利用HRGC数据表征烃源岩岩心样品中的石油

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
A. Kornacki
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引用次数: 0

摘要

从Upper Wolfcamp(UW)和Eagle Ford源岩(SR)床中选择的中心切割水平岩心塞中获得的溶剂提取物含有未改变的挥发性(即汽油范围)HC化合物,因为它们是在封闭的小瓶中提取的。因此,使用C7来源参数、C7成熟度参数和三烷/植烷比率来比较这些石油样品与同一SR储层中附近油井生产的石油样品的来源和热成熟度。之前根据地质标准在UW SR储层中确定的五个不同的产油层,每个产油层都包含在不同热成熟度水平下产生的略有不同的石油种类。厚厚的上覆碳酸盐岩储层包含由下伏SR产层中的干酪根产生的石油。相同的来源和成熟度参数表明,Eagle Ford SR层中的易油干酪根在不同的沉积环境中形成,这些岩芯塞选自德克萨斯州南部圣马科斯拱门上相距7.5英里(12公里)的油井。仅使用岩心塞提取物很难分配混合油样,因为溶剂提取可生产的油加上一种组分,该组分由于吸附在干酪根和/或粘土矿物中而不容易从SR储层中流出。然而,由于仅使用饱和HC化合物来确定C7来源和成熟度参数,因此它们为SR油藏和混合油样品中游离油的性质提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterizing petroleum in source-rock core samples using HRGC data
Solvent extracts obtained from center-cut horizontal core plugs selected in Upper Wolfcamp (UW) and Eagle Ford source-rock (SR) beds contain unaltered volatile (i.e., gasoline-range) HC compounds because they were extracted in a closed vial. Therefore, a C7 source parameter, a C7 maturity parameter, and pristane/phytane ratios were used to compare the source and thermal maturity of these petroleum samples and oil samples produced from nearby wells landed in the same SR reservoirs. Five distinct pay zones previously identified in the UW SR reservoir using geological criteria each contain slightly different kinds of petroleum generated at different levels of thermal maturity. A thick overlying carbonate reservoir contains the kind of petroleum generated by the kerogen present in one underlying SR pay zone. The same source and maturity parameters demonstrate that the oil-prone kerogen present in Eagle Ford SR beds in core plugs selected from wells located ˜7.5 mi (12 km) apart on the San Marcos Arch in South Texas formed in different depositional environments. It is difficult to allocate commingled oil samples using only core-plug extracts because solvents extract the producible oil plus a component that does not readily flow from SR reservoirs because it is sorbed in kerogen and/or on clay minerals. However, because only saturate HC compounds were used to determine C7 source and maturity parameters, they provide valuable insights about the nature of the free oil present in SR reservoirs and in commingled oil samples.
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来源期刊
CiteScore
2.50
自引率
8.30%
发文量
126
期刊介绍: ***Jointly published by the American Association of Petroleum Geologists (AAPG) and the Society of Exploration Geophysicists (SEG)*** Interpretation is a new, peer-reviewed journal for advancing the practice of subsurface interpretation.
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