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  2. 地质与地球物理研究所
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  4. 中国科学院油气资源研究重点实验室
Calibration of the mudrock compaction curve by eliminating the effect of organic matter in organic-rich shales: Application to the southern Ordos Basin, China

文献类型：期刊论文

作者Li, Chao1,2; Zhang, Likuan1; Luo, Xiaorong1; Zhang, Liqiang3; Hu, Caizhi4; Qi, Yukai4; Lei, Yuhong1; Cao, Binfeng1; Cheng, Ming1; Yu, Yuxi1
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2017-09-01
卷号86页码:620-635
关键词Compaction curve Acoustic transit time Kerogen Source rock Overpressure Ordos Basin
ISSN号0264-8172
DOI10.1016/j.marpetgeo.2017.06.027
文献子类Article
英文摘要The mudrock log-derived compaction curve is a significant tool for investigating the primary migration of hydrocarbon, predicting fluid overpressure, estimating formation erosion thicknesses and restoring the buried history and paleo-structure of a basin. However, the presence of kerogen in organic-rich shales can create typically high logging values of the acoustic transit time. Thus, the abnormally high values of the acoustic transit time for organic-rich rocks may not truly reflect the porosity variations of subsurface rocks, leading to great uncertainties in the understanding of the mudstone compaction and a certain amount of error in the abnormal fluid pressure estimation when using the mudrock log-derived compaction curve. Therefore, it is necessary to recalibrate the mudstone compaction curve by eliminating the increment of the acoustic transit time caused by the kerogen content of organic-rich mud stones. Taking the southwest Ordos Basin as an example, this paper presents a new equivalent volume model based on the composition of organic-rich shale in which the kerogen content is also considered. Based on the quantitative relationship between the rock composition and the acoustic transit time, a quantitative formula for calculating the acoustic transit time increment caused by the kerogen is derived. This formula shows that the increment depends not only on the organic content but also on the occurrence state, pore size, pore fluid composition and other factors. X-ray diffraction (XRD) data were used to determine the main mineral composition of the mudstone and to calculate the acoustic transit time of the rock skeleton. Then, the mudstone compaction curve in the Zhenjing area was calibrated by combining the measured porosity and total organic carbon (TOC) of the mudstone based on the correction formula. The compaction characteristics varied significantly between before and after the calibration. The slope of the normal compaction trend (NCT) line decreased by 30-55%, and the acoustic transit time deviation from the NCT in the undercompaction interval decreased significantly. The overpressure at the maximum burial depth estimated by the equivalent depth method is in better agreement with the results obtained by numerical simulation after the calibration, and the porosity determined from the well log after the calibration is also closer to the true measured value. The method proposed in this paper is of great significance for improving the reliability and accuracy of compaction research on organic-rich mudstones, especially for the accurate estimation of abnormal pressure in the source rock layer. Additionally, it can be used as an effective reference for mudstone compaction studies in similar geological settings areas or basins. (C) 2017 Elsevier Ltd. All rights reserved.
WOS关键词EXPERIMENTAL MECHANICAL COMPACTION ; PORE-PRESSURE PREDICTION ; SEDIMENTARY BASINS ; EFFECTIVE STRESS ; SOURCE ROCKS ; OVERPRESSURE ; DIAGENESIS ; MUDSTONES ; POROSITY ; SEA
WOS研究方向Geology
语种英语
WOS记录号WOS:000411296600039
出版者ELSEVIER SCI LTD
资助机构National Natural Science Foundation of China(41372151) ; National Science and Technology Major Project(2017ZX05008-004) ; CAS-CNPC Strategic Cooperation Project(RIPED-2015-JS-272) ; National Natural Science Foundation of China(41372151) ; National Science and Technology Major Project(2017ZX05008-004) ; CAS-CNPC Strategic Cooperation Project(RIPED-2015-JS-272) ; National Natural Science Foundation of China(41372151) ; National Science and Technology Major Project(2017ZX05008-004) ; CAS-CNPC Strategic Cooperation Project(RIPED-2015-JS-272) ; National Natural Science Foundation of China(41372151) ; National Science and Technology Major Project(2017ZX05008-004) ; CAS-CNPC Strategic Cooperation Project(RIPED-2015-JS-272)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61971]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Zhang, Likuan
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.China Univ Petr East China, Sch Geosci, Qingdao 266580, Peoples R China
4.SINOPEC Petr Explorat & Prod Res Inst, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Li, Chao,Zhang, Likuan,Luo, Xiaorong,et al. Calibration of the mudrock compaction curve by eliminating the effect of organic matter in organic-rich shales: Application to the southern Ordos Basin, China[J]. MARINE AND PETROLEUM GEOLOGY,2017,86:620-635.
APA Li, Chao.,Zhang, Likuan.,Luo, Xiaorong.,Zhang, Liqiang.,Hu, Caizhi.,...&Yu, Yuxi.(2017).Calibration of the mudrock compaction curve by eliminating the effect of organic matter in organic-rich shales: Application to the southern Ordos Basin, China.MARINE AND PETROLEUM GEOLOGY,86,620-635.
MLA Li, Chao,et al."Calibration of the mudrock compaction curve by eliminating the effect of organic matter in organic-rich shales: Application to the southern Ordos Basin, China".MARINE AND PETROLEUM GEOLOGY 86(2017):620-635.

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来源：地质与地球物理研究所

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