Reservoir diagenesis of 3rd member of Feixianguan Formation, Jiannan Gas Field
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摘要: 以建43井为例,研究了建南气田三叠系飞三段储层的成岩作用及特点,其中白云岩化作用、溶蚀作用和构造破裂作用对储层贡献较大。其成岩序列为藻粘结、泥晶化→一世代胶结→大气淡水溶蚀→二世代粒状胶结→新生变形→压实压溶→白云岩化→早期张裂缝及充填→构造挤压作用→埋藏溶蚀Ⅰ→进油→白云石、萤石充填、石英充填交代→油演化为沥青→埋藏溶蚀Ⅱ→晚期张裂缝→进气;主要经历了海底(潮间)环境、大气淡水环境、浅埋藏和深埋藏环境。白云石晶体、二世代粒状胶结物、萤石被溶蚀、压性裂缝发育以及孔隙无明显变形是埋藏溶蚀的主要识别标志。Abstract: Diagenesis and features of the 3rd member of Feixianguan Formation in the Jiannan Gas Field were studied taking well Jian43 as an example.Dolomitization,karstification and tectonic disruption were contributive to reservoir.Diagenesis sequence was illustrated as follows: algae agglutinate and micritization→first consolidation→atmospheric water erosion→secondary granular consolidation→neomorphism→compaction and pressolution→dolomitization→early tension fissure and filling→tectonic compression→buried erosion Ⅰ→petroleum entering→dolomite and fluorite filling as well as quartz filling and metasomatism→oil evolving to bitumen→buried erosion Ⅱ→late tension fissure→gas entering.There were 4 kinds of diagenesis environment including seabed (intertidal),atmospheric water,shallow bury and deep bury.Dolomite crystals,secondary granular consolidations,eroded fluorites,tensional fissures and pores without obvious deformation were the main identifications for buried erosions.
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