煤成气干燥系数影响因素探讨——以鄂尔多斯盆地北部上古生界为例

doi:10.11743/ogg20170610

摘要/Abstract

摘要： 干燥系数广泛应用于煤成气（天然气）地球化学特征及成因、成藏研究，而对于煤成气干燥系数影响因素的专题研究较少。通过对鄂尔多斯盆地北部东胜（杭锦旗）、大牛地、苏里格气田上古生界煤成气化学组分的测试及资料收集，分析了该区煤成气干燥系数的纵、横向分布特征，建立了“二段式”纵向分布模式，并结合区域地质背景，探讨了控制其分布的主要地质因素。研究表明：①该区上古生界煤成气干燥系数呈自盆地中心向边缘减小的平面分布特征和自下而上先减小再增大的“二段式”纵向分布特征；②煤成气干燥系数受到成熟度、地质色层作用和逸散作用等影响；③干燥系数的宏观区域分布主要受控于气源岩成熟度作用。纵向上，影响干燥系数“二段式”分布的主控因素不同，下部烃源层内为成熟度作用，而上部储集层内则是地质色层作用。局部保存条件欠佳地区干燥系数还受到逸散作用影响而减小。

关键词: 干燥系数, 成熟度, 地质色层作用, 逸散作用, 煤成气, 上古生界, 鄂尔多斯盆地

Abstract: The dryness coefficient is widely used in the studies on the geochemical characteristics,genetic types and accumulation of coal-derived gas,but only a few of them have addressed the factors affecting the dryness coefficient of coal-derived gas.The major coal-derived gas fields of the Upper Paleozoic reservoir in northern Ordos Basin,such as Dongsheng (Hangjinqi),Daniudi and Sulige,are chosen.Based on the measured and collected data of chemical components,lateral and vertical distribution characteristics of dryness coefficient of coal-derived gas are analyzed,and a two-stage vertical distribution pattern is established.The main controlling geological factors are discussed within the context of regional geological background.The results indicate that ① the dryness coefficient of the Upper Paleozoic coal-derived gas decreases from the center to the margin of the basin,and it displays a two-stage vertical distribution pattern in which the dryness coefficient firstly increases and then decreases from bottom to top.② The dryness coefficient of coal-derived gas is influenced by maturity,geochromatograph effect and leakage effect.③ The maturity of the Upper Paleozoic source rocks determines the regional distribution characteristics of the dryness coefficient.The main controlling factors affecting the "two-stage" vertical distribution of the dryness coefficient are different in the different depth.The source layer and geochromatograph effect the lower and upper reservoirs,respectively.The dryness coefficient is also affected by leakage effect in the areas with poor preservation conditions.

Key words: dryness coefficient, maturity, geochromatograph effect, leakage effect, coal-derived gas, Upper Paleozoic, Ordos Basin

中图分类号:

TE122.1

倪春华,包建平,刘光祥,等. 煤成气干燥系数影响因素探讨——以鄂尔多斯盆地北部上古生界为例[J]. 石油与天然气地质, 2017, 38(6): 1098-1104,1216. doi: 10.11743/ogg20170610 Ni Chunhua,Bao Jianping,Liu Guangxiang,et al. A discussion on the influence factors of dryness coefficient of coal-derived gas: A case from the Upper Paleozoic reservoir in northern Ordos Basin[J]. Oil & Gas Geology, 2017, 38(6): 1098-1104,1216. doi: 10.11743/ogg20170610

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