The Identification And Evaluation Of Excellent Source Rockin Tanan Sag And Nanbeier Sag

We ofen see the words"High-quality hydrocarbon source rock"which are generally called"Excellent Source Rock"in the english literaturese. Excellent source rock refers to the source rocks which have special enrichment organic, good types and great potential of hydrocarbon generation, they usually is not sick, but have a bigger contribution to the formation of oil and gas accumulation. scholars gradually pay attention to the identifying and evaluating of excellent source rocks due to the existence of Excellent Source Rocks tend to control the large reservoir formation.Nanbeier sag and tanan sag of tamuchage basin are The two most important depression where petroleum gathered. With the deepening of the research on terrestrial origin hydrocarbon generation theory and practice of oil exploration, petroleum geological workers recognize that the excellent source rocks plays an important role in the reservoir formation of the two sag, but lack of enough understanding about the characteristics and distribution of the excellent source rocks in this region. This paper analyzes and studies the development, organic geochemistry characteristic and the generation and expulsion characteristics of hydrocarbon of the source rocks in nanbeier sag and tanan sag. Results show that the nanbeier sag and tanan sag existe excellent source rcks, and excellent source rocks are mainly distributed in the upper segment of nanyi length, followed by special lithology section, and the naner segment has a small distribution too. Then according to actual situation of study area, combining the domestic and abroad hydrocarbon source rocks evaluation standards, evaluated high-quality hydrocarbon source rocks, using the comprehensive evaluation method. The evaluation results show that excellent source rocks are mainly distributed in the upper segment of nanyi length, followed by special lithology section,and the naner segment has a small distribution too. The upper segment of nanyi length is the most development segment. The high-quality hydrocarbon source rocks of nanbeier sag are mainly distributed in east sub-depression, high-quality hydrocarbon source rocks existe in west sub-depression, but a smaller number. The biggest distribution area of excellent source rocks of tanan sag is located in the upper segment of nanyi length, the excellent source rocks distribute in east sub-depression, west sub-depression and middle sub-depression. The excellent source rocks area is reduced in special lithology section, and mainly distributed in middle sub-depression of tanan sag. There are a small number of high-quality hydrocarbon source rocks in naner segment of west sub-depression and middle sub-depression of tanan sag.the thickness of excellent source rocks is 50~100 meters in commonly.