Mapping hydrocarbon charge-points in the Wessex Basin using seismic, geochemistry and mineral magnetics
Mapping hydrocarbon charge-points in the Wessex Basin using seismic, geochemistry and mineral magnetics
复制标题
利用地震、地球化学和矿物磁学绘制威塞克斯盆地碳氢化合物充注点图
DOI：
10.1016/j.marpetgeo.2019.08.042
复制
发表时间：
2020
影响因子：
4.2
通讯作者：
P. Southern
中科院分区：
文献类型：
--
作者：
R. Abubakar;A. R. Muxworthy;A. Fraser;M. A. Sephton;J. S. Watson;D. Heslop;G. A. Paterson;P. Southern
这项研究报告了一种多学科方法来确定英格兰南部韦塞克斯盆地的碳氢化合物充注点和运移。用气相色谱-质谱仪(GC-MS)对储集层岩心物质(布里德波特砂岩和下部橄榄岩层)进行的地球化学分析表明，韦塞克斯盆地的石油来自单一来源，环境敏感生物标志物的微小变化可能是由于数百万年石油形成过程中成熟度或沉积条件的微小差异所致。利用地震资料，盆地模拟揭示了两条潜在的油气运移路径，从Purbeck断层的上盘进入Wytch农场的Sherwood砂岩储层。其中一条潜在路径由名为克里奇的岩心和另一条布希农场代表。为了区分这两种可能的途径，利用矿物磁性技术对岩心进行了研究。使用低温(<；50 K)磁性测量对磁性特征进行了表征；这是因为大部分磁性特征是由纳米颗粒 <； 30 nm主导的，它们在室温下被热激活，并且磁性是“透明的”。含有大量碳氢化合物的油井以纳米磁铁矿(<；30 nm)为主。这种颗粒足够小，可以与石油一起通过大约100 nm的孔隙空间迁移。位于大型油气聚集边缘的油井增强了以磁黄铁矿为主的磁信号。在两条可能的运移途径中，矿物磁性结果表明，石油是通过克里奇而不是布希农场运移的。
This study reports a multidisciplinary approach to determining hydrocarbon charge-points and migration in the Wessex Basin, southern England. Geochemical analysis of reservoir core material (Bridport Sandstone and Inferior Oolite) using gas chromatography-mass spectrometry (GC-MS), suggests that the oil in the Wessex Basin is from a single source, and that small variations in environmentally sensitive biomarkers are likely due to small differences in maturity or depositional conditions during the formation of the oil over millions of years. Using seismic data, basin modelling revealed two potential hydrocarbon migration pathways from the hanging wall of the Purbeck fault into the Sherwood Sandstone reservoir at Wytch Farm. One of these potential pathways is represented by cores termed Creech and the other Bushey Farm. To try to distinguish between the two potential pathways, cores were studied using mineral magnetic techniques. The magnetic signature was characterised using low-temperature (<50 K) magnetic measurements; this is because much of the magnetic signature was dominated by nanoparticles < 30 nm, which are thermally activated at room temperature and magnetically “transparent”. Wells that contained considerable amounts of hydrocarbons were dominated by nanometric magnetite (<30 nm). Such particles are small enough to migrate with the oil, through pore spaces, which are of the order ~100 nm. Wells located at the fringes of large hydrocarbon accumulation had enhanced pyrrhotite-dominated magnetic signals. Of the two potential migration pathways, the mineral magnetic results suggest that the oil migrated through Creech rather than through Bushey Farm.
登录
查看更多内容
影响因子：
2.8
作者：
Muxworthy, AR;McClelland, E
通讯作者：
McClelland, E
影响因子：
3.5
作者：
J. Moldowan;W. K. Seifert;E. J. Gallegos
通讯作者：
J. Moldowan;W. K. Seifert;E. J. Gallegos
DOI：
10.1144/gsl.sp.1998.133.01.08
发表时间：
1998
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
A. Law
通讯作者：
A. Law
DOI：
10.1144/sp371.6
发表时间：
2012-06
期刊：
--
影响因子：
--
作者：
S. Emmerton;A. Muxworthy;M. Sephton
通讯作者：
S. Emmerton;A. Muxworthy;M. Sephton
影响因子：
2
作者：
P. A. Bjørkum;O. Walderhaug
通讯作者：
P. A. Bjørkum;O. Walderhaug