Characteristics of natural gas accumulation and exploration target of the Ordovician subsalt in the central and eastern Ordos Basin

doi:10.3969/j.issn.1672-7703.2021.06.009

Abstract

Abstract: The large-scale salt and gypsum rocks are deposited of the Ordovician Majiagou Formation in central and eastern Ordos Basin, with great thickness and superior sealing capacity. The underlying carbonates have always been a major field for natural gas exploration. Based on the analysis of regional tectonic sedimentary settings and sedimentary facies distribution, the characteristics of carbonate reservoir and gas accumulation of the target layer - the 4th member of Majiagou Formation (Ma 4 member) are studied, which is underlaid by subsalt caprock of the 5th member of Majiagou Formation (Ma 5 member). The results show that, controlled by the intra-platform sedimentary differentiation in the paleo uplift, the intercrystal pore type dolomite reservoir of beach facies is developed of Ma 4 member. In addition, the dissolution pore type dolomite reservoir of the 3rd member of Majiagou Formation (Ma 3 member) also has good reservoir performance. The weathering and denudation during the Caledonian resulted in a good spatial configuration between the dolomite reservoir of Ma 4 member and the source rocks of coal series in the Upper Paleozoic and marine source rocks of the Ordovician subsalt. Therefore, the gas reservoir has the characteristics of dual-source hydrocarbon supply and lithologic gas reservoir controlled by lithologic facies change. The detailed analysis of source rock – reservoir – caprock assemblages and the comparison of controlling factors for gas accumulation in different regions indicate that the salt diapir uplift zone of Ma 4 member of the Ordovician subsalt in the eastern basin and the lithologic facies change zone controlled by Wushenqi paleo uplift in the central basin are favorable targets for gas exploration. In addition,Ma 3 member and the 2nd member of Majiagou Formation (Ma 2 member) in deep formation also have promising prospects.

CLC Number:

TE112.3

Ren Junfeng, Liu Xinshe, Yu Jian, Wei Liubin, Wang Qianping. Characteristics of natural gas accumulation and exploration target of the Ordovician subsalt in the central and eastern Ordos Basin[J]. China Petroleum Exploration, 2021, 26(6): 125-140.

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