鄂尔多斯盆地上古生界准连续型气藏气源条件

doi:10.11743/ogg20130502

Abstract

Abstract:

A comprehensive analysis of the Upper Paleozoic gas source conditions in Ordos Basin shows that high quality source rock is the major factor controlling the formation and distribution of large tight sandstone gas field in the study area.The lower limit of gas generation intensity for large tight sandstone gas field is determined based on analysis of gas production test results.A correlation analysis is first performed on the thickness,total organic carbon content (TOC) and maturity of the Upper Paleozoic source rocks in Ordos Basin,and gas generation intensity of the sources rocks is then calculated based on the correlation analysis.The calculation results are finally integrated with gas production tests to perform comprehensive analysis.The analysis of gas source conditions indicates that the Upper Paleozoic source rocks are characterized by high quality,wide distribution,high maturity,high intensity of gas generation and wide gas supply.In general,the intensity of gas generation ranges from 10×10⁸ m³/km² to 40×10⁸ m³/km².However,the gas generation intensity is not equilibrium in the whole basin.It ranges from 10×10⁸ m³/km² to 20×10⁸ m³/km² in the western basin,whereas,it is more than 16×10⁸ m³/km²in most part of eastern basin.In conclusion,high quality source rock is one of the major factors controlling the formation of large tight sandstone gas field,and it also controls the distribution of gas-water contact in the Upper Paleozoic tight sand reservoirs.As gas accumulation is closed to the source rocks and the accumulation efficiency is high,the lower limit of gas-generation intensity can be reduced to about 10×10⁸ m³/km² for Upper Paleozoic quasi-continuous tight gas accumulation in Ordos Basin.

Key words: gas source condition, gas generation intensity, tight sandstone, Upper Paleozoic, Ordos Basin

CLC Number:

TE122.1

Cao Qing, Zhao Jingzhou, Fu Jinhua, Yao Jingli, Liu Xinshe, Zhao Huitao, Hou Yundong, Fan Liyong. Gas source conditions of quasi-continuous accumulation of the Upper Paleozoic in Ordos Basin[J]. Oil & Gas Geology, 2013, 34(5): 584-591.

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Gas source conditions of quasi-continuous accumulation of the Upper Paleozoic in Ordos Basin

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