New Progress in Exploration and Development of Tight Oil in Ordos Basin and Main Controlling Factors of Largescale
Enrichment and Exploitable Capacity

Abstract

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

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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New Progress in Exploration and Development of Tight Oil in Ordos Basin and Main Controlling Factors of Largescale Enrichment and Exploitable Capacity

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