“准连续型”致密砂岩油藏地质特征及成藏主控因素分析：以鄂尔多斯盆地陇东地区长7油层组为例  

Geological features and main controlling factors of “Quasi-continuous” tight sandstone reservoir: a case study of Chang 7 formation in Longdong area, Ordos Basin

作　　者：李得路[1] 李荣西[1] 赵卫卫[2] 田浩年 张磊 王宝萍 吴小力[1] 赵帮胜 程敬华[1] 

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]西安石油大学地球科学与工程学院,西安710065 [3]中石油煤层气有限责任公司临汾分公司,山西临汾042200 [4]陕西延长石油(集团)有限责任公司,陕西延安716000

出　　处：《兰州大学学报（自然科学版）》2017年第2期163-171,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(41173055)

摘　　要：基于大量钻井、测井、录井、试油及研究资料,结合岩心观察、薄片鉴定及物性分析等多项数据,运用最新非常规油气地质理论,通过综合研究陇东地区长7油层组储层特征、油藏形成条件和主控因素,认为陇东地区长7油藏属于"准连续型"致密砂岩油藏,受岩性特征、储层物性特征、沉积相特征和运移动力等因素影响,石油经短距离运移近源成藏.其长7致密砂岩油藏具有平面上呈条带状准连续分布、分布规模较大、储层致密、孔喉结构复杂等特征.下部泥页岩有机质丰度高、有机质类型好、厚度大,具有很强的生烃潜力,为该区优质的烃源岩,与大面积分布的厚层储集砂体垂向上叠置互层,对油藏的分布具有主要控制作用.陇东地区致密油资源潜力巨大,勘探前景很广阔.Based on large quantities of drilling, well logging, geological logs, oil production testing and previous research data combined with core observation, thin section identification, physical analysis and multinomial data, and using the latest unconventional geological theory throughout a comprehensive study on reservoir layer characteristics, reservoir forming conditions and main controlling factors of Chang 7 formation in Longdong area, the Chang 7 oil reservoir was defined as a ＂quasi-continuous＂ tight sandstone reservoir and influenced by lithologic characteristics, reservoir physical properties, sedimenta- ry phase characteristics and migration dynamic force, with the oil having migrated by short distances and gathered into a reservoir. Chang 7 tight sandstone reservoirs in Longdong are claaracterlzecl Dy quasi-con- tinuous and large scale distribution, densification of the reservoir and a complex pore-throat structure. The underpart shale possesses high organic abundance, good organic matter type and huge thickness and has a strong potential of hydrocarbon generation, making the place a high-quality hydrocarbon source rock overlaid with a large area of thick sandstone, which has a major influence on the distribution of the reservoir. Therefore this tight oil reservoir is of the broad potentials and good exploration prospects.

关 键 词：准连续型 致密砂岩油藏 主控因素 长7油层组 陇东地区 

分 类 号：TE121[石油与天然气工程—油气勘探]