准噶尔盆地玛湖斜坡八道湾组低含油饱和度油藏地球化学特征分析
Analysis of Geochemical Characteristics of Low Oil Saturation Reservoirs of Badaowan Formation in Mahu Slope,Junggar Basin,China
徐伯东 1邹贤利 2吴新豫 3赵文苹 3王爱霞 3许涛 2赵晓东2
作者信息
- 1. 中国石油大学(北京),北京 102249
- 2. 中国石油大学(北京)克拉玛依校区,新疆 克拉玛依 834000
- 3. 中国石油新疆油田分公司,新疆 克拉玛依 834000
- 折叠
摘要
准噶尔盆地玛湖凹陷斜坡中浅层发现了侏罗系八道湾组低含油饱和度油藏,但是老井试油后产量不一,油藏"甜点"识别困难.为此,利用油气地球化学参数,对八道湾组油藏地球化学特征进行研究.结果表明:八道湾组低含油饱和度油藏原油的生物标志化合物特征对分析原油特点和原油成因具有显著的表征意义,原油普遍具有β-胡萝卜烷和γ-蜡烷丰度高的特征,为典型二叠系风城组烃源岩的产物.其中,低产井原油的γ-蜡烷丰度相对偏低,Ts/Tm较大;高产井原油的γ-蜡烷丰度较高,Ts/Tm偏小,色层效应是造成原油间生物标志化合物差异的主要原因.综合分析认为,断裂沟通方式及油藏充注过程影响了油气的聚集程度,晚期构造掀斜调整形成的八道湾组低含油饱和度油藏更具有勘探潜力.研究结果可为玛湖凹陷下一步勘探开发提供思路和方向.
Abstract
Low oil saturation reservoirs of the Jurassic Badaowan Formation have been discovered in the shallow and middle layers of the slopes of Mahu Sag in Junggar Basin,but the production rates of the old wells are different after the production test,and it is difficult to identify the"sweet spots"of the reservoirs.Therefore,the geochemical characteristics of Badaowan Formation reservoirs were investigated using oil and gas geochemical parameters.The results show that the biomarker compounds of the crude oils from low oil saturation reservoirs of Badaowan Formation are of great significance in identifying the similarities and differences of crude oils and analyzing the genesis of crude oils.The crude oils are generally characterized by a high abundance of β-carotene and γ-cerane,which are the products of the typical hydrocarbon source rocks of the Permian Fengcheng Formation.Among them,the γ-cerane abundance of crude oils from low-production wells is relatively low,and Ts/Tm is large;the γ-cerane abundance of crude oils from high-production wells is high,and Ts/Tm is small.The chromatography effect is the main reason for the differences in biomarker compounds among crude oils.Comprehensive analysis shows that the fault commu-nication mode and reservoir filling process affect the oil and gas accumulation,and the low oil saturation reservoirs in Badaowan Formation formed by tectonic tilts and adjustments in the late period have more exploration potential.Study results could provide ideas and directions for the next exploration and development in Mahu Sag.
关键词
生物标志化合物/低含油饱和度油藏/色层效应/原油成因/八道湾组/玛湖凹陷Key words
biomarker compound/low oil saturation reservoir/chromatography effect/crude oil genesis/Badaowan Formation/Mahu Sag引用本文复制引用
基金项目
新疆维吾尔自治区自然科学基金(2023D01A20)
出版年
2024
国家科技期刊平台
NSTL
万方数据