In line with the exploration in Tuba basin, the principles, suitability and parameter selection results of using reservoir scale sequence and reserves analysis method to calculate petroleum economic coefficient are studied.

The 1970s was a prosperous period of Saudi Arabia's petroleum economy.

The current application saturation of information technology in petroleum and geochemical industry was introduced briefly, the positive influences of information technology from1998 to now on petroleum economy were reviewed and its application prospect in petroleum industry was forecasted in the paper.

The petroleum economy in our country today is in serious disorder.

Based on the indexes system three coefficients including coordinate coefficient, sustainability coefficient and economic coefficient are defined.

49 varieties (lines) including diploid,quadruploid and hexaploid analyzed in this paper using grey correlation analysis reveals that 1000-grain weight has the greatest contribution to economic coefficient; spikelet number has the greatest correlation with plant height,spike length and kernel per spike; and economic production has the greatest correlation with dry weight and tillering.

The correlation between economic coefficient and 13 characters ,that is biology yield,plant height,wheat neck length, wheat neck thickness, sword leaf length, sword leaf width, seed setting spikelet number, sterile spiketlet number, spike length, spikelet density, grain number per stachys, grain weight per stachys and stem thickness were analysed on 10 wheat varieties (strains)from Hubei Province.

It offers a method of exergy-economic coefficient, analyzes natural gas co-generation system, power system and natural gas combined heat and power system, and also calculates the exergy-economic coefficients of three systems, analyzes them and then obtains that natural gas co-generation system has higher thermal economy.