{'fraction_non_alphanumeric': 0.019809825673534072, 'fraction_numerical': 0.0, 'mean_word_length': 6.217142857142857, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
RESERVOIR QUALITY REDUCTION CAUSED BY CLAY INDUCED DUCTILITY

Ductile components including rock fragments, clay, and matrix material are often consideredas the most important factors that control quality of shaly sandstones, which areusually characterized by low porosity and permeability. In presence of ductile components,the degree of quality reduction is affected mainly by distribution, occurences, andamounts of the ductile components. Therefore, the presence of ductile components affectsrock petrophysics, and consequently has effect on fluid movements in reservoir duringproduction.This paper presents results of the study on plug samples taken from five wells fromvarious fields in Cooper Basin (Tirrawarra Sand), South Australia. The samples were studiedpetrographically using x-ray diffraction, optical petrography, and scanning electronemicroscope. The results were integrated with routine and special core analysis data. Theoverall results show that the distribution and the amount of ductile components have significantlyreduced porosity, hence the quality of the reservoir. However, the effect isdifferent for different types of porosity, and this certainly is valuable addition to our understandingover permeability behavior of shaly sandstones.