川东三叠系飞仙关组碳酸盐岩的阴极发光特征与成岩作用

黄思静; 卿海若; 胡作维; 裴昌蓉; 王庆东; 王春梅; 郜晓勇

Volume 33 Issue 1

Jan. 2008

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Article Navigation > Earth Science > 2008 > 33(1): 26-34

HUANG Si-jing, QING Hai-ruo, HU Zuo-wei, PEI Chang-rong, WANG Qing-dong, WANG Chun-mei, GAO Xiao-yong, 2008. Cathodoluminescence and Diagenesis of the Carbonate Rocks in Feixianguan Formation of Triassic, Eastern Sichuan Basin of China. Earth Science, 33(1): 26-34.

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Cathodoluminescence and Diagenesis of the Carbonate Rocks in Feixianguan Formation of Triassic, Eastern Sichuan Basin of China

1.
State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
2.
Department of Geology, University of Regina, Regina SK S4S 0A2, Canada

Received Date: 2007-02-18
Publish Date: 2008-02-25

Abstract

Abstract

The Feixianguan carbonates of Triassic in Eastern Sichuan basin are the most important gas reservoir of China, and the reservoir with higher porosity and permeability is all dolomites, so the diagenesis, specially origin of dolomites is drawing increasing attention of petroleum geologists and sedmentologists. 42 carbonate samples, from Feixianguan Formation, Luojiazhai Gas Field of Eastern Sichuan basin, were studied by cathodoluminoscope. The results, together with the petrology analysis and Mn, Fe, Mg element tests, show that the carbonate rocks in Feixianguan Formation of Triassic, Eastern Sichuan basin of China generally have dull cathodoluminescence, which results from very low Mn and Fe contents, suggesting the limited influence of non-marine fluid during post-sedimentation. The diagenesis of the carbonates should have been governed by some kinds of marine fluid. However, the limestones and dolomites with different structures also display various cathodoluminescent intensities. The carbonates with more diagenetic components luminesce duller, in other words, the carbonates influenced by more post-sedimentary fluids (mainly pore waters) luminesce dull, suggesting the enhancement of marine fluid effect with the process of burial diagenesis. The cathodoluminescence of crystalline dolomite, which is the most important gas reservoir, reflects the deep burial conditions of diagenetic fluids that have not circulated through clastic rocks within the basin, but through some marine beds such as thick evaporates which are widely distributed in the Triassic of Sichuan basin. The dissolution or dehydration of evaporates provided the marine fluid that participated in the dolomitization of crystalline dolomite.
- eastern Sichuan basin,
- Feixianguan Formation of Triassic,
- carbonate rock,
- cathodoluminescence,
- diagenesis fluid

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References(42)

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