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Prediction of Element and Clay Mineral Content in Lacustrine Mudstone Using Logging Data: an example from Dongying Depression
Author(s) -
CHEN Zhonghong,
HUANG Wei,
SUN Tengkui,
WANG Xiaoyang,
CHEN Zhiqiang
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12306_9
Subject(s) - geology , logging , clay minerals , depression (economics) , geochemistry , well logging , content (measure theory) , mineral , mineralogy , petroleum engineering , forestry , chemistry , mathematics , geography , mathematical analysis , economics , macroeconomics , organic chemistry
Clay minerals are main components in shale and mudstone, different components including montmorillonite, Illite/montmorillonite (I-S) mixed layer, illite and chlorite in shale have different gas sorption capacity. Therefore, further analysis and evaluation on the components of clay minerals is necessary for evaluating the mechanism of shale gas existence. Clay minerals are composed by various elements, and different element contents reflect different minerals. The distribution of different element varies with the transportation, sedimentation and diagenesis of sediments, and many inorganic element ratio parameters have been used to recover sedimentary environment and ancient climate. Therefore, inorganic element geochemistry as well as mineralogy and microbiology, is increasingly important in the research and exploration in unconventional shale gas. However, sufficient clay mineral and inorganic element information is difficult to obtain through actual measurement, and the prediction of clay mineral and inorganic element using logging data to is necessary for evaluating the mechanism of shale gas existence. The lower part of Member 3 of Paleogene Shahejie Formation (Es3) were one of the main source rock intervals with relative large burial depth in Dongying sag, eastern China (Chen and Zha, 2006). The Es3 source rocks deposited in lacustrine brackish water condition with semi-deep to deep lacustrine facies, and the main lithology were massive mudstone, grey brown oil shale and pure shale. This interval reached moderate maturity to high maturity thermal evolution stage, therefore, not only oil was abundant, but also considerable natural gas was generated, which formed coexisted situation of oil and gas. This article is mainly to describe classification, distribution of this Paleogene Es3mudtones, and use logging data to predict elements in mudstone.