【摘要】：通過對9口井巖心樣品巖石熱解、氣相色譜質譜、有機地球化學和X射線衍射分析,探討了西加拿大盆地二白斑組富有機質頁巖的地球化學特征以及頁巖油有利勘探區(qū)。飽和烴色譜質譜分析顯示:烴類以短鏈正構烷烴(nC_9—nC_(19))為主,ααα20RC_(27)規(guī)則甾烷占優(yōu)勢,奧利烷相對含量較低,有機質以藻類、浮游生物為主。Pr/Ph受成熟度影響比較小,基本記錄了沉積階段及成巖作用早期的氧化還原環(huán)境。二苯并噻吩/菲與姥鮫烷/植烷關系顯示二白斑組沉積環(huán)境-巖石相東西方向上存在較大變化,在阿爾伯塔東部為強還原環(huán)境,中西部為弱還原環(huán)境,在西部還原性增強。另一方面,由于所有實驗室熱解產物通常含有大量的極性、高分子化合物,使得把惰性碳算在內的質量平衡模型高估烴源巖的生烴潛量。針對此問題,應用死碳矯正新方法對二白斑組成熟—高成熟烴源巖原始有機碳含量、原始生烴潛量進行恢復,并探討潛在的頁巖油壓裂生產有利區(qū),認為除研究區(qū)中—西部5口井烴源巖鏡質體反射率大于0.5%外,其余井的殘留油均未達到工業(yè)開采價值。
[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), 偽 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%.
【作者單位】： 中國地質大學能源學院;卡爾加里大學地球科學系;中國石油新疆油田分公司博士后工作站;
【基金】：國家自然科學基金(41273062;41573035)
【分類號】：P618.13

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