天然气地球科学 ›› 2020, Vol. 31 ›› Issue (9): 12941305.doi: 10.11764/j.issn.1672-1926.2020.05.008
牛强1(),张焕旭2,3(),朱地4,徐志尧2,3,仰云峰2,3,丁安徐5,高和群5,张立生1
Qiang NIU1(),Huan-xu ZHANG2,3(),Di ZHU4,Zhi-yao XU2,3,Yun-feng YANG2,3,An-xu DING5,He-qun GAO5,Li-sheng ZHANG1
摘要:
为了更详尽地分析不同深度段五峰组—龙马溪组页岩气的碳同位素特征以及页岩气的成藏富集规律,选取川东南地区3口典型页岩气评价井开展了页岩气碳同位素录井工作。在钻探现场连续取样并检测泥浆气的碳同位素值,并以DY5井为例检测了岩屑释气过程中的碳同位素变化。基于碳同位素录井数据,综合分析了五峰组—龙马溪组页岩气的碳同位素平面分布及纵向变化特征、碳同位素倒转特征和岩屑释气过程中的碳同位素分馏特征。综合分析认为:四川盆地五峰组—龙马溪组页岩气碳同位素值由盆地周缘向中心逐渐变轻,这一变化规律主要受控于页岩的热演化程度;川东南3口井的泥浆气碳同位素的纵向变化及倒转特征具有一定共性,表明其具有相近的页岩气富集规律;DY5井的岩屑罐顶气越靠近地质甜点区域同位素分馏越明显且岩屑释气量越大,反映该段页岩气具有初始地层压力高、含气量大、纳米孔隙更发育等特征。
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