鄂尔多斯盆地陇东地区上古生界天然气富集规律

doi:10.11743/ogg20160205

Abstract

Abstract: Based on the analysis of source rocks, reservoirs and cap rocks in the Upper Paleozoic, Longdong eara, Ordos Basin, studies were performed on the controlling factors of natural gas accumulation.It's shown that the formation and distribution of gas reservoirs in the Upper Paleozoic are mainly controlled by the source rocks, reservoirs and cap rocks and the coupling relationship among them.Source rocks and cap rocks of the Shanxi Formation jointly control the formation and distribution of the gas reservior in the region.The gas play fairway of the first member of Shanxi Formation(P₂s¹) are distributed in area with high gas generation intensity and thick P₂s¹ cap rock over 35 meters.In contrast, gas play fairway of the eighth member of Shihezi Formation(P₂h⁸) occurs in area where the thickness of P₂s¹ cap rock is less than 35 meters.Local enrichment of gas is dermermined by the reservior conditions.When the source rocks and cap rocks of the first member of the Shanxi Formation are similiar, "sweet spot" controls gas distribution, that is to say the better the quality of the reservoir is, the more enrichment the natural gas is.When both the source rocks and cap rocks of the first member of Shanxi Formation are favorable, gas reservoir can also be formed in the relatively poor formations.It is worth noting that best gas enrichment area is not the one where the gas source, seal and reservoir conditions are all favorable, rather the one where the gas source, seal and reservoir conditions match and compensate best.

Key words: coupling of three-factor controlling gas accumulation, natural gas enrichment pattern, tight sand gas, Longdong area, Ordos Basin

CLC Number:

TE122.1

Li Jun, Wang Yunuo, Zhao Jingzhou, Li Lei, Zheng Jie, Hu Weiqiang. Accumulation patterns of natural gas in the Upper Paleozoic in Longdong area, Ordos Basin[J]. Oil & Gas Geology, 2016, 37(2): 180-188.

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Accumulation patterns of natural gas in the Upper Paleozoic in Longdong area, Ordos Basin

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