Breakthrough and significance of natural gas exploration in the fourth member of Majiagou Formation of subsalt Ordovician in Ordos Basin

doi:10.3969/j.issn.1672-7703.2022.02.005

Abstract

Abstract: The carbonate-evaporite paragenetic deposits are developed in the Ordovician Majiagou Formation in Ordos Basin. The fourth member of Majiagou Formation (Ma 4 member) is composed of a set of transgressive carbonate rocks with the largest thickness in Majiagou Formation, which has always been the target layer for natural gas exploration. Based on geophysical, drilling, core samples and organic geochemical data, the hydrocarbon accumulation conditions such as paleo structure, reservoir distribution, source rocks and trap are restudied, and the following achievements are obtained: (1) Natural gas in Ma 4 member is oil-type gas, generated by marine source rock of the subsalt Ordovician. In addition to conventional kerogen, the source rock has a large amount of parent materials for hydrocarbon generation, such as the dispersed organic matter and organic acid salt, showing great potential of hydrocarbon generation; (2) In the Ordovician, two secondary structural units, Wushenqi-Jingbian paleo uplift and the eastern subsalt low uplift, were developed in central-eastern depression in Ordos Basin, which controlled the development of dolomite reservoir in the intra-platform shoal and intra-platform mound of Ma 4 member, with the main reservoir space of intergranular pores; (3) The wide spread self-generation and self-storage type lithologic gas reservoir is formed in the central-eastern Ordos Basin by marine source rocks of subsalt Ordovician, reservoir of the intra-platform shoal and intra-platform mound dolomite of Ma 4 member, and cap rocks of the overlying thick evaporites and the lateral barrier provided by tight limestone in the updip direction. Guided by the new geological understanding, the risk exploration Well MT1 was drilled targeting at Ma 4 member, in which a gas layer of 43.4 m was penetrated, and high gas flow of 35.24×104 m3/d was tested by applying new hydraulic sand fracturing technology, achieving a major breakthrough in strategic replacement field in the basin.

CLC Number:

TE122.1

Fu Jinhua, Liu Xinshe, Wei Liubin, Ren Junfeng, Gu Yonghong, Wang Qianping, Shi Pingping. Breakthrough and significance of natural gas exploration in the fourth member of Majiagou Formation of subsalt Ordovician in Ordos Basin[J]. China Petroleum Exploration, 2022, 27(2): 47-58.

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