C、O同位素在川东北碳酸盐岩储层研究中的应用
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2011-04-10
摘要: 通过对川东北鸡唱地区碳酸盐岩的C、O同位素分析，结合岩石薄片镜下研究和阴极发光分析及前人的研究成果，探讨飞仙关组三级海平面变化趋势和白云岩化作用机理。为了便于分析，将样品分为泥晶灰岩和白云岩两组。泥晶灰岩的C、O同位素分析结果表明：δ13C全为正值，明显分为两段，先快速上升、然后低辐振荡下降，指示海平面在飞一段初期快速上升、达到最大海泛面后，呈振荡、缓慢下降的趋势；δ13C演化曲线整体呈上升趋势，与三叠纪全球海平面上升的背景相吻合；δ18O对海平面升降的指示意义不明显，可能是由于后期成岩作用对原始δ18O的改造所致。白云岩C、O同位素分析结果表明：δ13C(0.91‰~2.09‰)、δ18O(-3.45‰~-9.29‰)的正交投点落在第二象限，结合薄片镜下研究和阴极发光分析，认为研究区白云岩成因为埋藏白云岩化。
Application of Carbon and Oxygen Isotope to Carbonate Reservoirs in Northeast Sichuan Basin
- China University of Geosciences, Wuhan 430074
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2011-04-10
Abstract: The trend of thirdorder sealevel changes and mechanism of dolomitization are studied, based on C, O isotope analysis of carbonate rocks, as well as microscopic research, CL analysis, and previous studies of Feixianguan Formation in Jichang of northeast Sichuan Basin. In convenience to analysis, the samples were grouped into two sets of micrite limestone and dolomite. The C, O isotope analysis of micrite limestone shows that the value of δ13C are all positive, and two stages are clear, that is, the first stage is a fast rising stage and followed a fallingstage with a wave shape. The result suggests that the sea level increases quickly in the early First Section of Feixianguan Formation, then, shows a slowly falling trend with sublevel fluctuation after maximum flooding surface. The δ13C evolution curve is rising totally, which is in accord with the rising trend of the Triassic global sea level. The implications of δ18O on the sealevel changes is obscure, due to the processes of late diagenesis. The C, O isotope analysis of dolomite shows that the orthogonal points of δ13C (0.91‰~2.09‰) and δ18O (3.45‰~9.29‰) fall in the second quadrant. The result, combining with microscope studies and cathodeluminescent analysis, suggests that dolomitization was formed in the buried condition.
陈 梅. C、O同位素在川东北碳酸盐岩储层研究中的应用[J]. 沉积学报, 2011, 29(2): 217-225.
| 引用本文: |
陈 梅. C、O同位素在川东北碳酸盐岩储层研究中的应用[J]. 沉积学报, 2011, 29(2): 217-225.
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CHEN Mei. Application of Carbon and Oxygen Isotope to Carbonate Reservoirs in Northeast Sichuan Basin[J]. Acta Sedimentologica Sinica, 2011, 29(2): 217-225.
| Citation: |
CHEN Mei. Application of Carbon and Oxygen Isotope to Carbonate Reservoirs in Northeast Sichuan Basin[J]. Acta Sedimentologica Sinica, 2011, 29(2): 217-225.
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