Abstract
为了揭示川中地区龙王庙组颗粒滩的沉积环境，利用钻井岩心及薄片资料，开展了定性及定量的碳酸盐岩微相分析。研究表明，龙王庙组颗粒滩发育4种微相类型：砾屑云岩微相(MF1)、砂屑云岩(残余砂屑结构的细粉晶云岩)微相(MF2)、鲕粒云岩微相(MF3)和(黏结状)球粒云岩微相(MF4)。结合颗粒云岩的粒度分析表明，砂屑云岩(残余砂屑结构的细粉晶云岩)微相(MF2)和鲕粒云岩微相(MF3)沉积环境位于浅缓坡(内缓坡高能带)；砾屑云岩微相(MF1)代表着中缓坡带的风暴作用再沉积；(黏结状)球粒云岩微相(MF4)为低能滩，发育于中缓坡低能带和内缓坡的低能洼地或潟湖。 In order to reveal the depositional environment of the sand shoal of the Longwangmiang Formation, we made an integrated microfacies analysis in both qualitative and quantitative aspects by using core and thin section data of the Longwangmiao Formation in central Sichuan Basin. The result shows that four types of microfacies can be recognized which are dolorudstones (MF1), intraclasts dolograinstone (fine and silt-size crystalline dolomite with sandy structure ghost) (MF2), ooid dolograinstone (MF3), and dolopackstone (with binding structure) (MF4). Combining with the quantitative analysis of graindolomite, the carbonate sands and ooids (MF2-3) were products of a shallow ramp (inner ramp with high energy). MF1 represents redeposition induced by storm wave occurred in a middle ramp. MF4, representing low-energy shoal, was generated in the low- energy middle ramp and in the sag or lagoon that were barricaded by inner-ramp shoals.
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