Keywords: 
• high effective gas source kitchen /
• high effective gaspool /
• major gas generation period /
• evaluation index /
• oil cracked gas source kitchen

Abstract: Concept, connotation and evaluation index of high effective gas source kitchen are discussed in the papere. High effective gas source kitchen refers to those that not only has high abundance of organic matter and good quality type of source rockswhich can generate large amount of gas under the geothermal and biology action, but also has a good coincidence with the large scale gas accumulation and pool forming in time and space, therefore, it plays an important role in the formation of large and medium gas pool. High effective gas source kitchen includes two profiles connotation, that are material basis and thermal kinetics process of gas generation. So, the evaluation index are discussed from three features as follows: the first is high intensity of gas generation ( generally larger than 20 ×10⁸m³ /km² ) , derived from large and medium gas field advocated by Jinxing-Dai; the second is short action time ofmain gas generation period, which is confirmed through gas generation kinetics studies of source rocks of typeⅠ, Ⅱ and Ⅲ and crude oil, and the statistic analysis ofmain gas generation time ofmain gas source rocks in China, the major gas generation period of high effective gas source kitchen is usually less than 40Ma, especially better less than 20Ma. The third is that ending time of major gas generation period is very close to present, which is important to the formation of gas accumulations in the late stage. The contributions of high effective gas source kitchen to the formation of high effective gas pool lies in high rate of gas supply resulting in high effective accumulation and migration of gas, besides little loss of natural gas etc. According to the type of source rocks and kinetics process of gas generation, three groups,including six sub-groups, of high effective gas source kitchens are classified in China.