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Overpressure Study and Prediction in Hinterland Area of Junggar Basin

Author: ZhangYongGang
Tutor: HeSheng
School: China University of Geosciences
Course: Mineral prospecting and exploration
Keywords: Central Junggar Basin High pore fluid pressure Seismic velocity Overpressure unit Overpressure Overpressure prediction
CLC: P618.13
Type: Master's thesis
Year: 2005
Downloads: 300
Quote: 1
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Abstract

The petroliferous basins found abnormally high pore fluid pressure (overpressure) is a fairly common phenomenon, it is one of the causes of the reservoir formation that is a highly complex phenomenon of self-organization Geodynamics. From the 50s of the last century, with the depth of the increase in oil and gas exploration, it was discovered that many petroliferous basins deep often developed abnormally high pore fluid pressure, and it threatens the safety of the drilling project and led directly to find the increase in oil costs, since then causes of abnormally high pressure research and prediction extensive attention and strengthened. The current domestic and international in Overpressure research mainly from overpressure causes pressure sealing mechanism, pressure distribution, the use of integrated geophysical and geological data to predict aspects of overpressure, ancient overpressure and pressure evolution simulation start working. Pressure long and deep basin gas pressure anomalies in the relationship of the oil and gas combined, has opened up new areas of finding. The thesis central Junggar Basin overpressure and distribution, and predicted overpressure of the study area. Geology, drilling, logging, testing, and seismic data, the anatomy of a single well known overpressure phenomenon characteristics and origin, known overpressure geological and geophysical parameters response relationship, and forecast ultra pressure main methods and influencing factors of, Jason Software Prediction deep overpressure through the seismic velocity data, geological and seismic data analysis of the structure and distribution characteristics of overpressure with the analysis of the relationship between the overpressure and the oil and gas. According to the the basin measured pressure data we can see, the Junggar Basin generally dysplasia and pressure. On a flat surface, Maqiao raised, Mo North Shixi, heather, Miss South based East Xiayan southern piedmont zone and four trees dent internal abnormally high pressure characteristics, the distribution area of 7 × 10 ~~ 4km ~ 2. Overpressure appears stratigraphic horizon for some overpressure measured in the Permian, Triassic and Jurassic, Carboniferous and Tertiary. Changes in the depth range of the pressure distribution, the drilling results have been found about 1500m. Tertiary overpressure may mainly with overthrusting Tectonic extrusion, and or undercompaction. Study area overpressuring effectiveness of hydrocarbon generation, compaction, diagenesis and tectonic activity. Typical well drilling mud logging data and measured pressure data for a comprehensive analysis of clay mineral analysis combined with some well known the overpressure developed strata physical response to: with respect to a normal acoustic time trends, sandstone, siltstone and mudstone sound waves, when the difference between the common the high jet lag exception; significantly lower relative to the normal trend of apparent resistivity, mudstone apparent resistivity anomaly; sonic velocity in deep overpressure with significantly reversed low. Density and shale porosity Basin abdominal overpressure may be implemented with mudstone undervoltage no direct relationship with the the thermal role that hydrocarbon generation, particularly natural gas generation and fluid thermal expansion. Overpressure layer that has low-speed characteristics of geophysical data and seismic interpretation and inversion software, get well layer velocity profile of the survey line. Known to exist within in the region with more lower velocity anomalies, the abnormally high pressure in the plane is not a whole, but more pressure unit; Changji sag the internal abnormal pressure is not distributed along the layers, but the wear layer distribution. Improve velocity data reliability, selection and improvement of overpressure prediction method, derived the distribution characteristics of the formation pressure and overpressure size, to provide a basis for our area of oil and gas exploration and development. Permian and Jurassic source rocks in the presence of large-scale super pressure: hydrocarbon source rocks in the activity is still active,

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