Effect and quantitative evaluation of CO_2 derived from organic matter in coal on the formation of tight sandstone reservoirs

查看全文 作　　者：SHUAI [1]YanHua;ZHANG [1]ShuiChang;GAO [2]Yang;LU [3]Hong;CHEN [1]JianPing;MI [1]JingKui;LIU [3]JinZhong;HU [1]GuoYi

机构地区：[1]State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration & Development, PetroChina;[2]Research Institute of Geology, Shengli Oilfield;[3]State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》索引2013年第56卷第5期,共7页

基　　金：supported by National Natural Science Foundation of China (Grant No. 40873031);China Petroleum Foundation (Grant Nos. 2012Y-011, 2011B-0601);National Oil and Gas Special Foundation (Grant No. 2011ZX05007-001) 摘　　要：Tight reservoirs are widely distributed, especially in coal measure strata. Identification of the densification mechanism of the tight sandstone reservoirs is critical in effectively exploring and exploiting tight gas/oil resources. In this study, the gas formation from type Ⅲ organic matter in coal was kinetically modeled for the whole diagenetic stage, from the shallow buried biogas generation stage to the deep buried thermal gas generation stage. The results demonstrated that during hydrocarbon formation, quantities of non-hydrocarbon gases, such as CO2 , were generated. The proportion of CO2 is about 50%-70% of that of the C1-5 , which far exceeds the CO2 content (0-5%) in the natural gas in the sedimentary basins. Geological case study analysis showed that a considerable part of the 'lost' gaseous CO2 was converted into carbonate cement under favorable environments. Under the ideal conditions, the volume of the carbonate cement transformed from total CO 2 generated by 1 m 3 coal (Junggar Basin Jurassic, TOC 67%) can amount to 0.32 m 3 . Obviously, this process plays a very important role in the formation of tight sandstone reservoirs in the coal measures. Our results also show that the kinetic generation processes of C1-5 and CO2 are asynchronous. There are two main stages of CO2 generation, one at the weak diagenetic stage and the other at the over-mature stage, which are different from large-scale multi-stage hydrocarbon gas generation. Therefore, we can understand the mechanism of tight gas charging by determining the filling time for a tight gas reservoir and the key period of CO2 generation. Further analysis and correlation studies of a specific region are of great significance for determining the mechanism and modeling gas charging in tight reservoirs. It should be noted that the formation of tight sandstone reservoirs is the combined result of complex organic-inorganic and water-rock-hydrocarbon interactions. The details of spatial and temporal distributions of the carbonate cement derived from the organic CO2 , which combines with metal ions (Ca/Mg/Fe) in the formation water, should be further investigated. 关键词：致密砂岩储层二氧化碳煤炭定量评估有机物碳酸盐胶结物 CO2含量致密化机制

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Effect and quantitative evaluation of CO_2 derived from organic matter in coal on the formation of tight sandstone reservoirs

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