Abstract：The characteristics of the marine carbonate source rocks and the accumulation and potential of self-sourced natural gas in the Ordovician Majiagou Formation of the Ordos Basin are investigated based on recent exploration progress by using geochemical and gas-source correlation methods. Massive source rocks are developed around the salt depression, east of the paleo-uplift in the Ordovician Majiagou Formation during the Caledonian; and the natural gases produced by argillaceous dolomite and dolomitic mudstone are the major sources of the Ordovician gas field. Besides widespread carbonate weathering crust karst, internal grainstone dolomite is also well-developed in the Majiagou Formation, and both can act as favorable reservoirs. The natural gas of the Majiagou Formation is mainly self-sourced oil-type gas generated by in-situ source rock and accumulated near the source area. There is only limited local accumulation of natural gas produced in the upper strata and stored below. The Majiagou Formation around the salt depression has favorable conditions for large scale natural gas generation and accumulation, has the advantage of collecting large area natural gas of self-generation and self-preservation and the frontier depression areas of the paleo-uplift to the west, north and south of Jingbian gas field are the potential Ordovician exploration targets in the future.
李伟, 涂建琪, 张静, 张斌. 鄂尔多斯盆地奥陶系马家沟组自源型天然气聚集与潜力分析[J]. 石油勘探与开发, 2017, 44(4): 521-530.
LI Wei, TU Jianqi, ZHANG Jing, ZHANG Bin. Accumulation and potential analysis of self-sourced natural gas in the Ordovician Majiagou Formation of Ordos Basin, NW China. Petroleum Exploration and Development, 2017, 44(4): 521-530.
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