摘要
利用热分析、可溶有机质分析、干酪根镜质体反射率及生物标志物参数等,对与油藏有密切关系的延长组长8—长7段进行了热成熟度研究。烃源岩热解峰温、沥青和烃转化率、Ro值、OEP值、C29ααα-20S/(20S+20R)甾烷参数值和C31αβ-22S/(22S+22R)藿烷参数值均指示,长8—长7段烃源岩整体处于大量生烃的成熟有机质演化阶段,并已达到生油高峰,具备有利的生排烃条件。尽管西峰地区不同井位的构造位置和现今地层埋深各不相同,但经历了相近的沉降与热演化历史,长8—长7段烃源岩具有一致的热演化程度。为全面揭示鄂尔多斯盆地西南部西峰地区延长组烃源岩的生、排烃能力,提供了基础资料。
In order to comprehensively reveal the hydrocarbon generation and expulsion ability of source rocks of the Yanchang Formation in Xifeng area, Southwestern Ordos Basin, the authors investigates the maturity degree of source rocks in the Member 8 and 7 of Yanchang Formation which are closely related to the reservoir. pyrolysis analysis, dissolvable organic matter analysis, vitrinite reflectance of kerogen and biomarker parameter are applied in the research. The peak temperatures of Rock-Eval pyrolysis, conversion rates of bitumen and hydrocarbon, Ro values, OEP values, sterane parameter C29ααα-20S/(20S+20R) and hopane parameter C31αβ-22S/(22S+22R) all indicate that the source rocks in Member 8 and 7 are in the mature stage of organic matter and have reached the peak of hydrocarbon generation. Therefore the source rocks have provided with advantageous conditions to generating and expulsion of hydrocarbon. Although the structure position and buried depth of strata of different wells in Xifeng area are difference at present, the source rocks in Member 8 and 7 of Yanchang Formation have identical thermal evolution because of the similar subsidence history and thermal history. The study provides the basic information for wholly revealing the generating and expulsing ability of the source rocks in the formation.
出处
《西南石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第3期28-31,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
中国科学院'西部之光'与甘肃省中青年科技项目(AC2002-404)。
关键词
延长组
烃源岩
热成熟度
西峰油田
鄂尔多斯盆地
Yanchang formation
source rock
thermal maturity degree
Xifeng oil field
Ordos basin
