石油勘探与开发2001，Vol.28Issue(2)：15-18,4.
酒西盆地油气形成与勘探方向新认识（二）——烃源岩成烃演化与主力油源确认
Opinions on oil and gas generation and exploration in Jiuxi basin (Ⅱ)—Determination of process of hydrocarbon generating and the principal oil source rock.
陈建平 1陈建军 2张立平 1钟宁宁3
作者信息
- 1. 中国石油勘探开发研究院
- 2. 玉门油田公司
- 3. 石油大学(北京)
- 折叠
摘要
Abstract
The threshold of oil generating is distinctly different in several sags of Jiuxi basin. Maturity of Lower Cretaceous source rock, researched by the authors, is closely relative to the deposition thickness of the Tertiary and the Quaternary. It shows that source rock at the depth of 4,000-4,400m is low mature, and 4,400-5,200m is in the peak of oil generating. Correspondingly, the source rock of the Zhonggou Formation is immature; the Upper Xiagou Formation is low mature; and the Lower Xiagou Formation and the Upper Chijinpu Formation are in the peak of oil-generating; and the Lower Chijinpu Formation is at the stage of generation of condensate-wet gas with high maturity. There is no source rock reaching the overmature stage of dry gas at present. In the Shibei sag, the threshold is about 3,000m, which is apparently different from that of the Qingnan sag. Only deeply buried source rock of Chijinpu Formation reaches the mature stage. Revealed by the burial and thermal evolution history of the source rock, the low Cretaceous source rock was shallowly buried at the end of Cretaceous period. The main oil generating stage is in late of the Neogene period. There is only one time of hydrocarbon generating and expulsing in geological history of the basin. The characters of oil samples from different oil fields are very similar in Jiuxi basin. Aquatic organisms of early Cretaceous are the principal precursors of oil generating, disclosed by the stable carbon isotopic ratio and character of biomarkers. The Chijinpu Formation is the major source rock, and relatively, the Xiagou Formation is subordinate.关键词
酒西盆地/早白垩世/生油岩评价/热演化/油源对比/原油对比分类
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陈建平,陈建军,张立平,钟宁宁..酒西盆地油气形成与勘探方向新认识（二）——烃源岩成烃演化与主力油源确认[J].石油勘探与开发,2001,28(2):15-18,4.
