摘要
鄂尔多斯盆地富县地区长7沉积期湖盆中心页岩厚度大,储层非均质性强。为明确富县地区张家滩页岩岩相类型、地质特征及其油气地质意义,利用岩心观察、全岩矿物X射线衍射分析、氯仿抽提、核磁共振、有机碳及孔隙度测试等多种手段,开展页岩层系岩相类型识别及划分,研究不同岩相地质特征、最有利岩相及油气地质意义。结果表明:富县地区张家滩页岩岩相类型主要为黑色页岩岩相、灰黑色泥页岩岩相、纹层状黑色页岩岩相、纹层状灰黑色泥页岩岩相、粉砂岩相、凝灰岩相等6种岩石相类型;不同岩相的岩石矿物组分、孔隙度、有机地球化学特征等均不同,粉砂岩相和纹层状黑色页岩的可动性指数明显高于其他岩相;页岩油赋存的最有利岩相为粉砂岩相和含粉砂质纹层黑色页岩岩相;张家滩页岩中细砂岩、粉砂岩为未来有利目标。研究结果为富县地区乃至整个鄂尔多斯盆地张家滩页岩的研究与勘探提供实践价值和理论意义。
In Fuxian area of Ordos basin,the shale in the center of Chang 7 sedimentary period is thick and the reservoir heterogeneity is strong.In order to clarify the lithofacies types,geological characteristics and oil and gas geological significance of Zhangjiatan shale in Fuxian area,the identification and division of shale series lithofacies types were made by means of core observation,whole rock mineral X-ray diffraction analysis,chloroform extraction,nuclear magnetic resonance,organic carbon and porosity testing.And the geological characteristics of different lithofacies,the most favorable lithofacies and oil and gas geological significance were examined.The results show that the lithofacies of Zhangjiatan shale in Fuxian area can be divided into six lithofacies types:black shale facies,gray black shale facies,lamellar black shale facies,lamellar gray black shale facies,silty sandstone facies and tuff facies.The rock mineral composition,porosity and organic earth characteristics of different lithofacies are different.The mobility index of silty lithofacies and laminated black shale is significantly higher than that of other lithofacies.The most favorable lithofacies for shale oil occurrence are siltstone facies and black shale lithofacies with silty laminae.The sandstone and siltstone in Zhangjiatan shale are favorable targets in the future.The research results provide practical value and theoretical significance for the research and exploration of Zhangjiatan shale in Fuxian area and even the whole Ordos Basin.
作者
林进
孙建博
罗腾跃
LIN Jin;SUN Jianbo;LUO Tengyue(Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 716065,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 710065,China)
出处
《西安科技大学学报》
CAS
北大核心
2022年第6期1122-1132,共11页
Journal of Xi’an University of Science and Technology
基金
国家科技重大专项项目(2017ZX05039)
陕西延长石油(集团)有限责任公司项目(ycsy2022jcts-B-28)。
关键词
富县地区
张家滩页岩
地化特征
油气地质意义
Fuxian area
Zhangjiatan shale
characteristics of geochemistry
petroleum geological significance
