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| LOGGING INTERPRETATION AND REGIONAL PREDICTION OF MUDSTONE BREAKTHROUGH PRESSURES IN THE UPPER PALEOZOIC,SOUTH ORDOS BASIN |
| SHI Hong-cui, ZHOU Jiang-yu, WANG Long-zhang, SUN Mei-jing, XIANG Yuan-gao |
| Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China |
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Abstract The breakthrough pressure is the key parameter in evaluating the sealing capabilities of mudstone caprock. Through the correlation analysis of measured core pressures and logging data, the equation between the acoustic transit time and the breakthrough pressure was established and, on such a basis, the vertical and plane variation characteristics of mudstone breakthrough pressures in the Upper Paleozoic of south Ordos Basin were studied. The result showed that pressure values in the west and north areas were higher than those in the south and east, and pressure differences in the east-west direction were remarkable. Due to high deposition rate and clay content in the wide lake facies developed from early Middle Permian and rapid subsidence of basin from Late Triassic to Early Juassic, liquid discharge of mudstone in the Upper Shihezi Formation was blocked during the overlying compaction that caused abnormal high pressures and relatively low breakthrough pressures. Before and during the deposition of Lower Dhihezi Formation, high breakthrough pressures were distributed in arc along Qingyang, Yanan and Yichuan, low pressures were in the SW direction of the study area, while from the Upper Shihezi Formation period, low pressure distribution direction changed gradually southeastward and high pressures transferred from the east and northeast of the study area to the west and southwest.
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Received: 15 April 2013
Published: 10 February 2014
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