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TSR-Derived Authigenic Calcites in Triassic Dolomite,NE Sichuan Basin,China-A Case Study of Well HB-1 and Well L-2

Journal of Earth Science 2012年第1期23卷 88-96页

作者： Sijing Huang Keke Huang Zhiming Li Ming Fan Ershe Xu Jie Lü State Key Laboratory of Oil/Gas reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China Wuxi Research Institute of Petroleum Geology SINOPECWuxi 214151China

It has been proven that thermochemical sulfate reduction （TSR） took place extensively in the Lower Triassic carbonate reservoirs in Northeast （NE） Sichuan （四川） basin. We have carried out analyses on bulk rock compositions and isotope ratios together with petrography and fluid inclusions to assess the impact of TSR on diagenetic process of Triassic dolomites. In this article, TSR-related burial diagenesis is characterized by precipitation of calcite cement with negative 613C values and high ho- mogenization temperature. The light carbon isotopic compositions of this phase indicate that carbon incorporated in this cement was partly derived from oxidation of hydrocarbon. The high homogeniza- tion temperatures indicate that the thermochemical reduction of sulfates has been taking place in the deep part of NE Sichuan basin. Additional evidence supporting this interpretation is the high Sr values of this calcite cement. Moreover, the calcites have a 6180 of -8.51%o to -2.79%0 PDB and are interpreted to have precipitated from high salinity fluids with 6180 of ＋5%0 to ＋13%o SMOW. Under cathodolumi- nescence, these calcite cements appear dark brown or black, and both Mg concentrations and Mn/Sr ratios are low. It is therefore indicated that seawater was the principal agent of precipitation fluids. Finally, it should be noted that although H2S and CO2 increased as TSR continued, porosity has been ultimately destroyed by calcite cementation.

关键词： NE Sichuan basin Triassic TSR,calcite cementation reservoir quality.

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