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MONITORING GAS DISTRIBUTION AND ORIGIN IN THE CULZEAN FIELD, UK CENTRAL NORTH SEA, USING DATA FROM A CONTINUOUS ISOTOPE LOGGING TOOL AND ISOTUBE AND TEST SAMPLES
Journal of Petroleum Geology ( IF 1.8 ) Pub Date : 2019-09-16 , DOI: 10.1111/jpg.12745
H. I. Petersen 1 , P. Hillock 1 , S. Milner 2 , M. Pendlebury 2 , D. Scarlett 2
Affiliation  

The high pressure – high temperature Culzean field, UK Central North Sea, contains lean gas condensate in the Triassic Joanne sandstones and the Middle Jurassic Pentland sandstones. A comprehensive gas analysis programme was installed as an integrated part of field development in order to monitor gas composition, distribution and origin in the reservoirs and overburden pre‐ production start‐up. Isotube OUT and isotube IN gas samples were collected. The isotube IN data show that some gas is recycled, including alkenes representing contamination from the degradation of mud additives; but concentrations are minor, and do not seem to affect the isotope values derived from the C2 and C3 isotube OUT gases significantly. 13C‐enriched methane derived from drill‐bit metamorphism is recorded in the isotube IN gas, but likewise in low concentrations. Gas data were also acquired from a Continuous Isotope Logging Tool (CILT) which measures real‐time gas concentrations and isotope values of C1–C3 each foot through the entire drilled section. The CILT thus provides a continuous trend of methane isotope values versus depth, and this trend is useful in identifying changes in gas composition. However, concerns related to CILT include: (i) C1–C3 stable carbon isotope detection limits for isotube OUT gas analyses are considerable lower than for CILT; due to the lower isotube gas concentrations required for measurement of C3 isotopes, isotubes are able to map a shallower vertical thermogenic gas migration front in the overburden. (ii) Discrepancies between isotube OUT and CILT isotope values may be significant and cannot be assigned to analytical uncertainty; by contrast, test gas and isotube OUT isotope values are comparable. Hence, CILT isotope values from specific depths cannot stand in isolation but must be complemented by isotube OUT isotope measurements.

中文翻译:

使用来自连续同位素测井工具,同位素和测试样品的数据,监测英国中北部海域库尔兹油田的天然气分布和起源

英国北海中部的高压高温Culzean油田,在三叠纪乔安河砂岩和中侏罗统彭特兰砂岩中含有贫气凝析油。作为现场开发的组成部分,安装了全面的气体分析程序,以监控储层和上覆岩层的生产前启动过程中的气体组成,分布和来源。收集Isotube OUT和Isotube IN气体样品。isotube IN数据显示,有些气体被回收利用,其中包括烯烃,这些烯烃代表着由泥浆添加剂降解引起的污染。但是浓度很小,并且似乎不会显着影响源自C 2和C 3等管OUT气体的同位素值。13在isotube IN气体中记录了源自钻头变质作用的富含C的甲烷,但浓度也很低。还从连续同位素测井工具(CILT)获取了气体数据,该工具可测量整个钻探区域中每英尺的实时气体浓度和C 1 –C 3的同位素值。因此,CILT提供了甲烷同位素值相对于深度的连续趋势,并且该趋势可用于识别气体成分的变化。但是,与CILT相关的问题包括:(i)等压管OUT气体分析的C 1 -C 3稳定碳同位素检测限远低于CILT;由于测量C 3所需的等压管气体浓度较低同位素,等压管能够绘制出覆盖层中较浅的垂直成热气体运移前沿。(ii)等压管OUT和CILT同位素值之间的差异可能很大,不能归因于分析不确定性;相比之下,测试气体和等压管OUT同位素值是可比的。因此,特定深度的CILT同位素值不能孤立存在,而必须通过isotube OUT同位素测量加以补充。
更新日期:2019-09-16
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