西加拿大盆地二白斑组地球化学特征与页岩油有利勘探区筛选
发布时间：2019-01-18 10:50
【摘要】：通过对9口井岩心样品岩石热解、气相色谱质谱、有机地球化学和X射线衍射分析,探讨了西加拿大盆地二白斑组富有机质页岩的地球化学特征以及页岩油有利勘探区。饱和烃色谱质谱分析显示:烃类以短链正构烷烃(nC_9—nC_(19))为主,ααα20RC_(27)规则甾烷占优势,奥利烷相对含量较低,有机质以藻类、浮游生物为主。Pr/Ph受成熟度影响比较小,基本记录了沉积阶段及成岩作用早期的氧化还原环境。二苯并噻吩/菲与姥鲛烷/植烷关系显示二白斑组沉积环境-岩石相东西方向上存在较大变化,在阿尔伯塔东部为强还原环境,中西部为弱还原环境,在西部还原性增强。另一方面,由于所有实验室热解产物通常含有大量的极性、高分子化合物,使得把惰性碳算在内的质量平衡模型高估烃源岩的生烃潜量。针对此问题,应用死碳矫正新方法对二白斑组成熟—高成熟烃源岩原始有机碳含量、原始生烃潜量进行恢复,并探讨潜在的页岩油压裂生产有利区,认为除研究区中—西部5口井烃源岩镜质体反射率大于0.5%外,其余井的残留油均未达到工业开采价值。
[Abstract]:Based on the analysis of rock pyrolysis, gas chromatography-mass spectrometry, organic geochemistry and X-ray diffraction of core samples from 9 wells, the geochemical characteristics of organic matter rich shale of Erbaiban formation in western Canada basin and the favorable exploration area for shale oil are discussed. The results of saturated hydrocarbon chromatography-mass spectrometry showed that the main hydrocarbons were short chain normal alkanes (nC_9-nC_ (19), 伪 20RC _ (27) regular steranes dominated, the relative content of olinanes was low, and the organic matter was algae. Plankton is dominant. Pr/Ph is less affected by maturity, and basically records the redox environment of sedimentary stage and early diagenesis. The relationship between dibenzothiophene / phenanthrene and baskestane / phytane shows that there is a great change in the east-west direction of the sedimentary environment and rock facies of the dibenzothiophene / phenanthrene group. It is a strong reducing environment in the eastern part of Alberta, a weak reductive environment in the central and western part, and a strong reductive environment in the west. On the other hand, due to the fact that all laboratory pyrolysis products usually contain a large number of polarity and polymer compounds, the mass equilibrium model, which takes inert carbon into account, overestimates the hydrocarbon generation potential of the source rock. In order to solve this problem, a new method of dead carbon correction is applied to recover the original organic carbon content and potential hydrocarbon generation potential of mature and highly mature source rocks of Erbai Bian formation, and to explore the potential favorable areas for shale oil fracturing production. With the exception of vitrinite reflectance of source rock in 5 wells in the central and western part of the study area, it is considered that the residual oil of the remaining wells has not reached the value of industrial exploitation except that the reflectivity of the vitrinite is greater than 0.5%.
【作者单位】： 中国地质大学能源学院;卡尔加里大学地球科学系;中国石油新疆油田分公司博士后工作站;
【基金】：国家自然科学基金(41273062;41573035)
【分类号】：P618.13
本文编号：2410638
[Abstract]:Based on the analysis of rock pyrolysis, gas chromatography-mass spectrometry, organic geochemistry and X-ray diffraction of core samples from 9 wells, the geochemical characteristics of organic matter rich shale of Erbaiban formation in western Canada basin and the favorable exploration area for shale oil are discussed. The results of saturated hydrocarbon chromatography-mass spectrometry showed that the main hydrocarbons were short chain normal alkanes (nC_9-nC_ (19), 伪 20RC _ (27) regular steranes dominated, the relative content of olinanes was low, and the organic matter was algae. Plankton is dominant. Pr/Ph is less affected by maturity, and basically records the redox environment of sedimentary stage and early diagenesis. The relationship between dibenzothiophene / phenanthrene and baskestane / phytane shows that there is a great change in the east-west direction of the sedimentary environment and rock facies of the dibenzothiophene / phenanthrene group. It is a strong reducing environment in the eastern part of Alberta, a weak reductive environment in the central and western part, and a strong reductive environment in the west. On the other hand, due to the fact that all laboratory pyrolysis products usually contain a large number of polarity and polymer compounds, the mass equilibrium model, which takes inert carbon into account, overestimates the hydrocarbon generation potential of the source rock. In order to solve this problem, a new method of dead carbon correction is applied to recover the original organic carbon content and potential hydrocarbon generation potential of mature and highly mature source rocks of Erbai Bian formation, and to explore the potential favorable areas for shale oil fracturing production. With the exception of vitrinite reflectance of source rock in 5 wells in the central and western part of the study area, it is considered that the residual oil of the remaining wells has not reached the value of industrial exploitation except that the reflectivity of the vitrinite is greater than 0.5%.
【作者单位】： 中国地质大学能源学院;卡尔加里大学地球科学系;中国石油新疆油田分公司博士后工作站;
【基金】：国家自然科学基金(41273062;41573035)
【分类号】：P618.13
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