDN-SS2211-3	-39.20	0.93(气井)	QDN-W8C-8		68
QDN-BD1922-1	-38.80	0.93(气井)
QDN-YC1311-1	-34.40	0.95(气井)

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