中石化无锡石油地质研究所,中石化无锡石油地质研究所,中石化无锡石油地质研究所,中石化无锡石油地质研究所,中石化无锡石油地质研究所
中国石油化工股份有限公司科技攻关项目
XI Binbin
1) Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu, 214151;2) SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu, 214151;3) State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu, 214151; 4) State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu, 214151YU Xiaolu
1) Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu, 214151;2) SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu, 214151;3) State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu, 214151; 4) State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu, 214151WANG Jie
1) Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu, 214151;2) SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu, 214151;3) State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu, 214151; 4) State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu, 214151JIANG Hong
1) Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu, 214151;2) SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu, 214151;3) State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu, 214151; 4) State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu, 214151ZHANG Jun
1) Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu, 214151;2) SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu, 214151;3) State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu, 214151; 4) State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu, 214151Wuxi Institute of Petroleum Geology，SINOPEC,Wuxi Institute of Petroleum Geology，SINOPEC,Wuxi Research Institute of Petroleum Geology,Wuxi Research Institute of Petroleum Geology,Wuxi Research Institute of Petroleum Geology
川东北元坝气田是中国南方大型油气田之一，通过对元坝224井上二叠统储层溶洞石英及白云石中包裹体的岩相学、激光拉曼以及显微测温分析发现，溶洞石英中包裹体类型复杂，主要由气液两相包裹体、气体包裹体以及含子矿物包裹体组成，包裹体的气相组分主要由CH4、H2S以及CO2组成，包裹体的子矿物为单质硫以及沥青，包裹体共生组合关系复杂，不同类型包裹体常叠加在一起，气液两相包裹体均一温度以及含单质硫三相包裹体的气液均一温度范围相似，分别为161.5~220.6℃以及168.2~218.6℃，二者的盐度分布范围差别较大，分别为7.45%~10.36%NaCl以及8.68%~21.11%NaCl；溶洞白云石中包裹体类型单一，由气液两相包裹体组成，个别包裹体的气相中含有CH4，包裹体的均一温度为102.4~132.1℃。包裹体的古温度古压力分析表明，溶洞石英中包裹体捕获于中—晚侏罗世，包裹体捕获时地层流体为超压，捕获于原油大量裂解生成天然气阶段。溶洞石英中不同类型包裹体的组合关系以及温压特征记录了储层中TSR反应的过程，即硫酸盐先与重烃反应生成H2S以及单质硫，然后硫酸盐以及生成的单质S再与CH4继续反应生成H2S以及CO2，随着TSR反应的进行，储层中的压力逐渐增大。TSR反应生成的H2S以及CO2流体可能与储层发生了较强烈的水岩反应，造成了储层的硅化以及溶洞中石英、白云石的沉淀。
The Yuanba gas field of northeastern Sichuan is one of the large gas fields in South China. This study analyzed the characters of fluid inclusions in quartz and dolomite cement in dissolution pores in the Upper Triassic reservoirs, using fluid inclusion petrography, microthermometry and Raman analysis. The types and assemblage of fluid inclusions in quartz cements are complex. Inclusion types include: twophase aqueous inclusions, singlephase gas inclusions, and daughter mineralsbearing inclusions. The composition of gas phase in these inclusions is CH4, ±H2S and ±CO2 and the composition of minerals is native sulfur and bitumen. The homogenization temperatures (161.5~220.6℃) of two phase aqueous inclusions and the gas to liquid homogenization temperatures (168.2~218.6℃) of sulfur bearing three phase inclusion are similar, but the salinities (7.45%~10.36%NaCl and 8.68%~21.11%NaCl) of these two kinds of inclusions are different. Only twophase aqueous inclusions were discovered in dolomite cement, with individuals to host CH4 uncommonly in gas bubble, and the homogenization temperature of this kind of inclusions ranging between 102.4~132.1℃. The paleopressure and paleotemperature analysis indicates that the fluid inclusions in quartz cements were trapped at the stage of natural gas generation due to large scale pyrolysis of crude oil in an overpressure fluid environment during the MidLate Jurassic. The assemblage of different types of fluid inclusions and the characters of trap temperature and trap pressure record the reaction process of Thermochemical Sulphate Reduction (TSR). Firstly the heavy hydrocarbons are deoxidize sulfate to H2S and S, then the CH4 and S are deoxidize to H2S and CO2. During this process, the pressure gradually increased. H2S and CO2 produced by the TSR reaction may cause waterrock reaction with dolomite rock, resulting in silicification of dolomite rock and the precipitation of quartz and dolomite cement in dissolution pores.
席斌斌,余晓露,王杰,蒋宏,张隽.2017.川东北元坝地区储层溶洞石英及白云石胶结物中包裹体特征及意义[J].地质学报,91(9):2091-2104.
XI Binbin, YU Xiaolu, WANG Jie, JIANG Hong, ZHANG Jun.2017. Character of Fluid Inclusions in Quartz and Dolomite Cements of the Yuanba Gas Reservoir, NE Sichuan, China and Its Geological Significance[J]. Acta Geologica Sinica,91(9):2091-2104.
