鄂尔多斯盆地致密油勘探开发新进展及规模富集可开发主控因素

摘要/Abstract

摘要： 鄂尔多斯盆地延长组长7 油层组中与烃源岩互层或紧邻的致密砂岩储层地面空气渗透率小于0.3mD，赋存于该致密砂岩储层中的石油资源是典型的致密油。截至2014 年，探明了中国第一个亿吨级大型致密油田——新安边油田，建成了3 个致密油藏水平井技术示范区和3 个规模开发试验区。研究认为，优质烃源岩广覆式分布、细粒级砂体大面积展布、储层2～8μm 的小孔隙极发育、充注成藏动力强等有利的成藏条件及四者间的有效组合是形成鄂尔多斯盆地致密油规模富集的关键；长7 致密砂岩储层工程品质好、原油油质好且溶解气含量高、油层中性—弱亲水润湿性，有利于致密油的采出；盆地致密油勘探潜力巨大，初步评价长7 致密油资源量达20×10⁸t，是油田可持续稳产的重要资源保障。

关键词: 鄂尔多斯盆地；长7 油层组；致密油；勘探开发关键技术；规模富集；可开发；主控因素

Abstract: In the Chang-7 member of YanChang Formation in Ordos Basin, the tight sandstone reservoir is inter-bedded with or adjacent to source rock. Its surface air permeability is less than 0.3mD and the oil reserve in the tight sand reservoir is typically tight oil. As of 2014, China^’s first large-scale tight oil field with the reserve reaching 100 million tons – Xin^’anbian Oilfield – has been proven, with three demonstration zones of tight oil horizontal well technology and three pilot zones for large-scale development established. The study indicates a series of favorable conditions for accumulations, such as a wide distribution of high-quality source rock, large-area extension of fine-grained sand body, development of small-size pore with a diameter of 2-8μm, and filling ability for accumulation. Effective combination of those favorable conditions holds the key to large-scale enrichment of tight oil in Ordos Basin. The Chang 7 tight sandstone reservoir is good for engineering quality and crude oil quality and high in dissolved gas content, with a neutral-weak hydrophilic wettability of oil reservoir, thus being in favor of crude oil production. The basin has a great potential for tight oil exploration. Based on a preliminary assessment, tight oil reserve is as high as 20×10⁸t, providing the important resources for the oil field to keep its production stable.

Key words: Ordos Basin, Chang 7 Member, tight oil, key exploration and development technology, large-scale enrichment, exploitable, controlling factors

付金华　喻　建　徐黎明　牛小兵　冯胜斌　王秀娟　尤　源　李　涛. 鄂尔多斯盆地致密油勘探开发新进展及规模富集可开发主控因素[J]. 中国石油勘探, 2015, 20(5): 9-19.

Fu Jinhua, Yu Jian, Xu Liming, Niu Xiaobing, Feng Shengbin, Wang Xiujuan, You Yuan, Li Tao. New Progress in Exploration and Development of Tight Oil in Ordos Basin and Main Controlling Factors of Largescale Enrichment and Exploitable Capacity[J]. China Petroleum Exploration, 2015, 20(5): 9-19.

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