银额盆地哈日凹陷巴音戈壁组精细油源对比

doi:10.11743/ogg20190418

摘要/Abstract

摘要： 近年来，银额盆地哈日凹陷的油气勘探取得了一些成果，但该凹陷地质条件复杂、勘探难度极大，且随着勘探的深入，前期的油气来源研究成果已不能满足精细勘探研究的需求。基于原油/油砂和烃源岩样品的测试分析资料，将巴音戈壁组细分为3个层段（自下而上分别为巴一段、巴二段和巴三段）后开展精细油源分析，并对主力供烃源岩进行分布预测和生烃特征评价，以期明确油气来源和主力供烃源岩特征。研究结果表明：碳同位素对研究区油源有很好的指示作用，哈日凹陷主力产油层段巴一段和巴二段的原油分别主要来自于巴一段和巴二段烃源岩，无环链烷烃、甾烷、萜烷、芳烃等生物标志化合物也指示出同样的油源结论，特别是芳烃化合物在本次研究中取得了很好的应用效果。巴一段有效烃源岩最大厚度为151 m，巴二段有效烃源岩最大厚度为222 m，2套主力供烃源岩在研究区均有较大厚度的有效烃源岩分布。巴一段烃源岩TOC平均为0.89%，干酪根δ¹³C为-29.1‰~-24.5‰，R_o为0.60%~2.01%，烃源岩为有机质丰度中等-好、Ⅱ₁型-Ⅱ₂型、成熟-高成熟的烃源岩。巴二段烃源岩TOC平均为1.18%，干酪根δ¹³C为-30.3‰~-23.8‰，R_o为0.60%~2.17%，烃源岩为有机质丰度好-极好、Ⅱ₁型-Ⅱ₂型、成熟-高成熟的烃源岩，2套主力供烃源岩有机质丰度较高，且基本处于生油气高峰期热演化阶段，有很好的生烃潜力，能为油气成藏提供良好的烃类基础。

关键词: 生物标志化合物, 油源对比, 主力供烃源岩, 展布特征, 生烃特征, 巴音戈壁组, 哈日凹陷, 银额盆地

Abstract: In recent years, some achievements have been made in oil & gas exploration in Hari sag, Yingen-Ejinaqi basin, but the exploration here is very difficult due to its complex geological conditions.Especially, with the deepening of exploration, previous research results of oil & gas sources can not meet the needs of fine exploration research.Based on the test and analysis data of crude oil, oil sand and source rock samples, Bayingebi Formation is subdivided into three segments(K₁b¹, K₁b² and K₁b³ from bottom to top), then the fine oil source analysis is carried out, and the distribution prediction and characteristics evaluation of the main source rocks are carried out in order to clarify the source of oil and the characteristics of the main source rocks.The results show that carbon isotopes have a good indication for oil sources in the study area, the crude oil in main oil-producing segments of K₁b¹ and K₁b² mainly comes from K₁b¹ and K₁b² source rocks, respectively.Biomarkers such as acyclic alkanes, steroids, terpenes and aromatics also indicate the same conclusion.In particular, aromatic compounds have achieved good application results in this study.The maximum thickness of effective source rocks in K₁b¹ is 151 m, and K₁b² is 222 m, the two sets of main source rocks both with a large thickness in the study area.As for geochemistry characteristic of source rock in K₁b¹, TOC averages at 0.89%, δ¹³C of kerogen ranges from -29.1‰ to -24.5‰, R_o from 0.60% to 2.01%, the source rocks are characterized by medium-good organic mater abundance, Type Ⅱ₁-Ⅱ₂ and maturity-high maturity.For source rocks in K₁b², TOC averages at 1.18%, δ¹³C of kerogen ranges from -30.3‰ to -23.8‰, R_o from 0.60% to 2.17%, the source rocks are good-excellent organic mater abundance, Type Ⅱ₁-Ⅱ₂ and maturity-high maturity source rock.With high abundance of organic matter, and in the thermal evolution stage of the peak period of hydrocarbon generation, the two sets of main source rock both have a good hydrocarbon generation potential, and can provide a good hydrocarbon basis for oil & gas accumulation.

Key words: biomarker, oil-source correlation, main source rock for hydrocarbon supply, distribution characteristics, hydrocarbon generation characteristics, Bayingebi Formation, Hari sag, Yingen-Ejinaqi basin

中图分类号:

TE112.1

陈治军,马芳侠,肖刚,等. 银额盆地哈日凹陷巴音戈壁组精细油源对比[J]. 石油与天然气地质, 2019, 40(4): 900-916. doi: 10.11743/ogg20190418 Chen Zhijun,Ma Fangxia,Xiao Gang,et al. Oil-sources rock correlation of Bayingebi Formation in Hari sag, Yingen-Ejinaqi Basin[J]. Oil & Gas Geology, 2019, 40(4): 900-916. doi: 10.11743/ogg20190418

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