Evaluation method of sandstone reservoir porosity through thermal decomposition weightlessness

Key words:  sandstone reservoir  rock thermal decomposition  reservoir evalualxon  thennal decomposition weightlessneaa

Abstract:

It is very important for finding oil and gas in the exploralory well or evaluating water-flooded layer in the development well to evaluate reservoir physical property and oil bearing an location by using the advaniage of logging data. A calcuia-tion method of rock framework weight modified by shale and carbonate content was presented, and the evaluation model o￡ reservoir porosity thermal decomposition weightlessness was improved by analyzing the main influence factor of rock thermal decomposition weightlessness and considering the heat program of rock pyrologger. Ttiis model was applied in MinghuHzhen group of well Gang 5-26-2 in Gartgdong Oilfield and ZaoV group of well Guan 50-4-4 in Wangguantun Oilfield, northern of Huanghua depression. Compared with the reBiiit of bore core laboratory analysis and the result of well kjg interpretation, the precision of computing reservoir availability porosity is relatively high and its average relative error is not more than S%.