|本期目录/Table of Contents|

[1]沈伟锋 于仲坤 刁 慧 张 涛.西湖凹陷热流演化史模拟及成藏意义[J].中国海上油气,2020,32(01):42-53.[doi:10.11935/j.issn.1673-1506.2020.01.005]
 SHEN Weifeng YU Zhongkun DIAO Hui ZHANG Tao.Simulation of heat flow evolution history in Xihu sag and its significance for hydrocarbon accumulation[J].China Offshore Oil and Gas,2020,32(01):42-53.[doi:10.11935/j.issn.1673-1506.2020.01.005]
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西湖凹陷热流演化史模拟及成藏意义()

《中国海上油气》[ISSN:1673-1506/CN:11-5339/TE]

卷:
第32卷
期数:
2020年01期
页码:
42-53
栏目:
油气勘探
出版日期:
2020-01-15

文章信息/Info

Title:
Simulation of heat flow evolution history in Xihu sag and its significance for hydrocarbon accumulation
文章编号:
1673-1506(2020)01-0042-12
作者:
沈伟锋 于仲坤 刁 慧 张 涛
(中海石油(中国)有限公司上海分公司 上海 200335)
Author(s):
SHEN Weifeng YU Zhongkun DIAO Hui ZHANG Tao
(CNOOC China Limited, Shanghai Branch, Shanghai 200335, China)
关键词:
西湖凹陷 热流演化史 岩石圈模型 煤系烃源岩 热成熟度 成藏意义
Keywords:
Xihu sag history of thermal flow evolution lithosphere model coal-bearing source rocks thermal maturity significance of hydrocarbon accumulation
分类号:
TE121.1
DOI:
10.11935/j.issn.1673-1506.2020.01.005
文献标志码:
A
摘要:
运用盆地模拟技术中的岩石圈模型,基于大面积3D地震和90多口探井资料,建立了西湖凹陷精细的构造、地层、岩性模型,完成了岩石圈和沉积盆地2个尺度的热演化史模拟,得到了西湖凹陷不同地质时期的热流值; 在此基础上,计算了不同时期的温度和烃源岩成熟度Ro,并通过现今实测的23口井校正后井底温度、50口井DST测试温度与42口井Ro测定值进行了校验及修正。结果表明,西湖凹陷现今基底热流分布在40~60 mW/m2,裂陷末期(32 Ma)热流分布在60~70 mW/m2,且中央构造带高、两侧斜坡带低,符合裂谷盆地的特点; 但是,该地区现今和裂陷末期热流值远低于现今仍在张裂的弧后盆地即冲绳海槽的平均热流值458 mW/m2,说明二者的盆地成因机制可能不同,根据现今热流分布特点推测该地区现今岩石圈可能并没有冷却到位,或者因后期反转、岩石圈底界抬升而导致上覆岩层遭受剥蚀以达到均衡。西湖凹陷平湖组煤系烃源岩现今热成熟度与油气性质存在较好的相关性,凹陷中北部为高—过成熟区,气藏以干气为主; 而凹陷南部和斜坡带则为低—高成熟区,以凝析气和油藏为主,因此,凹陷南部和斜坡带是寻找规模性凝析气和油藏的有利区,凹陷北部是寻找大中型气田的有利区。
Abstract:
By using the lithosphere model in basin simulation technology, based on the data of large-area 3D seismic and over 90 exploration wells, a fine structure, stratum, and lithology model of the Xihu sag was established to achieve the thermal evolution historical simulations in two scales of lithosphere and sedimentary basin, hence obtaining the heat flux values of Xihu sag in different geological periods. On this basis, the temperature and source rock maturity Ro in different periods were calculated, and the Ro measured values in 42 wells were calibrated and corrected with the currently measured bottomhole temperature in 23 wells and DST test temperature in 50 wells. The results show that the current heat flow in the basement of Xihu sag is 40~60 mW/m2, the heat flow at the end of the rift(32 Ma)was 60~70 mW/m2, and it is high in the central structure and low in the slopes on both sides, which tallies with the characteristics of rift basin. However, the heat flux values at present and at the end of the rifting period in this area are far lower than the average heat flux value of 458 mW/m2 in the post-arc basin still keeping expanding(i.e., the Okinawa Trough). It is speculated that the current lithosphere in this area may not have been cooled in place, or the overlying strata have suffered erosion to achieve equilibrium due to late inversion or the uplift of lithosphere bottom boundary. The current thermal maturity of the Pinghu coal-bearing source rocks in Xihu sag shows a good correlation with oil-gas properties. The central-northern sag is the high-over mature area, and the gas reservoirs are mainly dry gas. The southern and the slopes are low-high maturity area dominated by condensate gas and oil reservoirs. Therefore, the southern sag and the slopes are favorable areas for finding large-scale condensate gas/oil reservoirs, and the northern sag is a favorable area for finding large-medium scale gas fields.

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备注/Memo

备注/Memo:
*“十三五”国家科技重大专项课题“东海盆地天然气资源潜力评价(编号:2016ZX05027-001)”部分研究成果。 第一作者简介:沈伟锋, 男,高级工程师,主要从事石油地质综合研究和风险勘探评价工作。地址:上海市长宁区通协路388号中海油大厦(邮编:200335)。E-mail: shenwf7@cnooc.com.cn。收稿日期:2018-11-20 改回日期:2019-08-26
更新日期/Last Update: 2020-01-15