超压抑制有机物成熟的镜质反射率预测模型

IF 1.5 4区 地球科学 Q2 GEOLOGY
Journal of Geology Pub Date : 2020-02-06 DOI:10.1086/707237
Maoguo Hou, M. Zha, Xiujian Ding, Ablimit Imin, R. Lai, Shouxu Pan, Yutao Ding
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引用次数: 1

摘要

镜质组反射率是研究烃源岩评价、成岩阶段划分、盆地模拟和成岩作用最常用的指标。由于镜质组反射率的数据有限,已经提出了许多预测模型来解决这个问题。然而,这些模型可能无法有效预测超压盆地中的镜质组反射率,因为超压会抑制有机质的成熟。过压似乎降低了烃生成反应系统中的无序程度,并增加了对抗孔隙流体力的机械功,该力随着活化复合物体积的增加而发生,从而降低了前置因子并增加了烃生成过程的活化能;因此,有机物的成熟减慢。本文分析了超压系统中镜质组反射率异常低的原因,揭示了超压对有机质成熟的显著抑制作用。根据准噶尔盆地阜康凹陷的井资料,提出了一种新的镜质组反射率预测模型A-Ea-Ro,以解释有机质成熟过程中超压的抑制作用。通过在该模型中引入预因子和活化能来对超压进行建模。根据钻探、地球化学实测数据和模拟数据,采用非线性约束规划方法对超压控制因子进行了优化,分别为151.23MPa和30.65kJ·mol−1·MPa−1。将A-Ea-Ro等预测模型应用于阜康凹陷福10井和穆7井。应用于Fu10和Mu7井的A-Ea-Ro模型预测的反射率值与测量值非常一致。该模型为该研究区域的镜质组反射率预测值和观测值提供了更接近的匹配。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Prediction Model of Vitrinite Reflectance for Suppression of Organic-Matter Maturation by Overpressure
Vitrinite reflectance is the most commonly used index in the study of source rock evaluation, diagenetic stage division, basin simulation, and diagenesis. Because data on vitrinite reflectance are limited, many prediction models have been proposed to address this problem. However, these models may fail to predict vitrinite reflectance effectively in overpressured basins because overpressure can suppress organic-matter maturation. Overpressure appears to reduce the degree of disorder in the hydrocarbon generation reaction system and to increase the mechanical work against the force of pore fluid that occurs as the volume of the activated complex increases, thereby reducing the preexponential factor and increasing the activation energy of the hydrocarbon generation reaction; therefore, organic-matter maturation is slowed. In this article, the reasons for the abnormally low vitrinite reflectance in the overpressured system were analyzed, which revealed that overpressure is interpreted as significantly suppressing organic-matter maturation. A new prediction model for vitrinite reflectance, A-Ea-Ro, is proposed that accounts for the suppression of overpressure in organic-matter maturation based on data from wells in the Fukang Sag in the Junggar Basin, northwestern China. The overpressure is modeled by introducing a preexponential factor and activation energy in this model. Based on measured drilling and geochemical data and simulated data, the overpressure controlling factors were optimized by a nonlinear constrained programming method and assigned 151.23 MPa and 30.65 kJ·mol−1·MPa−1, respectively. Prediction models including A-Ea-Ro were applied to wells Fu10 and Mu7 of Fukang Sag. The reflectance values predicted by the model A-Ea-Ro, applied to wells Fu10 and Mu7, were in good agreement with the measured values. This model provides a closer match between predicted and observed vitrinite reflectance values for this study area.
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来源期刊
Journal of Geology
Journal of Geology 地学-地质学
CiteScore
3.50
自引率
5.60%
发文量
0
审稿时长
3 months
期刊介绍: One of the oldest journals in geology, The Journal of Geology has since 1893 promoted the systematic philosophical and fundamental study of geology. The Journal publishes original research across a broad range of subfields in geology, including geophysics, geochemistry, sedimentology, geomorphology, petrology, plate tectonics, volcanology, structural geology, mineralogy, and planetary sciences. Many of its articles have wide appeal for geologists, present research of topical relevance, and offer new geological insights through the application of innovative approaches and methods.
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