CAJ | 학술논문

运用铸体薄片、扫描电镜、岩心化验等微观分析方法对大湾地区飞仙关组储层的成岩作用和孔隙演化特征进行研究。结果表明飞仙关组碳酸盐岩储层主要成岩作用为：白云化、压实压溶、方解石胶结、多期溶蚀、充填、重结晶作用等。根据成岩特征综合分析，储集岩主要形成于波浪沙作用比较强的台地边缘鲕粒滩沉积相带中，以鲕粒细晶白云岩、砂屑细晶白云岩为主，颗粒直径大，白云岩化程度高，分选为好-中等，但成岩作用强烈。在海底-同生暴露阶段，压实及方解石胶结作用使储层孔隙度急剧下降。该过程中，虽有混合水白云化和大气淡水溶蚀作用形成次生孔隙，但原生孔隙大量减少；浅埋藏阶段，在压实和胶结作用的影响下，孔隙度快速降低；后期溶蚀作用可以形成次生溶孔，对岩石孔隙度的增加具有相当大的贡献。
운용주체박편、소묘전경、암심화험등미관분석방법대대만지구비선관조저층적성암작용화공극연화특정진행연구。결과표명비선관조탄산염암저층주요성암작용위：백운화、압실압용、방해석효결、다기용식、충전、중결정작용등。근거성암특정종합분석，저집암주요형성우파랑사작용비교강적태지변연이립탄침적상대중，이이립세정백운암、사설세정백운암위주，과립직경대，백운암화정도고，분선위호-중등，단성암작용강렬。재해저-동생폭로계단，압실급방해석효결작용사저층공극도급극하강。해과정중，수유혼합수백운화화대기담수용식작용형성차생공극，단원생공극대량감소；천매장계단，재압실화효결작용적영향하，공극도쾌속강저；후기용식작용가이형성차생용공，대암석공극도적증가구유상당대적공헌。
Diagenesis and pore evolution characteristics of Feixianguan Formation in Dawan gas reservoir were fully studied based on the microscopic-analysis on casting thin sections, scanning electricity mirror, and core analyzing materials. The results showed that the mainly diagenesis types of carbonate reservoir in this area were dolomitization, compaction, cemented, filling, dissolution, recrystallization diagenesis, etc. In submarine and syngenetic stage, porosity dropped rapidly because of compaction and the calcite cementation. During this stage, the primary pores reduced greatly, despite mixed water dolomitization and meteoric fresh water dissolution formed secondary pores. In shallow burial stage, the pores drastically reduced under the condition of compaction and cementation. The later period of dissolution can form secondary dissolution pore, thus largely contributed to the increase of porosity.