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| 准噶尔盆地四棵树凹陷烃源岩地球化学特征及其对车排子凸起油气聚集的贡献 | |
| 引用本文： | 张枝焕 向 奎 秦黎明,庄文山 席伟军,赵双丰.准噶尔盆地四棵树凹陷烃源岩地球化学特征及其对车排子凸起油气聚集的贡献[J].中国地质,2012,39(2):326-337. |
| 作者姓名： | 张枝焕 向 奎 秦黎明 庄文山 席伟军 赵双丰 |
| 作者单位： | 1. 中国石油大学(北京)油气资源与探测国家重点实验室,北京,102249 2. 中国石化胜利油田有限责任公司新疆勘探开发中心,山东东营,257000 3. 中国石油大学(北京)油气资源与探测国家重点实验室,北京102249;中国石化石油工程技术研究院,北京100101 4. 中国石油大学(北京)油气资源与探测国家重点实验室,北京102249;中国石化胜利油田有限责任公司新疆勘探开发中心,山东东营257000 |
| 基金项目： | 国家科技重大专项“准噶尔盆地及四川盆地碎屑岩领域油气富集规律与主控因素”(2011ZX05002-006)资助 |
| 摘 要： | 准噶尔盆地西南缘四棵树凹陷主要分布侏罗系、白垩系和古近系3套潜在烃源岩,其中侏罗系八道湾组烃源岩有机质丰度较高,有机质类型以Ⅲ型为主,部分为Ⅱ2型,生烃潜力较高;三工河组烃源岩有机质丰度、类型明显偏差,生烃潜力较低;西山窑组泥岩有机质丰度较高,但由于受西山窑组沉积末期构造抬升导致地层剥蚀的影响,烃源岩厚度较小,总体上生烃条件较差;白垩系烃源岩在四棵树凹陷最大厚度可达300 m,处于低熟阶段,生烃潜力较小;古近系烃源岩有机质丰度较高、类型好,但成熟度偏低,生烃条件较差。侏罗系八道湾组烃源岩处于主要生油阶段;白垩系烃源岩已达到生烃门限,处于低熟—中等成熟阶段;古近系烃源岩成熟度偏低,目前仍处于未熟到低熟阶段。油源对比表明,四棵树凹陷北部斜坡及车排子凸起带原油主要来源于四棵树凹陷及沙湾凹陷侏罗系烃源灶,后期受到白垩系低熟油源灶的侵染,古近系烃源岩的油源贡献有限。 |
| 关 键 词： | 四棵树凹陷 烃源岩 地球化学特征 油源对比 侵染作用 |
Geochemical characteristics of source rocks and their contribution to petroleum accumulation of Chepaizi area in Sikeshu depression, Junggar Basin |
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| ZHANG Zhi-huan,XIANG Kui,QING Li-ming,ZHUANG Wen-shan,XI Wei-jun,ZHAO Shuang-feng.Geochemical characteristics of source rocks and their contribution to petroleum accumulation of Chepaizi area in Sikeshu depression, Junggar Basin[J].Chinese Geology,2012,39(2):326-337. | |
| Authors: | ZHANG Zhi-huan XIANG Kui QING Li-ming ZHUANG Wen-shan XI Wei-jun ZHAO Shuang-feng |
| Institution: | 1 (1.State Key Laboratory of Petroleum Source and Prospecting,China University of Petroleum,Beijing,102249,China; 2.Xinjiang Exploration and Development Center of Shengli Oilfield Branch Co.,Ltd.,Dongying 257017 Shangdong,China;3.Research Institute of Petroleum Engineering,SINOPEC,Beijing 100101,China) |
| Abstract: | According to geochemical characteristics in combination with thermal evolution,there exist mainly three sets of source rocks in Sikeshu depression of Junggar basin,namely Jurassic(Badaowan Formation,Sangonghe Formation and Xishanyao Formation),Cretaceous and Paleogene.The Badaowan Formation source rocks which contain high abundance of organic matter of primarily Ⅲ and Ⅱ 2 type have fairly good hydrocarbon-generation potential.The Sangonghe Formation source rocks have poor condition of hydrocarbon generation in that they have low abundance of organic matter and inferior type of kerogen.The organic matter abundance in source rocks of Xishanyao Formation is relatively high,but its hydrocarbon-generation potential is not ideal owing to relatively small thickness and poorer type of organic matter.The Cretaceous source rocks in Sikeshu depression have maximum thickness of 300m,but the condition of hydrocarbon generation is not favarable due to the lower maturity.Paleogene source rocks with high abundance of organic matter and Type Ⅱ organic matter have poor hydrocarbon-generation potential because of lower maturity.Through oil-source rocks correlation and quantitative identification of mixed oil,it is concluded that the crude oil in Chepaizi area was mainly derived from the Jurassic source rock in Sikeshu depression and mixed with the immature crude oil from the Cretaceous source,but the hydrocarbon generation of the Paleogene source rock is very little due to no distribution of the source kitchen.It is inferred that coal-formed oil dissolved the biomarker-rich Cretaceous bitumen of relatively low thermal maturity,and overprinting occurred during oil migration. |
| Keywords: | Sikeshu depression source rock geochemical characteristics oil-source correlation overprinting |
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