摘要
优质烃源岩一词在英文文献中经常见到,一般称作“Excellent Source Rock”。优质烃源岩是指有机质特别富集、类型好、生烃潜力大的烃源岩,它们往往厚度不大,但却对油气聚集的形成具有较大贡献。由于优质烃源岩的存在往往控制着大型油气藏的形成,优质烃源岩的识别与评价逐渐被学者们所重视。
南贝尔凹陷和塔南凹陷是塔木查格盆地中两个最重要的油气聚集地。随着陆相生油理论研究的深入和石油勘探的实践,石油地质工作者认识到,优质烃源岩对这两个凹陷油气藏的形成具有举足轻重的作用,但对该地区优质烃源岩特征与分布却缺乏足够的认识。本文对南贝尔凹陷和塔南凹陷烃源岩的发育、有机地球化学特征和生排烃特征进行了深入研究,结果表明南贝尔凹陷和塔南凹陷存在优质烃源岩,且优质烃源岩主要分布在南一上段,其次是特殊岩性段,在南二段有少量分布。随后本文根据研究区实际状况结合国内外烃源岩评价标准,采用综合赋分法制定了优质烃源岩评价标准,进一步对优质烃源岩进行评价。评价结果表明,南贝尔凹陷和塔南凹陷优质烃源岩主要分布在n1上段,其次是n2段和tsyxd,n1上段是优质烃源岩最发育的层段。南贝尔凹陷优质烃源岩主要分布在东次凹,西次凹存在优质烃源岩,但数量较少。塔南凹陷n1上段优质烃源岩分布面积大,塔东、塔中和塔西均有分布,tsyxd优质烃源岩面积减小,且主要分布于塔中次凹。n2段只有塔中和塔西分布有少量的优质烃源岩。优质源岩厚度一般在50~100m。
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.
引文
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