鄂尔多斯盆地中生界延长组长7 段页岩油地质特征及勘探开发进展

doi:10.3969/j.issn.1672-7703.2019.05.007

摘要/Abstract

摘要： 鄂尔多斯盆地中生界三叠系延长组长7 段发育丰富的非常规石油资源，目前对于其属于致密油还是页岩油尚存在争议。结合国内外现状及其地质特征，文章将其统称为页岩油，即鄂尔多斯盆地延长组长7 段页岩油指长7 段烃源岩层系内致密砂岩和泥页岩中未经过长距离运移而形成的石油聚集，并根据岩性组合等因素将其分为多期叠置砂岩发育型（Ⅰ类）、页岩夹薄层砂岩型（Ⅱ类）和纯页岩型（Ⅲ类）共3 种类型。综合地质研究认为，长7 段页岩油具有砂泥储层大面积分布、储层致密但流体可动性较好、含油饱和度高、油质轻、气油比较高、埋藏较浅、资源量大等特点。近年来通过地震、测井、工程及开发技术攻关，推动长7 段页岩油勘探开发取得良好成效：落实了I 类页岩油整装规模储量区，建成3 个Ⅰ类页岩油水平井攻关试验区；Ⅱ、Ⅲ类页岩油直井勘探突破出油关；Ⅰ类页岩油规模开发成效显著，长7 段页岩油已成为长庆油田“二次加快”发展的重要资源保障。

关键词: 页岩油, 鄂尔多斯盆地, 中生界, 长7 段, 勘探开发进展

Abstract: Rich unconventional petroleum resources are developed in the Chang 7 Member of the Mesozoic Triassic Yanchang Formation in the Ordos Basin. At present, there are still disputes on whether it is tight oil or shale oil. According to the current situation at home and abroad, and its geological characteristics, we call it shale oil in this paper, i.e. the Chang 7 Member of Yanchang Formation in the Ordos Basin shale oil refers to the oil accumulation in tight sandstone and shale in the Chang 7 Member source rocks, which was formed without a long-distance migration. Depending on lithologic association and other factors, the shale oil reservoirs are classified into 3 types as multiphase sand overlay type (type I), shale interbedded with thin sandstone type (type II) and pure shale (type III). According to the comprehensive geological study, Chang 7 shale oil is characterized by the following: sand-mud reservoir with large area distribution, dense reservoir with good fluidity, high oil saturation, light oil, high gas-oil ratio, shallow burial, and large quantity of resources, etc. In recent years, through seismic survey, well logging, research on engineering and development technologies, achievements on exploration and development of shale oil in Chang 7 Member are achieved, such as: defined the scale reservoir area of type I shale oil, and 3 pilot areas for horizontal well development of type I shale oil were constructed; for type II and type III shale oil, production of oil was achieved through vertical well exploration; the scale development of type I shale oil has achieved remarkable results, and shale oil of Chang 7 Member has become an important resource guarantee for the "second acceleration" development of Changqing oilfield.

中图分类号:

付金华, 牛小兵, 淡卫东, 冯胜斌, 梁晓伟, 辛红刚, 尤源. 鄂尔多斯盆地中生界延长组长7 段页岩油地质特征及勘探开发进展[J]. 中国石油勘探, 2019, 24(5): 601-614.

Fu Jinhua, Niu Xiaobing, Dan Weidong, Feng Shengbin, Liang Xiaowei, Xin Honggang, You Yuan. The geological characteristics and the progress on exploration and development of shale oil in Chang7 Member of Mesozoic Yanchang Formation, Ordos Basin[J]. China Petroleum Exploration, 2019, 24(5): 601-614.

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